采用区熔法制备了Ni50 5Mn2 4 Ga2 5 5取向晶体 ,在底部、中部和顶部各切取一块样品进行相变应变测试 .在中部样品中获得了高达 1 4 %的相变应变 ,应变随加热冷却循环次数的增加而逐步降低 ,第 9次和第 10次相变时应变为0 8% .在底部和顶部样品中 ,降温过程的应变随温度的变化呈现先收缩后膨胀或先膨胀后收缩的现象 ,我们认为这是由于样品中高度择优取向的马氏体变体竞争的结果所致 . Ni50 5Mn2 4 Ga2 5 5 oriented crystals were prepared by zone melting method, and a sample was cut at the bottom, middle and top for phase transformation strain test, up to 14% phase transformation strain was obtained in the middle sample. The strain was changed with heating and cooling The number of cycles is gradually decreased, and the strain should be 0 8% at the 9th and 10th transformations. In the bottom and top samples, the strain of the cooling process changes with the temperature at first shrinkage and then shrinkage Phenomenon, which we think is due to competition from the highly preferred oriented martensite variant in the sample.