表面处理对近片层γ-TiAl合金拉伸性能的影响  

Effect of Surface Treatment on Tensile Property of A Near Lamellar Gamma-based TiAl-alloy

作　　者：杨镇骏 孙红亮[1] 黄泽文[1] 朱德贵[1] 王良辉[1] 

机构地区：[1]西南交通大学材料先进技术教育部重点实验室,成都610031

出　　处：《材料研究学报》2016年第1期75-80,共6页Chinese Journal of Materials Research

基　　金：国家自然科学基金51201141;中央高校基本科研业务费2682014CX005资助项目~~

摘　　要：研究了表面处理对近片层γ-Ti Al合金Ti-45Al-5Nb-1W-1B(原子分数,%)拉伸性能的影响。研究表明:喷丸试样在室温和高温下都具有最高的抗拉强度,车削加工试样的室温抗拉强度与喷丸试样接近,但是高温抗拉强度明显降低。电解抛光试样的室温抗拉强度最低,但是高温抗拉强度与喷丸试样类似,都显著提高。喷丸和车削加工试样都出现一个压应力区,但是喷丸还出现一个大约300μm厚的变形区,其压应力明显比车削加工试样的大,同时压应力的引入使裂纹萌生的位置也发生了变化。Effect of surface treatment on tensile property of a near lamellar gamma-based TiAl-alloy Ti- 45Al- 5Nb- 1W- 1B（atom fraction, %） has been investigated. The results show that the highest tensile strength of the alloy at room temperature and high temperature can be achieved by shot peening. The alloy processed by turning possesses a tensile strength close to that of shot penned one at room temperature, however a dramatic decline at high temperature. Electro polishing leads to the lowest tensile strength at room temperature, but a tensile strength at high temperature as high as that of shot penned one. Although the residual compressive stress can be introduced by shot peening and turning, besides a surface layer of deformation can also be caused by the former, therefore the compressive residual stress induced by shot penning is higher than that by turning. Meanwhile, crack initiation has been transferred from surface to subsurface because of the existence of the residual compressive stress.

关 键 词：金属材料 结构材料 抗拉强度 表面处理 γ-Ti AL合金 

分 类 号：TG146[一般工业技术—材料科学与工程]