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Study of Co-Ni-Al Alloys with Magnetically Controlled Shape Memory Effect

机译：磁控形状记忆效应的Co-Ni-Al合金的研究

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摘要

The methods of electron microscopy, resistometry and magnetometry are used to study ten (36-38)Co - (32-36)Ni - (27-30)Al (at. %) alloys. Cast coarse-crystalline and microcrystalline alloys made by melt spinning in a helium atmosphere are considered. It is shown that the martensite start temperature M_s becomes 30-50℃ lower as grains are refined to 1 μ m. Replacement of 1 at. % cobalt by nickel and 1 at. % aluminum by nickel makes the temperature interval of the B2(<->)L1_0 martensite transformation (30-60)℃ and (100-110)℃ higher respectively. The martensite transformation hysteresis is about 100 degrees. The melt-spun Co_(38)Ni_(34)Al_(28) alloy with the transformation temperatures M_s = 31℃, M_f = -34℃, A_s = -6℃, A_f = 70℃ and T_c = 98℃ is a material possessing the magnetically controlled shape memory effect.
机译：用电子显微镜，电阻法和磁力计的方法研究了十种（36-38）Co-（32-36）Ni-（27-30）Al（at。％）合金。考虑了在氦气氛中通过熔融纺丝制成的铸造粗晶和微晶合金。结果表明，随着晶粒细化至1μm，马氏体起始温度M_s降低30-50℃。更换1 at。镍和1 at。铝占镍的百分比使得B2（-）L1_0马氏体转变的温度间隔分别提高（30-60）℃和（100-110）℃。马氏体转变磁滞约为100度。材料是转变温度为M_s = 31℃，M_f = -34℃，A_s = -6℃，A_f = 70℃和T_c = 98℃的熔纺Co_（38）Ni_（34）Al_（28）合金具有磁控形状记忆效应。

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