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YUAN Bin, LAI Ming, LIANG Jin-xia, ZENG Mei-qin, GAO Yan. Effect of Sintering Time on Martensitic Transformation during Ageing of Porous NiTi Shape Memory Alloys[J]. Materials and Mechanical Engineering, 2011, 35(1): 6-10.
Citation: YUAN Bin, LAI Ming, LIANG Jin-xia, ZENG Mei-qin, GAO Yan. Effect of Sintering Time on Martensitic Transformation during Ageing of Porous NiTi Shape Memory Alloys[J]. Materials and Mechanical Engineering, 2011, 35(1): 6-10.
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Effect of Sintering Time on Martensitic Transformation during Ageing of Porous NiTi Shape Memory Alloys

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  • Received Date: July 14, 2010
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    • Abstract
  • Porous NiTi shape memory alloys (SMAs) were fabricated by capsule-free hot isostatic pressing(CF-HIP) sintering for different times. The martensitic transformation behavior of the alloys during ageing was investigated by using DSC and SEM. The results show that the alloy sintering at 1 050 ℃ for 1 h mainly consist of Ti2Ni and large Ni3Ti phases. The large Ni3Ti phases disappeared gradually with prolonging the sintering time, the Ti2Ni phase had little change. The Ni4Ti3 phases gradually precipitated and grew from the parent phase in the sintering samples after aging at 450 ℃ with prolonging the aging time. A three-stage (B2→R, R→B19′ and B2→B19′) martensitic transformation was found in the samples sintering for short time, while a two-stage (B2→R and R→B19′) transformation was found in the samples sintering for long time.
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    • References (16)
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