用正电子寿命谱测量法研究了Ni50.78Ti49.22合金B2相、R相和B19'相的微观缺陷和自由电子密度.通过比较Ni50.78Ti49.22合金在285和227 K时的寿命谱参数,可以发现R相的自由电子密度比B2相的低;R相缺陷的开空间较大,但其缺陷浓度比B2相的低.在100 K时Ni50.78Ti49.22合金处于B19'相.与R相相比,B19'相的自由电子密度增加,缺陷的开空间减小,同时缺陷浓度增大.随着温度的降低,Ni50.78Ti49.22合金中的微观缺陷和自由电子在多阶段马氏体转变中(B2→R→B19'相转变)起着重要作用.
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