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利用梯级粉末烧结法成功制备出轻质高阻尼的多孔TiNiCu形状记忆合金,并对其组织、相变行为、阻尼性能以及力学性能进行深入研究。研究发现,所制备的多孔TiNiCu合金的表观密度随着Cu含量的增加而降低;在降温和升温过程中,由于多孔Ti50Ni40Cu10合金基体中相变的滞后和叠加而使其相变温度区间宽化,相变峰弱化;而多孔Ti50Ni30Cu20合金基体中发生B2-B19相变而使其具有窄的相变温度区间以及较高的相变峰;多孔Ti50Ni40Cu10合金的形状回复率低于多孔Ti50Ni50合金的,而多孔Ti50Ni30Cu20合金的形状回复率则高于多孔Ti50Ni50合金的。研究还表明,多孔TiNiCu合金的内耗值随着Cu含量的增加而增大,其中多孔Ti50Ni30Cu20合金的一个显著特性是具有很高的等效内耗,其最大等效内耗值是多孔Ti50Ni50合金的5倍。
The porous TiNiCu shape memory alloy with light weight and high damping was successfully prepared by cascade powder sintering. The microstructure, transformation behavior, damping capacity and mechanical properties of TiNiCu shape memory alloy were studied. The results show that the apparent density of the prepared porous TiNiCu alloy decreases with the increase of Cu content. During the cooling and heating process, the phase transition temperature range is widened due to the lag and superposition of phase transformation in the porous Ti50Ni40Cu10 alloy matrix , And the phase transition peak is weakened. However, the phase transformation of B2-B19 in the porous Ti50Ni30Cu20 alloy has a narrow phase transition temperature range and a high phase transition peak. The shape recovery rate of the porous Ti50Ni40Cu10 alloy is lower than that of the porous Ti50Ni50 alloy, The shape recovery rate of porous Ti50Ni30Cu20 alloy is higher than that of porous Ti50Ni50 alloy. The study also shows that the internal friction value of porous TiNiCu alloy increases with the increase of Cu content. One of the remarkable characteristics of porous Ti50Ni30Cu20 alloy is its high equivalent internal friction, its maximum equivalent internal friction is five times that of porous Ti50Ni50 alloy .