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OALib Journal期刊
ISSN: 2333-9721
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Ni-Fe-Ga-Co磁性形状记忆合金定向凝固稳定生长区的组织及择优取向
DOI: 10.3724/SP.J.1037.2012.00683, PP. 391-398
Keywords: Ni-Fe-Ga-Co,磁性形状记忆合金,定向凝固,区域熔炼液态金属冷却法,择优取向,马氏体单变体区
Abstract:
采用区域熔炼液态金属冷却定向凝固法制备具有择优取向的Ni52Fe17Ga27Co4磁性形状记忆合金,借助OM,SEM和EBSD研究了稳定生长区的组织特征和择优取向.结果表明,在低温度梯度和高凝固速率下,晶体沿方向生长,但生长不稳定,存在初生γ相;当提高温度梯度和降低凝固速率后,晶体沿方向生长,柱状晶大小均匀,无γ相,室温时为沿(222)面取向的马氏体单相组织.马氏体孪晶孪生面为(110)和(110),内部无微孪晶;在马氏体组织中,观察到了条状分布的磁畴.理论分析结果表明,晶体稳定生长的条件为高的温度梯度和低的凝固速率.在该条件下获得了大体积稳定马氏体单变体区.
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