Effect of heat treatment on morphology evolution of Ti2Ni phase in Ti-Ni-Al-Zr alloy
The Ti6Al2Zr alloy with 15 wt.%Ni addition was prepared and then heat treated in the research.The microstructure of the alloy and evolution of Ti2Ni precipitate were investigated.The microstructure observations demonstrate that the Ni addition could promote the formation of eutectoid and eutectic structures in Ti-Al-Zr alloy.In the eutectoid structure,the ultrafine Ti2Ni fiber precipitates in the α-Ti matrix,but in the eutectic structure,the fine α-Ti phases precipitate in the Ti2Ni matrix.The heat treatment could change the morphology of Ti2Ni precipitates by thinning,fragmenting,merging and spherizing.In the alloy heat treated at and below 1073K,the coarsening of α-Ti precipitates in eutectic structure and Ti2Ni precipitates in eutectoid structure is the mainly characteristic.In the alloy heat treated above 1073K,the phase transformation of α to β phase is the main characteristic,which changes the morphology and amount of Ti2Ni phase by the solid solution of Ni.The phase transformation temperature of Ti-Ni-Al-Zr alloy is between 1073-1123K,which is increased compared with that of the Ti-Ni binary phase diagram.
Liyuan Sheng Yang Yang Tingfei Xi
Shenzhen Institute,Peking University,Shenzhen,China
国际会议
上海
英文
1-6
2017-12-28（万方平台首次上网日期，不代表论文的发表时间）