Effects of Sc addition and aging on microstructure and martensitic transformation of Ni-rich NiTiHfSc high temperature shape memory alloys
Effects of Sc addition and aging on microstructure and martensitic transformation of Ni-rich NiTiHfSc high temperature shape memory alloys
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Sc添加和时效对富镍NiTiHfSc高温形状记忆合金显微组织和马氏体相变的影响
DOI：
10.1016/j.jallcom.2020.156331
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发表时间：
2020-12
影响因子：
6.2
通讯作者：
Y. F. Zheng
中科院分区：
文献类型：
--
作者：
Y. X. Tong;X. M. Fan;A. V. Shuitcev;F. Chen;B. Tian;L. Li;Y. F. Zheng
在本研究中，研究了Sc添加和时效对Ni50.3Ti29.7-xHf20Scx(x=0、0.5、1和2at.%)合金显微组织和马氏体转变的影响。 Sc的添加导致在室温下形成Sc2O3相以及马氏体和(Ti,Hf)4Ni2Ox。随着 Sc 含量增加到 1 at.%，基体的 Ni 含量略有增加，然后随着 Sc 含量进一步增加到 2 at.%，Ni 含量降低。固溶处理的 NiTiHfSc 合金的转变温度首先以 52 °C/1 at.% Sc 的速率升高，然后以 42 °C/1 at.% Sc 的速率降低。 550°C 时效 3 小时对合金中 H 相析出的影响取决于其 Sc 含量。随着Sc含量的增加，由于基体中Ni含量和第二相的析出，H相的体积分数先减小后增加。时效后，由于H相的析出，马氏体转变的特征温度比固溶处理的合金有所升高。随着Sc含量增加到1 at.%，转变温度的增量首先减小，然后随着Sc含量进一步增加到2 at.%而增加。这可以归因于H相体积分数随Sc含量的变化。
In this study, the effects of Sc addition and aging on the microstructure and martensitic transformation of Ni50.3Ti29.7-xHf20Scx(x = 0, 0.5, 1, and 2 at.%) alloys were investigated. The addition of Sc resulted in the formation of Sc2O3phase along with the martensite and (Ti,Hf)4Ni2Oxat room temperature. The Ni content of the matrix increased slightly with an increase in the Sc content up to 1 at.% and then decreased with a further increase in the Sc content to 2 at.%. The transformation temperature of the solution-treated NiTiHfSc alloys first increased at a rate of 52 °C/1 at.% Sc and then decreased at a rate of 42 °C/1 at.% Sc. The effect of aging at 550 °C for 3 h on the precipitation of the H-phase in the alloys depended on their Sc content. With an increase in the Sc content, the volume fraction of the H-phase first decreased and then increased attributing to the Ni content in the matrix and the evolution of the secondary phase. After aging, the characteristic temperatures of martensitic transformation were elevated as compared to those of solution-treated alloys because of the precipitation of the H-phase. With an increase in the Sc content up to 1 at.%, the increment in transformation temperature was first reduced and then increased with further increasing Sc content to 2 at.%. This can be attributed to the change in the H-phase volume fraction with the Sc content.
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影响因子：
4.4
作者：
K. Ramaiah;C. Saikrishna;J. Bhagyaraj;Gouthama;S. Bhaumik
通讯作者：
K. Ramaiah;C. Saikrishna;J. Bhagyaraj;Gouthama;S. Bhaumik
NiTiHfSc高温形状记忆合金的显微组织和马氏体相变
影响因子：
6.2
作者：
X.M. Fan;S.Y. Sun;Y. X. Tong;L. Li;B. Tian;F. Chen;Y. F. Zheng
通讯作者：
Y. F. Zheng
影响因子：
9.4
作者：
F. Dalle;E. Perrin;P. Vermaut;M. Masse;R. Portier
通讯作者：
F. Dalle;E. Perrin;P. Vermaut;M. Masse;R. Portier
DOI：
--
发表时间：
2019-05
期刊：
--
影响因子：
--
作者：
Y. Tong
通讯作者：
Y. Tong
高循环稳定性和高转变温度TiNi基形状记忆合金的最新进展
影响因子：
3.6
作者：
佟运祥;亚历山大;郑玉峰
通讯作者：
郑玉峰