(1. 西安交通大學(xué) 金屬材料強(qiáng)度國(guó)家重點(diǎn)實(shí)驗(yàn)室， 西安 710049；
2. 陜西理工學(xué)院 材料科學(xué)與工程系， 漢中 723003)
摘 要: 用示差掃描量熱儀、 X射線衍射儀、 掃描電鏡及能譜儀、 光學(xué)顯微鏡和顯微硬度計(jì)等研究了固溶、時(shí)效工藝及熱循環(huán)對(duì)Ni60Al19Mn16Fe5高溫形狀記憶合金馬氏體（M）相變行為的影響。 固溶淬火態(tài)以及固溶淬火加時(shí)效態(tài)Ni60Al19Mn16Fe5合金冷卻、 加熱時(shí)發(fā)生可逆熱彈性M相變。 M相變溫度、 熱滯和相變熱隨固溶溫度的升高而增加， 時(shí)效對(duì)M相變行為亦有較大影響， 1100℃固溶處理和400℃時(shí)效處理后該合金具有良好的M相變行為。 熱循環(huán)幾乎不影響正M相變， 但第1次熱循環(huán)時(shí)， M顯示穩(wěn)定性效應(yīng)， 使逆M相變推遲。 第1次熱循環(huán)后， 逆M相變不再受熱循環(huán)影響。 該合金的固溶淬火組織為β＇（M）+γ相， 其中γ相約占20 %， M的硬度高于γ相。
關(guān)鍵字: NiAlMnFe； 形狀記憶合金； 固溶處理； 時(shí)效； 相變
shape memory alloy
（1. State Key Laboratory for Mechanical Behavior of Materials,
Xi′an Jiaotong University, Xi′an 710049, China;
2. Department of Materials Science and Engineering,
Shanxi University of Technology, Hanzhong 723003, China）
Abstract:The effects of the solution and ageing treatment processes and thermal cycling on martensitic transformation (MT) behaviors of high temperature shape memory alloy Ni60Al19Mn16Fe5 were investigated by differential scanning calorimetry, X-ray diffraction, SEM, energy dispersion X-ray spectroscopy， optical microscopy and micro-hardness test. A reversible thermoelastic MT takes place during cooling and heating in the solution- and ageing-treated Ni60Al19Mn16Fe5. The MT temperature, temperature hysteresis and transformation heat of the alloy increase with solution temperature increasing. The ageing treatment also strongly affects MT behaviors. An excellent MT behavior can be obtained from 400℃ ageing following 1100℃ solution treatment. Thermal cycling is nearly no effect on the forward MT, but martensite shows stability effect in the first thermal cycle, and makes the reverse MT defer. After the first thermal cycle, the reverse MT is no longer affected by thermal cycling. The microstructure of the quenched Ni60Al19Mn16Fe5 alloy consists of martensite and gamma phase. The volume fraction of gamma phase is about 20%. The hardness of martensite is higher than that of gamma phase.
Key words: NiAlMnFe; shape memory alloy; solution treatment; ageing; transformation
