Effect of Shape Memory Heat Treatment on Microstructures and Mechanical Properties of Powder Metallurgy TiNi Shape Memory Alloy

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  • TiNi形状記憶粉末合金の組織および力学的特性に及ぼす形状記憶熱処理の影響
  • TiNi ケイジョウ キオク フンマツ ゴウキン ノ ソシキ オヨビ リキガクテキ トクセイ ニ オヨボス ケイジョウ キオク ネツ ショリ ノ エイキョウ

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<p>The shape memory heat treatment effects on the microstructures and the mechanical properties of TiNi shape memory alloys fabricated by powder metallurgy (PM) process were investigated in this study. Through the optimization of the shape memory heat treatment conditions, PM TiNi alloy showed a high plateau stress of 454 MPa and a good shape recovery of 96.4% in 8% strain applied via the heat treatment at 773 K for 10 min. A longtime heat treatment applied to PM TiNi alloys caused an increase of the amount of Ti3Ni4 precipitates in the TiNi matrix, and led to the relative decrease of Ni solid solution in the matrix which resulted in the decrease of the plateau stress.</p>

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