Improvement of mechanical property and large shape recovery of sintered Ni45Mn36.6In13.4Co5 alloy
Improvement of mechanical property and large shape recovery of sintered Ni45Mn36.6In13.4Co5 alloy
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DOI：
10.1016/j.jallcom.2018.06.244
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发表时间：
2018-10-15
影响因子：
6.2
通讯作者：
Wang, Pan
中科院分区：
文献类型：
--
作者：
Feng, Yan;Chen, Hong;Wang, Pan
采用放电等离子烧结法制备了具有择优取向的Ni45Mn36.6In13.4Co5磁性形状记忆合金。在1073 K烧结时，晶粒的取向变得随机。在873 K烧结时，部分晶粒生长不均匀，部分柱状晶在较大的压力下发生断裂。放电等离子烧结Ni-Mn-In-Co合金薄带可显著提高合金的力学性能。在873 K下烧结的Ni45Mn36.6In13.4Co5块体的压缩断裂强度和应变分别为1200 MPa和14%，约为铸态的2倍。力学性能的提高主要是由于烧结锭中织构化组织和相对细小的晶粒。在873 K烧结的合金具有几乎完美的形状记忆效应，约95%的压缩应变（高达11.4%）在加热过程中可恢复，并且在逆马氏体相变过程中实现了形状恢复，这预示着多晶合金具有较高的磁场诱导应变恢复。(C)2018 Elsevier B. V.版权所有。
High mechanical properties Ni45Mn36.6In13.4Co5 magnetic shape memory alloy with preferred orientation were prepared by spark plasma sintering melt-spinning ribbons piled up orderly. Sintered at 1073 K, the orientation of grains becomes random. Sintered at 873 K, part of the grains grows inhomogeneously and some of the columnar grains are fractured under relatively large compressive pressure. Mechanical properties of Ni-Mn-In-Co alloy are improved significantly by spark plasma sintering the ribbons. The compressive fracture strength and strain of the Ni45Mn36.6In13.4Co5 bulks sintered at 873 K are 1200 MPa and 14%, which are approximately two times larger than that of ingots as-cast. The improvement of mechanical property can be attributed to the textured microstructure and relatively tiny grains in sintering ingots. It must be mentioned that the alloys sintered at 873 K show almost perfect shape memory effect, about 95% compressive strains (as high as 11.4%) was recoverable during heating, and shape recovery is achieved in reverse martensitic transformation process, which predicts a relatively high magnetic field induced strain recovery in polycrystalline. (C) 2018 Elsevier B.V. All rights reserved.