573K高溫時(shí)效處理的Al-10Mg合金中粗大β(Al3Mg2)相對(duì)熱壓縮組織演化的影響及機(jī)理

573K高溫時(shí)效處理的Al-10Mg合金中粗大β(Al3Mg2)相對(duì)熱壓縮組織演化的影響及機(jī)理EFFECT OF COARSE β (Al3Mg2) PHASE ON MICROSTRUCTURE EVOLUTION IN 573K ANNEALED AL-10MG ALLOY BY UNIAXIAL COMPRESSION

本文對(duì)高鎂Al-10Mg合金分別做了固溶與時(shí)效處理，固溶工藝為673K/24h，固溶后的高溫時(shí)效工藝為573K/24h，并對(duì)固溶及時(shí)效態(tài)試樣分別進(jìn)行了兩道次壓縮試驗(yàn)。通過(guò)OM、XRD、EPMA、EBSD等分析表征手段，研究了時(shí)效析出的β相對(duì)高鎂Al-10Mg合金熱變形過(guò)程中的力學(xué)性能及微觀組織演變的影響。結(jié)果表明，時(shí)效處理后晶粒內(nèi)部析出了均勻分布的β相，兩道次壓縮試驗(yàn)后時(shí)效態(tài)試樣的應(yīng)力-應(yīng)變曲線始終處于固溶態(tài)試樣曲線的下方。第一道次壓縮試驗(yàn)中時(shí)效態(tài)試樣的硬化率低于固溶態(tài)試樣的硬化率，在回復(fù)過(guò)程中固溶鎂原子對(duì)形變強(qiáng)化起主要作用，第二道次壓縮試驗(yàn)中時(shí)效態(tài)試樣的硬化率高于固溶態(tài)試樣的硬化率、時(shí)效態(tài)試樣內(nèi)部的位錯(cuò)累積更顯著并且更早地出現(xiàn)了再結(jié)晶軟化。時(shí)效態(tài)試樣壓縮組織內(nèi)殘余了更多的形變儲(chǔ)能，使β相激發(fā)出更多的小角度晶界、進(jìn)而將變形晶?；w切割成若干區(qū)塊，因此促進(jìn)了再結(jié)晶形核從而細(xì)化了再結(jié)晶晶粒。再結(jié)晶形核不再局限于晶界凸出（Bulging）形核，再結(jié)晶晶粒不再具備典型的再結(jié)晶織構(gòu)特性，各向異性被弱化。β相阻礙了位錯(cuò)的滑移，將部分變形儲(chǔ)能累積在沉淀相周?chē)男〗嵌染Ы缣?，減少了滑移到變形晶粒晶界處的位錯(cuò)數(shù)量，從而減緩了變形晶粒晶格的旋轉(zhuǎn)，使變形晶粒含有{001}和{101}兩種面織構(gòu)組分。

Al-Mg series alloy plays an important role in offshore manufacturing, transportation and aerospace industries for its high strength-to-weight ratio, high corrosion resistance and good welding performance. For high Magnesium Al-Mg alloy, β phase always acts as a restraint condition to the whole thermal mechanical processing (TMS) procedure. Its positive effect is still unclear. In this paper, 573K/24h annealed Al-10Mg alloy was selected to study the effect of coarse β (Al3Mg2) phase on microstructure evolution. X-ray Diffraction (XRD), Electron Probe Micro-analyzer (EPMA), Electron Backscattered Diffraction (EBSD) characterization and double passes uniaxial compression were applied. The result shows that discrete coarse β phase precipitated in the interior of grains after 573K/24h annealing treatment. The true stress-true strain curve of annealed sample was lower than that of solution treated one. Hardening rate of annealed sample was lower in first compression pass, and conversely higher than solution treated one in the second pass. Solution Mg atoms played an important role in strain hardening during dynamic recovery. Dislocation slipping was obstructed by coarse β phase, and then low angle boundary (PLAB) was stimulated near coarse β phase. Not just bulging nucleation mechanism working, dynamic recrystallization nucleation was stimulated and microstructure was refined. Since part of deformation-stored energy was lured away by PLAB, lattice rotation of deformed grains were weakened possessing {001} and {101} simultaneously. Schmid factor of three blocks with different lattice orientation were calculated, which suggested that alloy can load more plastic deformation after annealing treatment. Not just bulging nucleation mechanism working, texture of recrystallized new grains was weakened at the same time. Microstructure anisotropy could be controlled by coarse β phase in TMS.

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