Effects of sintering temperature and time on defect evolution and compression properties of Ti-Al_(3)Ti laminated composites  

作　　者：Meini YUAN Zhijun WANG Fangzhou HAN 

机构地区：[1]College of Mechatronic Engineering,North University of China,Taiyuan 030051,China

出　　处：《Chinese Journal of Aeronautics》2022年第1期137-143,共7页中国航空学报（英文版）

基　　金：co-supported by the National Natural Science Foundation of China(No.51201155);the Natural Science of Shanxi Province of China(No.2012011019-1);the Chinese Education Ministry Foundation for Doctors of China(No.20101420120006).

摘　　要：For metal-intermetallic laminated composites,various types of defects often occur during the preparation process.This paper studied the evolution and formation mechanism of defects,such as pores,tunnel cracks,and delamination cracks in Ti-Al_(3)Ti laminated composites prepared by vacuum hot-pressing method.Moreover,quasi-static and dynamic compression tests were performed to study the effects of pores and delamination cracks on the compression properties of the composites.The results showed that for Ti-Al_(3)Ti laminated composites prepared at 710℃,their Al_(3)Ti layers exhibit a porous structure,and the porosity of Al_(3)Ti layers firstly decreases and then increases under the combined action of press,the self-propagating reaction and Al3Ti grain coarsening.The tunnel cracks in Ti-Al_(3)Ti laminated composites are resulted by tensile residual stresses and the inherent brittleness of Al3Ti.For Ti-Al_(3)Ti laminated composites prepared at 680°C,the formation of delamination cracks is mainly related to the diffuse reaction of Ti/Al atoms and the Kirkendall effect,and the numbers of delamination cracks increase with the increasing of sintering time.Moreover,the pores and delamination cracks greatly deteriorate the compression properties of Ti-Al_(3)Ti laminated composites.Crack-free and dense Ti-Al_(3)Ti laminated composites exhibit the highest compression properties.

关 键 词：Compression strength Cracks Diffusion coefficients Laminated composites Scanning electron microscopy 

分 类 号：TB331[一般工业技术—材料科学与工程] V25[航空宇航科学与技术—航空宇航制造工程]