Microstructure and transformation behavior of Ni54Mn25Ga15Al6 high-temperature shape memory alloy

作者：Xin, Yan^*; Li, Yan

来源：Transactions of Nonferrous Metals Society of China, 2014, 24(1): 126-130.

DOI：10.1016/S1003-6326(14)63037-5

• shape memory alloy
• Ni-Mn-Ga
• Al addition
• martensitic transformation

The microstructure, martensitic transformation behavior, mechanical properties and shape memory effect of Ni54Mn25Ga15Al6 high-temperature shape memory alloy were investigated. By comparing with the Ni54Mn25Ga21 alloy, the effect of Al addition on the properties of Ni-Mn-Ga alloys was analyzed. The results show that the Ni54Mn25Ga15Al6 alloy has a single-phase tetragonal non-modulated martensite structure with lamellar twins. The martensitic transformation start temperature of this alloy is up to 190 degrees C, displaying the promising application as a high-temperature shape memory alloy. Al addition in Ni-Mn-Ga alloy can decrease the martensitic transformation temperatures due to the effect of size factor and improve the strength and plasticity. However, the shape memory effect is reduced remarkably with the Al addition.

• 出版日期2014-1
• 单位华北电力大学（保定）; 华北电力大学; 北京航空航天大学