(東北大學(xué) 材料與冶金學(xué)院， 沈陽(yáng) 110004)
摘 要: 應(yīng)用自行設(shè)計(jì)傾斜式冷卻剪切實(shí)驗(yàn)裝置， 對(duì)制備Al-3%Mg半固態(tài)合金坯料進(jìn)行研究， 分析工藝條件對(duì)半固態(tài)合金組織的影響， 以及半固態(tài)合金坯料的二次加熱組織及最優(yōu)二次加熱工藝。 結(jié)果表明， 采用傾斜式冷卻剪切技術(shù)可以制備具有良好組織的Al-3%Mg合金半固態(tài)坯料。 獲得了制備半固態(tài)Al-3%Mg合金坯料的最優(yōu)工藝條件： 澆注溫度660~680 ℃； 傾角40°~60°。 在合理的二次加熱工藝條件下， 可獲得優(yōu)良的適于進(jìn)行觸變成形的半固態(tài)合金組織。 二次加熱的最優(yōu)工藝條件為： 加熱溫度620~630 ℃； 保溫時(shí)間90~120 min。
關(guān)鍵字: Al-3%Mg合金； 半固態(tài)； 傾斜式冷卻剪切； 顯微組織
（School of Materials and Metallurgy, Northeastern University,
Shenyang 110004, China）
Abstract: By using the self-designed experimental setup of sloping cooling/shearing, preparing semisolid billet of Al-3%Mg alloy was studied. The effects of technological conditions on the microstructures of the semisolid alloy were analyzed. The microstructures of the remelted semisolid billet were observed and the optimal remelting process was investigated. The results show that the semisolid billet of Al-3%Mg alloy with good microstructures can be obtained by the sloping cooling/shearing process. The optimal process conditions for preparing semisolid billet of Al-3%Mg alloy were obtained: pouring temperature is in the range of 660-680 ℃, sloping angle is in the range of 40°-60°.Under the proper remelting conditions, the excellent semisolid microstructures that are suitable for semi-solid forming can be obtained. The optimal conditions of remelting process are: remelting temperature range of 620-630 ℃, holding time range of 90-120 min.
Key words: Al-3%Mg alloy; semisolid; sloping cooling/shearing; microstructure
