Simultaneous improvement of ductility and shape memory effect of two-phase Ni53Mn22Co6Ga19 high-temperature shape memory alloy with the addition of Ta
- 材料学院－已发表论文 
In this study, small Ta was added into two-phase Ni53Mn22Co6Ga19 high-temperature shape memory alloy to refine grain for further improving the ductility and shape memory effect of the alloy. It is found that small Ta addition results in the refinement of grain size. This change simultaneously improve the tensile ductility and shape memory effect of the alloy, being up to 11% and 3.3% at Ta=0.2 at.%, respectively. With further increasing Ta addition to 0.4 at.%. the ordered gamma' phase is present, and it.tends to wrap gamma phase and segregates martensite and gamma phase, which lead to a decrease in the ductility of the alloy at Ta = 0.4 at.%. The obtained results may provide useful information on improving the ductility and shape memory effect for some other type of two-phase shape memory alloys. (C) 2012 Elsevier B.V. All rights reserved.