Effects of Al on microstructural stability and related stress-rupture properties of a third-generation single crystal superalloy
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2019年第11期
论文作者：Jingxia Sun Jinlai Liu Lirong Liu Yizhou Zhou Jinguo Li Xiaofeng Sun
文章页码：2537 - 2542
摘 要：To examine the influences of minor modification of Al content on the microstructural stabilities and stress rupture properties,two alloys with minor difference in Al content were exposed isothermally at 1100 ℃ for 100 h,500 h,and 1000 h,respectively.The microstructures were characterized before and after thermal exposure.It was found that when Al content was decreased by 0.4 wt %,the volume fractionγ’ decreased by 4 %,the size of γ’ increased by 40 nm,the matrix channel width increased by 5 nm,and the misfit degree of γ/γ’ phases increased by 0.006 % after heat treatment（HT）.During thermal exposure,the alloy with low Al content had a better resistance to coarsening of γ’ phase and precipitation of μphase.The γ’ particles of the alloy with high AI content tended to connect each other and coarsened along <100>directions;however,the γ’ particles of the alloy with low Al content remained cubic after 500 h.A serious coarsening behavior took place in the two alloys after aging for 1000 h.The structural stabilities were significantly improved.However,the change of 0.4 wt % Al content was found to have little effect on the high temperature stress-rupture properties.
Jingxia Sun1,2，Jinlai Liu1，Lirong Liu2，Yizhou Zhou1，Jinguo Li1,3，Xiaofeng Sun1
1. Institute of Metal Research,Chinese Academy of Sciences2. School of Materials Science and Engineering,Shenyang University of Technology3. Space Manufacturing Technology Key Lab,Chinese Academy of Sciences
摘 要：To examine the influences of minor modification of Al content on the microstructural stabilities and stress rupture properties,two alloys with minor difference in Al content were exposed isothermally at 1100 ℃ for 100 h,500 h,and 1000 h,respectively.The microstructures were characterized before and after thermal exposure.It was found that when Al content was decreased by 0.4 wt %,the volume fractionγ’ decreased by 4 %,the size of γ’ increased by 40 nm,the matrix channel width increased by 5 nm,and the misfit degree of γ/γ’ phases increased by 0.006 % after heat treatment（HT）.During thermal exposure,the alloy with low Al content had a better resistance to coarsening of γ’ phase and precipitation of μphase.The γ’ particles of the alloy with high AI content tended to connect each other and coarsened along <100>directions;however,the γ’ particles of the alloy with low Al content remained cubic after 500 h.A serious coarsening behavior took place in the two alloys after aging for 1000 h.The structural stabilities were significantly improved.However,the change of 0.4 wt % Al content was found to have little effect on the high temperature stress-rupture properties.
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