Compressive Low Cycle Fatigue Behavior of Ni2MnGa Ferromagnetic Shape Memory Alloy Single Crystals

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  • Ｎｉ２ＭｎＧａ強磁性形状記憶合金単結晶の低サイクル圧縮疲労挙動
  • Ni2MnGa キョウジセイ ケイジョウ キオク ゴウキンタンケッショウ ノ テイサイクル アッシュク ヒロウ キョドウ

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Abstract

The purpose of the present work is to clarify the fatigue behavior of Ni-25 mol%Mn-23 mol%Ga ferromagnetic shape memory alloy at a temperature below martensite finish temperature. Low cycle fatigue tests for single crystal specimens were carried out using a custom-made compressive testing machine which was capable to change loading conditions without interruption. The specimens were deformed with formation and propagation of Lüders bands, where rearrangement of martensite variants took place to accommodate strain under compressive loading. Fatigue failure occurred in transgranular mode by the connection of microcracks with two different directions formed at the Lüders bands. The Lüders band front was initially defined clearly, but it became unclear and wide due to the microcrack growth with increasing the number of cycles. Fracture surface was found to be lath-like, and it seemed to be consisted of the interface of martensite variants.

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