Presents the microstructure evolution in aluminum a nd copper after deformation by cold rolling in the strain range of 10 to 50 % red uction using tem and points out three types of dislocation structures are typica l and two of them are common for both materials and these two common types are f ound in non - cube grains and can be distinguished by crystallographic orientatio n of dislocation boundaries in the grains and the third type of structure is obs erved in cube grains , and concludes that grain orientation is important in deter mining the structure type but some other metallurgical parameters also have a ro le to play 采用tem对冷轧多晶铜与多晶铝的形变显微组织演变进行了对比研究.结果发现：多晶铜及多晶铝形变显微组织中均含有三类典型的位错结构类型，其中的两种结构特征在两种材料中是相似的，这两种类型结构存在于非立方取向晶粒，可通过晶粒中位错边界的晶体学取向加以区别，另一类型结构存在于立方取向晶粒；晶粒的晶体学取向决定了其形变显微组织类型，但其它冶金学因素对显微组织也有影响
In order to promote effectively diathesis development plan and bilingual education , celebrate the tenth anniversary of material and metallurgy , activate the campus cultural atmosphere , enthuse the students over oral english and demonstrate the real charm of oral english , the students union of the youth league committee of material and metallurgy college held english movie imitating show final contest on november 20th 为促进素质拓展计划的有效开展和学院“双语”教育的顺利进行，庆祝材冶学院十周年院庆，活跃校园的文化氛围，激发同学们对英语口语的热情，展示英语口语的真实魅力，为广大同学提供一个广阔的展现舞台，材料与冶金学院团委学生会于11月20日晚6 : 30在冶金馆210室举办双语嘉年华系列活动之英文电影模仿秀决赛。
Through analyzing the surface microstructure of counter - cavitational material and the factors of affecting cavitation , on the basis of material mechanical properties , metallurgical parameters and fluid mechanical conditions , the paper presents cavitation erosion mechanism in multitude fluid medium , whereby offers references for calculating erosion rate 通过对抗气蚀材料表面显微结构和影响气蚀因素的分析，从材料的机械性能、冶金学参数和流体力学条件出发，综述多项流体介质作用下气蚀磨蚀的机理，从而为计算气蚀磨蚀速率提供参考
