unit1 Materials Science and Engineering.ppt

Material Science and engineering Text Organization Part 1: Introduction Part 2: What are Material Science and Engineering? According to the content, this text mainly contains the following two parts: Part 1: Introduction The development of materials in society. The Relationship between Technology and Materials The importance of materials in society. Para1 Para2 Para3 Materials are properly more deep-seated in our culture ... ….－virtually every segment of our everyday lives is influenced to one degree or another by materials. Historically, the development and advancement of societies have been intimately tied to the members’ abilities to produce and manipulate materials…. In fact, early civilizations have been designated by the level of their materials development (i.e. Stone Age, Bronze Age) Part 1: Introduction Para 1: The importance of materials in society. adj.根深蒂固的, 深层的 adv.不同程度地 与...紧密联系 指定，命名 The earliest humans has access to only a very limited number of materials, those that occur naturally ... With time they discovered techniques for producing materials that had properties superior to those of the natural ones…… Furthermore, it was discovered that the properties of a material could be altered by heat treatments and by the addition of other substances. Part 1: Introduction Para 2: The development of materials in society. 有权使用 比…更好 性质 At this point, materials utilization 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 its characteristic. at this point 在这一点上, 此时 materials utilization 材料的利用 that is，即, 就是, 换句话说, 就是说 by virtue of 依靠，由于，因为 characteristic n，特性、特征 此时，材料的利用完全是一种选择的过程，即从特定有限的一组材料中根据特性确定最合适的一种 It was not until relatively recent times that scientists came to understand the relationships between the structural elements of materials and their properties. (P4) This knowledge, … has empowered them to fashion, to a large d