繼續(xù)變形時(shí)的再析出行為
(1. 中南大學(xué) 材料科學(xué)與工程學(xué)院，長(zhǎng)沙 410083；
2. 中南大學(xué) 有色金屬材料與工程教育部重點(diǎn)實(shí)驗(yàn)室，長(zhǎng)沙 410083；
3. 長(zhǎng)沙大學(xué) 機(jī)電工程學(xué)院，長(zhǎng)沙 410003)
摘 要: 利用X射線衍射分析及透射電鏡觀察，研究含析出相的Al-Cu合金經(jīng)多向壓縮變形誘導(dǎo)析出相回溶后形成的過飽和固溶體在繼續(xù)變形過程中的再析出行為。結(jié)果表明：Al-Cu合金中的析出相經(jīng)強(qiáng)塑性變形誘導(dǎo)形成過飽和固溶體；在繼續(xù)變形過程中，當(dāng)變形量增大到一定程度后過飽和固溶體將分解出析出相，此時(shí)析出相的析出順序與常規(guī)態(tài)過飽和固溶體分解的析出順序不同，過渡相析出被抑制，直接形成穩(wěn)定相。當(dāng)過飽和固溶體在繼續(xù)變形過程中析出穩(wěn)定相后，穩(wěn)定相的回溶和再析出交替進(jìn)行。
關(guān)鍵字: Al-Cu 合金；強(qiáng)塑性變形；析出相回溶；再析出
Al-Cu alloy caused by severe plastic deformation during subsequent deformation
（1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Key Laboratory of Nonferrous Metal Materials Science and Engineering, Ministry of Education,
Central South University, Changsha 410083, China;
3. School of Mechatronics Engineering, Changsha University, Changsha 410003, China）
Abstract:The supersaturated solid solution is formed by re-dissolution of precipitated phases during multi-axial compression in aged Al-Cu alloy. The re-precipitation behavior of strain-induced supersaturated solid solution during subsequent deformation was investigated by X-ray diffraction and transmission electron microscopy. The results show that new precipitated phases will precipitate from the strain-induced solid solution when the total strain increases to a certain degree during subsequent deformation; and the precipitation sequence is directly forming stable phases instead of metastable phases, which is different from that of the conventional supersaturated solid solution formed by heat treatment. After that, the stable phases will re-dissolve and re-precipitate alternately.
Key words: Al-Cu alloy; severe plastic deformation; re-dissolution of precipitated phase; re-precipitate
