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首页> 外文期刊>Materials at High Temperatures >Effect of Cu-x substituted for Ga-x on the thermodynamic and fracture behavior in magnetic shape memory Ni50Mn30Ga20-xCux with high transformation temperature
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Effect of Cu-x substituted for Ga-x on the thermodynamic and fracture behavior in magnetic shape memory Ni50Mn30Ga20-xCux with high transformation temperature

机译：高转化温度磁形记忆Ni50mN30Ga20-Xcux中热力学和断裂行为对Ga-X取代的Cu-x效应

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摘要

The effect of Cu-x substituted for Ga-x on the thermodynamic characteristic, evolution of phases and fracture behavior in Ni50Mn30Ga20-xCux alloys have been investigated. The results show that the martensitic transformation, reverse transformation temperatures and average interface temperature of Ni50Mn30Ga20-xCux sample increase remarkably with increased content of Cu. The hysteresis temperature of the austenite to martensite transition firstly showed a steep rising trend, then almost reduced to a lower rate with the increased content of Cu up to 4 at.% (the maximum level of copper addition studied). The (202) diffraction peak position was observed to shifted towards high angles, when the Cu content was lower than 1 at.%. Further, the, M-202 diffraction peak was found to split into two diffraction peaks when the Cu content was more than 1 at.%. In addition, the compressive strength and fracture strain of alloys is clearly enhanced with increased content of Cu. Furthermore, the fracture type of Ni50Mn30Ga20-xCux alloys was found to changes from intergranular fracture for the Ni-Mn-Ga alloys, to transgranular cleavage fracture with increase in Cu content.
机译：研究了Cu-X取代的Ga-X对Ni50MN30GA20-Xcux合金的热力学特性，阶段的演化和断裂行为的影响。结果表明，由于Cu的含量增加，马氏体转化，逆转变换温度和Ni50mN30ga20-Xcux样品的平均接口温度增加。奥氏体到马氏体转变的滞后温度首先显示出陡峭的上升趋势，然后几乎降低到较低的速率，随着Cu的增加，含量增加到4℃。％（所研究的最大铜添加水平）。观察到（202）衍射峰位置以朝向高角度移位，当Cu含量低于1时。％。此外，发现M-202衍射峰被分裂成当Cu含量大于1时的两个衍射峰。％。此外，随着Cu的含量增加，合金的抗压强度和裂缝应变显然。此外，发现Ni50mN30Ga20-Xcux合金的断裂型从晶间骨折的晶间骨折变化，转变为Cu含量的旋转裂解骨折。

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