Journal
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
Volume 24, Issue 1, Pages 126-130Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S1003-6326(14)63037-5
Keywords
shape memory alloy; Ni-Mn-Ga; Al addition; martensitic transformation
Categories
Funding
- National Natural Science Foundation of China [51101057]
- Fundamental Research Funds for the Central Universities of China [12MS10]
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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.
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