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本文以Fe59.5Ni28Al11.5Ta1形状记忆合金为研究对象,采用金相显微镜、X射线衍射仪、扫描电镜、能谱仪和压力试验机等研究了轧制后不同时效时间处理对该合金组织结构和性能的影响.结果表明,随着时效的进行,γ′相和β′相的相继析出,强化了奥氏体基体.综合伪弹性曲线看出,随着时效时间的增加,600C时效态合金的应力诱发马氏体临界应力先减小后增大,合金的抗压强度、可恢复的应变和硬度都先增大后减小,合金的残余应变则先减小后增大,时效时间为60h时,合金的抗压强度最大,到达1306MPa,此时合金的可恢复形变最大,达到14.9%,合金的硬度也最大,合金的残余应变相对最小.但随着时效时间的延长,合金的最大应变逐渐减小,合金塑性逐渐减小.Fe59.5Ni28Al11.5Ta1形状记忆合金的性能与沉淀相的颗粒大小、分布、体积分数等因素有关.
In this paper, Fe59.5Ni28Al11.5Ta1 shape memory alloy as the research object, using the metallographic microscope, X-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy and pressure testing machine studied the different aging time after rolling the microstructure and The results show that the austenite matrix is strengthened by the successive precipitation of γ ’phase and β’ phase with the aging time.It can be seen from the synthetic pseudo-elastic curve that with the increase of aging time, The stress-induced martensite first decreases and then increases the critical stress, and the compressive strength, recoverable strain and hardness of the alloy first increase and then decrease, and the residual strain of the alloy first decreases and then increases, and the aging time is 60h , The compressive strength of the alloy is the largest, reaching 1306MPa, the recoverable deformation of the alloy is the largest, reaching 14.9%, the hardness of the alloy is also the largest, the residual strain of the alloy is relatively minimum.However, with the aging time, the maximum strain of the alloy And the plasticity of the alloy decreases gradually.The properties of the Fe59.5Ni28Al11.5Ta1 shape memory alloy are related to the particle size, distribution and volume fraction of the precipitated phase.