Control of microstructural characteristics and martensitic transformation behavior of Ti–Ni–Cu alloys by Pt doping
Control of microstructural characteristics and martensitic transformation behavior of Ti–Ni–Cu alloys by Pt doping
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Pt掺杂控制Ti-Ni-Cu合金的显微组织特征和马氏体转变行为
DOI：
10.1016/j.jallcom.2019.06.217
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发表时间：
2019-09
影响因子：
6.2
通讯作者：
Zhao Liancheng
中科院分区：
文献类型：
--
作者：
Yi Xiaoyang;Wang Haizhen;Gao Weihong;Sun Bin;Niu Xinyu;Meng Xianglong;Li Jun;Gao Zhiyong;Cai Wei;Zhao Liancheng
系统研究了铂替代铜对钛镍铜合金显微组织和马氏体相变行为的影响。固溶处理后的合金在室温下由B19马氏体和Ti2(Ni，Cu，Pt)相组成。由于(011)复合孪晶在相变过程中的剪切应变和切变角较小，因此在Ti-Ni-Cu-PT合金中，(011)复合孪晶比(111)I型孪晶更常见。加热过程中，较低温度的单一B19马氏体一次转变为高温B2奥氏体相。相反，在冷却过程中，B2奥氏体直接转变为B19马氏体。当铂含量从1.0 at.%增加到3.0 at.%时，相变温度呈现先降低后升高的趋势。此外，通过调整铂含量可以获得较窄的热滞和良好的热循环稳定性。良好的热力学特性归因于较低的摩擦功和良好的几何兼容性。
The effect of the substitution of Pt for Cu on the microstructure and martensitic transformation behaviors of Ti–Ni–Cu alloys was investigated systematically. The solution-treated Ti–Ni–Cu–Pt alloys were found to consist of the B19 martensite and Ti2(Ni,Cu,Pt) phases at room temperature. The (011) compound twin was more frequently observed than the (111) type I twin in the Ti–Ni–Cu–Pt alloys owing to the lower shear strain and shear angle of the (011) compound twin during the transformation process. During heating, the lower temperature single B19 martensite transformed in one stage into high-temperature B2 austenite. Conversely, the B2 austenite was transformed directly into B19 martensite during cooling. As the Pt content increased from 1.0 at.% to 3.0 at.%, the transformation temperatures first decreased and then increased. In addition, a narrower thermal hysteresis and perfect thermal cycling stability can be obtained by tailoring the Pt content. The excellent thermodynamic characteristics can be attributed to the lower frictional work and good geometric compatibility.
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