郭欣,高丽,徐阳睿,辛向阳

• 1:上海海洋大学工程学院

摘要(Abstract)：

为了提升Ni-Mn-Sn磁性形状记忆合金的力学性能与弹热效应，研究了B元素掺杂对其性能的影响。采用真空电弧熔炼制备了不同B含量的(Ni_(43)Mn_(47)Sn_(10))_(100-x)B_x(x=0、0.4和0.8,at%)合金，并对其进行了固溶处理。采用扫描电镜、X射线衍射仪和电子万能实验机等研究了铸态和固溶态合金的微观组织、晶体结构、马氏体相变、力学性能及弹热效应。结果表明：B元素掺杂引起晶胞体积的增大和马氏体相变温度的降低，提高了合金的力学性能，尤其是铸态合金的力学性能提升更为明显；合金的断裂形貌由沿晶断裂向穿晶断裂转变，晶界结合力增强；当B含量达到0.8 at%时，铸态合金在320 MPa应力下获得-4.6 K的绝热温度变化，弹热效应有所增强，表明其在弹热制冷领域具有良好的应用前景。

关键词(KeyWords)： Ni-Mn-Sn磁性形状记忆合金;力学性能;弹热效应;马氏体相变

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 郭欣,高丽,徐阳睿,辛向阳

DOI: 10.13289/j.issn.1009-6264.2024-0427

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