無機非金屬材料工程專業(yè)英語-第1章課件

1、Chapter1 IntroductionLearning Objectives 21.1 Historical Perspective 21.2 Materials Science and Engineering 21.3 Why Study Materials Science and Engineering? 41.4 Classification of Materials 51.5 Advanced Materials 61.6 Modern Materials Needs 6精選Chapter1 IntroductionLearning漢語翻譯成英文材料科學材料工程金屬材料非金屬材料陶

2、瓷材料高分子材料復合材料生物材料半導體材料先進材料精選漢語翻譯成英文材料科學精選Words and phrasesDeep-seated: close/intimate 緊密的Virtually: practically/in fact/nearly/as good as/in effect/in essence實際上地Every segment of our everyday lives:日常生活的每個方面Segment: section/division/part/piece部分、片 Manipulate: control/employ控制、使用精選Words and phrasesDee

3、p-seated: Designate: define/denote/label/ name 標記、命名Access to): approach 途徑Pottery: pots/dishes or other items made from clay and fired in a kiln (oven) 陶器Alter: change 改變Utilization: application /use 應(yīng)用、 用途Empower: control 駕馭、控制精選Designate: define/denote/labelWords and phrasesCharacteristic: peculi

4、arity, feature/trait/attribute/property特質(zhì)Evolve: produce 生產(chǎn)Complex: sophisticated 復雜的Contemporary：Someone who lived or was in a particular place at the same time as someone else. Modern/belonging to the present time 同時代的Nebulous: vague. An idea that is nebulous is not at all clear or exact. 模棱兩可的精選W

5、ords and phrasesCharacteristiRelated to: be concerned with 相關(guān)的Encompass：to completely cover or surround sth.覆蓋或環(huán)繞Realm：territroy/monarchy/ zone/domain/region /kingdom/area/branch 區(qū)域Agglomerate：melt 團聚、成塊-volcanic rock consisting of large fragments fused together精選Related to: be concerned with Vocabu

6、laryContemporary 當代Stimulus 激勵，刺激Opaque 不透明 Translucent 半透明Transparent 透明Deep-seated 根深蒂固的，深層的Existence 存在, 實在, 生活, 存在物, 實在物Sophisticated 復雜的Forerunner 先驅(qū)(者), 傳令官, 預兆Intimately 密切地精選VocabularyContemporary 當代精選Elaboration 解釋，闡述Stepwise樓梯式的, 逐步的Recreation 消遣, 娛樂segment段, 節(jié), 片斷Deteriorative 惡化，變質(zhì)， 精選El

7、aboration 解釋，闡述精選Evoke 引起，喚起Interdisciplinary 交叉學科Metallurgy 冶金Nebulous 模糊的，云霧狀的Agglomerate 團聚，大塊Dielectric current 介電常數(shù)Thermal conductivity 熱傳導精選Evoke 引起，喚起精選Heat capacity 熱容Refraction 折射，衍射Ductility 延展性O(shè)verriding 最重要的Prohibitive 抑制Judicious 明智的criterion 準則精選Heat capacity 熱容精選1.1 Historical perspec

8、tive (觀察，透視) Materials are probably more deep-seated (根深蒂固的, 深層的) in our culture than most of us realize. Transportation, housing, clothing, communication, recreation（娛樂）, and food productionvirtually（事實上） every segment （方面）of our everyday lives is influenced to one degree or another（不同程度地） by mater

9、ials. 精選1.1 Historical perspective (觀察Historically, the development and advancement of societies have been intimately（密切地） tied to the members ability to produce and manipulate （使用）materials to fill their needs. In fact, early civilizations have been designated（命名） by the level of their materials de

10、velopment (i.e., Stone Age, Bronze Age, Iron Age).精選Historically, the development Stone ageiron ageSteel ageAdvanced materials agebronze age精選Stone ageiron ageSteel ageAdva The earliest humans had access to only a very limited number of materials, those that occur naturally: stone, wood, clay（粘土）, s

11、kins, and so on. With time they discovered techniques for producing materials that had properties superior to those of the natural ones; these new materials included pottery （陶器） and various metals. 精選 The earliest humans had accesFurthermore, it was discovered that the properties of a material coul

12、d be altered （改變）by heat treatments and by the addition of other substances. At this point, materials utilization（利用） was totally a selection process, that is, deciding from a given, rather limited set of materials the one that was best suited for an application by virtue of （憑借）its characteristics（

13、特性）.精選Furthermore, it was discoveredIt was not until relatively recent times that scientist came to understand the relationship between structural elements of materials and their properties. This knowledge, acquired in the past 60 years or so, has empowered （使能夠） them to fashion(shape ), to a large

14、degree（非常）, the characteristics of materials. 精選It was not until relatively reThus, tens of thousands of different materials have evolved （出現(xiàn)）with rather specialized characteristics that meet the needs of our modern and complex society. These include metals, plastics, glasses, and fibers.精選Thus, ten

15、s of thousands of difThe ugly bowl and the beautiful cup are different in appearance, but do you know the bowl is the ancestor of the cup if trace back to 7000 years ago?porcelainceramics精選The ugly bowl and the beautifu The development of many technologies that make our existence so comfortable has

16、been intimately associated with the accessibility (途徑) of suitable materials. An advancement in the understanding of a material type is often the forerunner（先驅(qū)） to the stepwise （逐步的） progression of a technology. 精選 The development of many technFor example, automobiles would not have been possible wi

17、thout the availability （利用）of inexpensive steel or some other comparable substitute. In our contemporary (同時代的) era, sophisticated （復雜的）electronic devices rely on components that are made from what are called semi-conducting （半導體的） materials.精選For example, automobiles wouldMaterials scientists and e

18、ngineers seek （try, investigate尋求）to understand and control the basic structure of materials in order to make the products stronger, lighter, brighter, safer, faster and better suited (adapt, fit )to (適合) human needs. Every part in your car and every piece of your computer are carefully selected to

19、optimize (優(yōu)化) performance and cost effectiveness.3.Task for Materials scientists and engineers精選Materials scientists and engin4.Materials Science and Engineering (MSE) discipline The discipline of materials science involves investigating the relationships that exist between the structures and proper

20、ties of materials. In contrast, materials engineering is, on the basis of these structureproperty correlations, designing or engineering the structure of a material to produce a predetermined (預定的) set of properties. Throughout this text we draw attention to the relationships between material proper

21、ties and structural elements.精選4.Materials Science and EngineStructure is at this point a nebulous（模糊的） term that deserves some explanation. In brief, the structure of a material usually relates to the arrangement of its internal components. Subatomic structure involves electrons within the individu

22、al atoms and interactions with their nuclei(原子核). On an atomic level, structure encompasses (包含) the organization of atoms or molecules relative to one another. 精選Structure is at this pointThe next larger structural realm (區(qū)域), which contains large groups of atoms that are normally agglomerated (團聚)

23、 together, is termed microscopic, meaning that which is subject to direct observation using some type of microscope. Finally, structural elements that may be viewed with the naked eye are termed macroscopic.精選The next larger structural reaThe notion of property deserves elaboration. While in service

24、 use, all materials are exposed to external stimuli （刺激） that evoke（喚起） some type of response. For example, a specimen subjected to forces will experience deformation; or a polished metal surface will reflect light. Property is a material trait（特性） in terms of the kind and magnitude of response to a

25、 specific imposed （施加的）stimulus （刺激）. Generally, definitions of properties are made independent of （與無關(guān)）material shape and size.精選The notion of property desVirtually all important properties of solid materials may be grouped into six different categories: mechanical, electrical, thermal, magnetic, o

26、ptical, and deteriorative. For each there is a characteristic type of stimulus capable of provoking (evoke) different responses. Mechanical properties relate deformation to an applied load or force; examples include elastic modulus (彈性模量) and strength.精選Virtually all important proper For electrical

27、properties, such as electrical conductivity （電導率）and dielectric constant（介電場數(shù)）, the stimulus is an electric field（電場）.The thermal（熱的） behavior of solids can be represented in terms of heat capacity （熱容） and thermal conductivity（熱導率）. 精選 For electrical properties, suMagnetic（磁性的） properties demonstra

28、te the response of a material to the application of a magnetic field （磁場）.For optical（光學的） properties, the stimulus is electromagnetic （電磁的）or light radiation（光輻射）; index of refraction（折射） and reflectivity （反射）are representative optical properties. Finally, deteriorative（腐敗的） characteristics indicat

29、e the chemical reactivity（化學反應(yīng)） of materials. The chapters that follow discuss properties that fall within each of these six classifications.精選Magnetic（磁性的） properties demon In addition to structure and properties, two other important components are involved in the science and engineering of materia

30、ls, viz (namely, that is). processing (加工) and performance（性能）. With regard to the relationships of these four components, the structure of a material will depend on how it is processed. Furthermore, a materials performance will be a function of its properties. Thus, the interrelationship between pr

31、ocessing, structure, properties, and performance is linear, as depicted in the schematic illustration shown in Figure 1.1. 精選 In addition to structThroughout this text we draw attention to the relationships among these four components in terms of the design, production, and utilization of materials.

32、Materials Science and Engineering (MSE) is the discipline(學科) devoted to (專心于) helping human beings use materials more effectively(有力的) and efficiently (有效的). The story of materials is an ancient one that began with humanity learning to shape（成形） rock and work metal. From the prehistoric beginning,

33、the story of human advances in materials continues to unfold (展開).精選Throughout this text we draw aFor example, the development of steels permitted the building of skyscrapers and suspension bridges; advances in silicon based technology provided the foundation for electronics and computers,New biomat

34、erials have resulted in medical breakthroughs that save and improve lives. Materials scientists and engineers focus on the manipulation of atomic scale structure to change materials properties精選For example, the development oThis focus has pushed our discipline to the forefront（最前沿） of developing and

35、 applying new tools to observe and manipulate matter at the smallest scales. These advances continue to play an important part in the emergence of fields such as nanotechnology at the beginning of the 21st century. 精選This focus has pushed our disc5 The future of humanity depends on our wise use of m

36、aterialsMost of the technological innovations that we associate with contemporary（現(xiàn)代） life have involved some major advance in materials processing or application. 精選5 The future of humanity depenAutomobiles, satellites, televisions, computers and DVD players all would not be possible without advanc

37、es in polymers, ceramics, metals and semiconductors. New advances are being pioneered in our laboratories. 精選Automobiles, satellites, televThe direct threat of global warming and dwindling(縮小)fossil fuel resources have made the efficient use of energy a priority(優(yōu)先). MSE faculty and students work ac

38、tively to make light-weight engine components out of aluminum and magnesium in order to boost(促進,增強) fuel efficiency. They also pioneer improved high-temperature materials that are important for efficient jet engines and electricity generation. 精選The direct threat of global waTo restore hearing to d

39、eaf people and sight to blind people prosthetic devices must make contact between the brain and a microphone or camera. MSE faculty and students work to find ways to Interface（ 界面）silicon technology to neural tissue（神經(jīng)組織）. This requires the development of coatings that are biocompatible (生物相容的) and

40、electrically conducting.精選To restore hearing to deaf peoMoores law states that the number of transistors（晶體管） on the latest computer chip doubles approximately every 18 months. This translates into more memory and faster, cheaper computers. But there is a limit to the density of transistors that can

41、 be placed on a computer chip using current technology. 精選Moores law states that the nuMSE faculty and students develop methods to spontaneously（自發(fā)）generate structures a few tens to hundreds of atoms across to form the basis for quantum （量子）computers. These next generation computers will exploit the

42、 physics of quantum confinement （量子陷阱） that dominate at that tiny scale. 精選MSE faculty and students Making components out of new materials often involves an extensive cycle of design, creation, testing and redesign. This process is costly and time consuming. MSE faculty and students develop computer

43、 simulation techniques to predict material behavior such as resistance to failure, stability, and high temperature formability. These computing advances speed the way toward the introduction of new materials in a safe and cost-effective manner. 精選Making components out of nBuilding on a solid foundat

44、ion and bridging many fields精選Building on a solid foundation Course work in the MSE department emphasizes the relationship between how a material is processed, its structure and the resulting properties and is built on a firm grounding in physics and chemistry. Hands-on learning and access to sophis

45、ticated instrumentation allow students to gain valuable experience in characterizing materials structure and properties.（you can be a police using SEM or TEM） 精選 Course work in the Because materials enable new products and technologies, it is nearly impossible to find an engineering discipline that

46、does not interface in some way with Materials Science and Engineering. This is especially true for mechanical, aerospace, electrical, chemical and biomedical engineering where dual majors are often pursued. 精選Because materials enable new p1.2 Materials science and engineering1. Terms of definition M

47、aterials Science: investigating the relationships that exist between the structures and properties of materials.Materials Engineering: on the basis of structure property correlations, designing or engineering the structure of a material to produce a predetermined set of properties.精選1.2 Materials sc

48、ience and engStructure: A nebulous(模糊） term; In brief, the arrangement of its internal componentsSubatomic structure-involves electrons within the individual atoms and interactions with their nucleiAt atomic level-structure encompasses the organization of atoms or molecules relative to one another.m

49、icroscopic (顯微)a large group of atoms agglomerated together.Macroscopic (宏觀) where the structure elements might be viewed by naked eye. 精選Structure: microscopic (顯微)aproperty: 1.a material trait (特性) in terms of the kind and magnitude of response to a specific imposed stimulus。Examples:A loaded stee

50、l bar will be deformedA heated plastic plate will be softened A polished metal surface will reflect light精選property: 精選1.Mechanical2.electrical 3.thermal 4. Magnetic5.optical 6.deteriorative(變質(zhì)，化學) a elastic modulusb. index of refractionc. strengthd. reflectivitye. thermal conductivityf. heat capaci

51、tyg. electrical conductivityh. plasticityI. electromagneticj. light radiationchemical reactivityDielectric constantVirtually all important properties of solid materials may be grouped into six different property:精選1.Mechanicala elastic modulIn addition to structure and properties, processing and per

52、formance are another two important components for MSE. Four components that are involved in the design, production and utilization of materialsprocessing structure properties performance精選In addition to structure and pThree thin aluminum disk specimens placed over printed matter, from left to right

53、they are transparent, translucent and opaque, why? Because they are processed differently , then have different structure; different structure leads to different properties and if they are put into use, the performance must be different too.精選Three thin aluminum disk speci1.3 Why study Materials sci

54、ence and engineering? Many an applied scientist or engineer will at one time or another，whether mechanical, civil (土木), chemical, or electrical, be exposed to a design problem involving materials. Examples might include a transmission gear (傳動齒輪), the superstructure for a building, an oil refinery (

55、煉油廠) component, or an integrated circuit chip (集成電路板). Of course, materials scientists and engineers are such specialist who are totally involved in the investigation and design of materials. For them try to selection proper materials to fulfill specific purpose is not easy. 精選1.3 Why study Materials sciencThree criteria that are important in the materials selection purpose:1. In-service conditions must be cha