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董多,苏勇君,朱冬冬,周兆忠,倪成员,贺庆,魏尊杰.SPS烧结温度对Ti-45Al-8Nb合金组织及力学性能影响研究[J].稀有金属材料与工程(英文),2019,48(12):4101~4105.[Dong duo,Su Yongjun,Zhu Dongdong,Zhou Zhaozhong,Ni Chengyuan,He Qing and Wei Zunjie.Microstructure and mechanical properties of Ti?45Al?8Nb alloy sintered at different SPS temperatures[J].Rare Metal Materials and Engineering,2019,48(12):4101~4105.]
Microstructure and mechanical properties of Ti?45Al?8Nb alloy sintered at different SPS temperatures
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Received:August 12, 2018  Revised:September 06, 2018
DOI:
Key words: Spark Plasma Sintering (SPS)  Ti-45Al-8Nb  pre-alloyed powder
Foundation item:国家自然科学资助(项目号51501100,51801112)浙江省自然科学资助(项目号Y18E010014)
Author NameAffiliation
Dong duo,Su Yongjun,Zhu Dongdong,Zhou Zhaozhong,Ni Chengyuan,He Qing and Wei Zunjie  
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Abstract:
      In this paper, TiAl alloys with a nominal composition of Ti-45Al-8Nb (at.%) were prepared by spark plasma sintering (SPS) process. The effect of sintering temperatures on microstructure and mechanical properties of Ti-45Al-8Nb alloy has been studied. The results show that the microstructures of Ti-45Al-8Nb alloy sintered at different temperatures all exhibit full lamellae structure. With the increasing of sintered temperature, the amount of γ phase in the alloy increases and α2 phase decreases. There is no B2 Phase when sintered at 1250℃. As the sintering temperature increases, the B2 phase precipitates at the grain boundary and the amount of B2 phase increases. The main reason is that the alloy may melt at local areas with the increasing of sintering temperature; the β phase would order to B2 phase at high cooling rates. The tensile strength and compression ratio decreases with the sintering temperature increasing from 1250℃ to 1300℃. The maximum tensile strength and compression ratio reached 2084.20MPa and 33.10% at 1250℃ respectively.