(1. 重慶大學(xué) 國家鎂合金材料工程技術(shù)研究中心，重慶 400044；
2. 重慶大學(xué) 材料科學(xué)與工程學(xué)院，重慶 400045)
摘 要: 研究用粉末軋制方法制備的Mg-3%Al-1%Zn(質(zhì)量分?jǐn)?shù))合金生帶坯在氬氣氣氛下的燒結(jié)行為，用X射線衍射、差熱分析以及金相方法等分析鎂合金在燒結(jié)過程中的組織變化。結(jié)果表明；粉末軋制鎂合金生帶材可采用“預(yù)燒結(jié)−冷軋−再燒結(jié)”工藝進(jìn)行燒結(jié)，即在氬氣氣氛下550 ℃預(yù)燒結(jié)120 min，然后進(jìn)行大變形量的冷軋，最后在600 ℃下保溫60 min實現(xiàn)燒結(jié)；通過再結(jié)晶、冷變形與燒結(jié)的耦合，獲得的帶材組織均勻，其相對密度達(dá)到97.5%。
關(guān)鍵字: Mg-Al-Zn合金；粉末軋制；燒結(jié)；顯微組織
（1. National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 440044, China;
2. College of Material Science and Engineering, Chongqing University, Chongqing 400045, China）
Abstract: The sintering behavior of green strip of Mg-3%Al-1%Zn magnesium alloy prepared by powder rolling was studied in argon atmosphere. The development of microstructure of magnesium alloy was analyzed by using X-ray diffractometry, DSC and metallography. The results show that the magnesium alloy green strip can be sintered through sintering program of presintering, cold rolling and sintering. The green strip suffers presintering at 550 ℃ for 120 min in argon atmosphere, then standing for large amount of cold roll deformation, and at last sintering at 600 ℃ for 60 min. The strips have uniform microstructure and high relative density of 97.5% by coupling of recrystallization, cold deformation and sintering.
Key words: Mg-Al-Zn alloy; powder rolling; sintering; microstructure
