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Co摻雜對NiTiNb形狀記憶合金組織和性能的影響
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國家自然科學基金青年基金（50801018）；哈爾濱工業(yè)大學優(yōu)秀青年教師培養(yǎng)計劃（HITQNJS.2007.015）；哈爾濱工業(yè)大學創(chuàng)新基金（HIT.NSRIF.2008.34）


Effects of Co Addition on Microstructure and Mechanical Properties of NiTiNb Shape Memory Alloys
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    摘要:

    研究了Co摻雜對寬滯后NiTiNb合金的組織結(jié)構(gòu)、相變行為、形狀記憶效應(yīng)和力學性能的影響。結(jié)果表明：Co的添加不僅有效抑制了NiTiNb合金中的(Ti,Nb)2Ni相的形成，同時還降低了合金的馬氏體相變開始溫度(Ms)；摻Co在維持相變滯后（111 ℃）較高水平的情況下，使NiTiNb合金的屈服強度、延伸率、恢復(fù)力和最大恢復(fù)率分別從320 MPa、20%、434 MPa和5.3%增加到460 MPa、24.5%、486 MPa和7.8%。因而合金化是提高NiTiNb合金強度和恢復(fù)力的一種有效方式。

    Abstract:

    Effects of Co addition on the microstructure, phase transformation behavior, shape memory effect and mechanical properties of the wide hysteresis NiTiNb alloy were investigated. The results show that the addition of Co not only restrains the appearance of brittle (Ti,Nb)2Ni phase effectively, but also decreases markedly the martensite transformation temperature (Ms) in NiTiNb alloys. The value of wide hysteresis becomes narrower from 119.3 to 111 ℃ with the addition of Co element, but still remains enough high level. Compared with the NiTiNb alloys, the yield stress, the elongation, the recovery stress and the maximum recovery strain of NiTiNbCo alloys are increased from 320 MPa, 20%, 434 MPa and 5.3% to 460 MPa, 24.5%, 486 MPa and 7.8％, respectively. Therefore, alloying is an effective method to improve the yield stress and recovery stress.

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隋解和,劉愛蓮,黎云飛,蔡 偉. Co摻雜對NiTiNb形狀記憶合金組織和性能的影響[J].稀有金屬材料與工程,2009,38(10):1752~1755.[Sui Jiehe, Liu Ailian, Li Yunfei, Cai Wei. Effects of Co Addition on Microstructure and Mechanical Properties of NiTiNb Shape Memory Alloys[J]. Rare Metal Materials and Engineering,2009,38(10):1752~1755.]
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  • 收稿日期:2008-09-15
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