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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
Received date: 2012-03-29
Revised date: 2012-05-03
Online published: 2013-03-29
Supported by
Changshu Science and Technology Development Planning Project (CC200913)
Ti50-x/2Ni50-x/2Alx(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 Ti45.5Ni45.5Al9, 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 Ti45.5Ni45.5Al9 reaches 295.6 HV.
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, 2013 , 34(3) : 711 -718 . DOI: 10.7527/S1000-6893.2013.0110
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