Al含量对空心阴极等离子烧结Ti/Ni等原子比TiNiAl合金组织和力学性能的影响

doi:10.7527/S1000-6893.2013.0110

Abstract

Abstract:

Ti_50-x/2Ni_50-x/2Al_x(x=0, 3, 6, 9) intermetallic compounds with equal Ti/Ni atom ratio are fabricated through hollow cathode plasma sintering process, and the effect of Al content on the microstructure and mechanical properties of the alloys is investigated. The results show that the microstructure of an alloy without Al consists chiefly of the NiTi matrix, some strengthening phase Ti₂Ni, Ni₃Ti and some pores; with the addition and increase of the Al content, the amount of Ti₂Ni(Al) increases while that of Ni₃Ti(Al) decreases and a small amount of Ni₂TiAl is formed in Ti_45.5Ni_45.5Al₉, while the amount of pores and their sizes increase. The flexural strength of the alloys increases with increasing Al content and reaches the maximum of 296.3 MPa when Al content is 6%, and then it starts to decrease as Al content further increases. The hardness of the alloys increases with increasing Al content and the hardness of Ti_45.5Ni_45.5Al₉ reaches 295.6 HV.

Key words: TiNiAl alloy, Al content, hollow cathode plasma sintering, microstructure, mechanical properties

CLC Number:

V252

LIU Bolu, LIU Zili, LIU Xiqin, WANG Huaitao, WANG Wenjing. Effect of Al Content on Microstructure and Mechanical Properties of Hollow Cathode Plasma Sintering TiNiAl Alloys with Equal Ti/Ni Atom Ratio[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, doi: 10.7527/S1000-6893.2013.0110.

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Effect of Al Content on Microstructure and Mechanical Properties of Hollow Cathode Plasma Sintering TiNiAl Alloys with Equal Ti/Ni Atom Ratio

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