What is Materials Science and Engineering? Performance or Properties to Cost Ratio Synthesis and Composition Processing Macro-Seale Structure Engine Block ≡upto1 meter Performance Criteria ·Power generated Micrastructure .Efficiency Grains Cnit Cell Durability 兰1-10 millimeters 5m -Cost Properties affected Microstructure ·High cycle fatigue -Dendrites Phases ·Ductility =50-500 micrometers Nano-structure Properiies affected -Precipitates Essentials of Materials ·Yield strength 兰3-100 nanometers 50 Ultimate tensile strength Science and Engineering ·High cycle fatigue ·Low cyele fatigue Properties affected ·Thermal Growth ·Yield strength Atomie-seale structure DonaldR.Askeland Ductility Ultimate tensile strength =1-100 Angstroms ·Low cycle fatigue Property affected Pradeep P.Phule Ductility .Young's modulus .Thermal Growth A real-world example of important microstructural features at different length-scales,resulting from the sophisticated synthesis and processing used,and the properties they influence.The atomic,nano,micro,and macro-scale structures of cast aluminum alloys(for engine blocks)in relation to the properties affected and performance are shown.The materials science and engineering (MSE)tetrahedron that represents this approach is shown in the upper right corner. (Illustrations Courtesy of John Allison and William Donlon,Ford Motor Company). Ⅰ— 工程材料 Ⅱ— 机械制造技术 Ⅲ— 公差与配合 从机械工程的应用角度出发，阐明机械工程材料的 基本理论，了解材料的成分、工艺、组织与性能之间的 关系，介绍常用机械工程材料及其应用等基础知识。 在掌握机械工程材料的基本理论及基础知识的基础 上，具备根据机械零件使用条件和性能要求，对结构零 件进行合理选材及制订零件工艺路线的初步能力。 工程材料 课程任务(理论知识) 课程目的(应用能力) 00 课程概述 Essentials of Materials Science and Engineering Donald R. Askeland Pradeep P. Phulé