| Effects of sintering temperature and time on defect evolution and compression properties of Ti-Al3Ti laminated composites |
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| 作者姓名： | Meini YUAN Zhijun WANG Fangzhou HAN |
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| 作者单位： | College of Mechatronic Engineering,North University of China,Taiyuan 030051,China |
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| 基金项目： | 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)； |
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| 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-Al3Ti 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 resu...
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| 收稿时间： | 12 April 2020 |
Effects of sintering temperature and time on defect evolution and compression properties of Ti-Al3Ti laminated composites |
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| Meini YUAN,Zhijun WANG,Fangzhou HAN.Effects of sintering temperature and time on defect evolution and compression properties of Ti-Al3Ti laminated composites[J].Chinese Journal of Aeronautics,2022,35(1):137-143. |
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| Authors: | Meini YUAN Zhijun WANG Fangzhou HAN |
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| Institution: | College of Mechatronic Engineering, North University of China, Taiyuan 030051, China |
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| Abstract: | For metal-intermetallic laminated composites,various types of defects often occur dur-ing the preparation process.This paper studied the evolution and formation mechanism of defects,such as pores,tunnel cracks,and delamination cracks in Ti-Al3Ti laminated composites prepared by vacuum hot-pressing method.Moreover,quasi-static and dynamic compression tests were per-formed to study the effects of pores and delamination cracks on the compression properties of the composites.The results showed that for Ti-Al3Ti laminated composites prepared at 710℃,their Al3Ti layers exhibit a porous structure,and the porosity of Al3Ti layers firstly decreases and then increases under the combined action of press,the self-propagating reaction and Al3Ti grain coars-ening.The tunnel cracks in Ti-Al3Ti laminated composites are resulted by tensile residual stresses and the inherent brittleness of Al3Ti.For Ti-Al3Ti laminated composites prepared at 680℃,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-Al3Ti laminated composites.Crack-free and dense Ti-Al3Ti laminated composites exhibit the highest compression properties. |
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| Keywords: | Compression strength Cracks Diffusion coefficients Laminated composites Scanning electron microscopy |
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