喷丸处理对TiB2／Al复合材料表面基体力学性能的影响  

Influence of shot blasting on matrix mechanical properties of the surface on TiB_2/Al composite

作　　者：栾卫志[1] 姜传海[1] 嵇宁 

机构地区：[1]上海交通大学材料科学与工程学院,上海200240 [2]LEMHE/ICMMO,UMR 8182,Universite Paris-Sud 11,91405 Orsay France

出　　处：《材料研究学报》2009年第3期237-241,共5页Chinese Journal of Materials Research

基　　金：国家自然科学基金50771066;白玉兰科技人才基金2007B071资助项目~~

摘　　要：通过X射线衍射线形分析表征了喷丸表面的组织结构,利用原位拉伸X射线衍射应力分析研究了TiB_2/6351Al复合材料喷丸表面基体的力学行为。结果表明,喷丸后复合材料表面基体的屈服强度提高了26%,整体强度提高约28%,显微硬度提高50%以上。喷丸前、后复合材料基体承载系数分别为81%和83%,喷丸后的基体承载系数略有提高。喷丸表面基体的晶块尺寸及位错密度分别约51 nm和3.05×10^(14)m^(-2),晶块细化及位错密度增高是导致表面基体力学性能提高的主要原因。The microstructures were determined by X-ray diffraction line profile analysis. The influence of shot blasting on the matrix mechanical properties of the surface on TiB2/6351Al was investigated by using in situ tension X-ray diffraction technique. Results show that the proof stress of the matrix in the shot blasted surface had been increased by about 26% and the integral strength had been increased by 28%. Moreover, the increment of hardness is more than 50%. The bearing stress factor of the matrix of untreated and shot peened surface is 81% and 83%, respectively. The domain size and the dislocation density of the strengthened surface are 51 nm and 3.05× 10^14m^-2. The increment of mechanical properties is mainly due to the fine domain and high value of dislocation density introduced by shot blasting.

关 键 词：复合材料 喷丸强化 基体性能 X射线衍射 金属基复合材料 组织结构 

分 类 号：TG115[金属学及工艺—物理冶金]