(1. 中南大學(xué) 材料科學(xué)與工程學(xué)院, 長沙 410083;
2. 合肥工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院, 合肥 230009)
摘 要: 利用金相顯微鏡、 透射電鏡、 掃描電鏡觀察和力學(xué)性能測試等手段研究了Cu-18.4Al-8.7Mn-3.4Zn-0.1Zr（摩爾分?jǐn)?shù)， %）記憶合金（多晶）在不同溫度與組織下變形時的力學(xué)行為。 實(shí)驗(yàn)合金在不同溫度下變形時延伸率不同，變形溫度（Td）在Ms與Af之間時的延伸率小于變形溫度（Td）高于Af時的延伸率。 對實(shí)驗(yàn)合金施加應(yīng)力時， 最初的變形主要來自應(yīng)力誘發(fā)馬氏體，繼而發(fā)生馬氏體變體擇優(yōu)合并， 二者對合金的變形都有貢獻(xiàn)； 變形量更大時， 變體界面共格性被破壞， 部分馬氏體喪失熱彈性。 少量α相的析出不影響記憶效應(yīng)， 可使延伸率得以提高。
關(guān)鍵字: Cu-Al-Mn-Zn-Zr記憶合金； 應(yīng)力誘發(fā)馬氏體； 延伸率
mechanical behavior of CuAlMnZnZr
shape memory alloy
XU Gen-ying1, XIAO Cong-wen1
（1. School of Materials Science and Engineering,
Central South University, Changsha 410083, China;
2. School of Materials Science and Engineering,
Hefei University of Technology, Hefei 230009, China;）
Abstract:Mechanical behavior of CuAlMnZnZr shape memory alloy with different microstructures deformed at different temperatures was studied by means of optical microscopy, scanning fracture morphology, TEM observation and the mechanical property measurement. The elongations are different when the tested alloy are deformed at different temperatures. Under the stress, the original deformation derives from the stress-induced martensite, and then the stress-induced martensite takes preferential merger. With the increase of the deformation, the coherent boundaries between the variants are destroyed, a part of the stress-induced martensite lose the thermoelasticity. The precipitation of minor α phase which has little effect on its shape memory effect can enhance its elongation .
Key words: Cu-Al-Mn-Zn-Zr shape memory alloy; stress-induced martensite; elongation
