摘要
在真空电弧炉中熔炼母合金,然后进行固溶处理和不同时间的时效处理,制备了Mn70Cu30合金。应用X射线衍射分析、显微形貌观察、差示扫描量热法、标准电阻应变计法等实验方法,研究了时效处理对Mn70Cu30合金的组织和磁感生应变的影响。结果表明,经过时效处理的Mn70Cu30合金会发生fcc(γ)→fct(γ’)马氏体相变,从而形成γ+γ’两相结构;随着时效时间的延长,合金更容易发生γ→γ’转变,获得的最大磁感生应变更大;当时效时间超过12h,合金中会析出大量的α相,使得磁感生应变性能变差。
Mn70Cu30 alloy was prepared by melting master alloy in vacuum arc furnace and subsequent solution treatments and aging for diferent time.Effect of aging on the microstructure and magnetic-field-induced strain（MFIS） in Mn70Cu30 alloy was investigated by means of X-ray diffraction,photomicrograph,DSC,resistance strain gauge method.As a result,Mn70Cu30 alloy consists of fcc（γ） and fct（γ’） phases after aging because of γ→γ’ martensitic transformation.The volume proportion of γ’ phase increases with the increase of aging time,so that the samples possess much better MFIS performance.But when aging time exceeds 12h,there is a large quantity of α-phase separating out,which degrading the MFIS of alloy.
出处
《磁性材料及器件》
CAS
CSCD
北大核心
2010年第4期27-30,53,共5页
Journal of Magnetic Materials and Devices
基金
教育部科学技术研究重点项目(209067)
中国博士后科学基金资助项目(2008441084)
江西省自然科学基金资助项目(2007GCZ1714)
江西省教育厅科技项目(GJJ08004)
