以孔隙率为43%~58%的多孔Ti-51%Ni(原子分数)合金为研究对象,研究了其微观形貌、物相组成和相变特征,以及在不同压缩载荷下的压缩回弹性能,分析了其变形机制.结果表明:试验合金的孔隙分布比较均匀,孔隙率对其相组成和相变行为影响很小;在不同压缩载荷下存在线性超弹和平台锯齿两种变形机制;在线性超弹阶段,试验合金同时具备较高的压缩率和回弹率;在平台锯齿阶段,回弹能力几乎丧失.
Using the porous Ti-51%Ni (atom fraction) alloy with the porosities of 43%-58% as the research object, the micromorphology, phase composition, phase transformation behavior, and the compression and recovery properties under different compressive loads of the alloy were investigated.And the deformation mechanism was analyzed.The results show that the pores in the tested alloy distributed homogeneously.The porosity had little influence on the phase composition and phase transformation behavior.Two deformation mechanisms, namely the linear superelasticity and the saw-tooth plateau, were found under different compressive loads.At the stage of linear superelasticity, the tested alloy had relatively high compressibility and high recovery rate while almost lost the recovery ability at the stage of saw-tooth plateau.
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