(1. 哈爾濱工程大學(xué) 機(jī)電工程學(xué)院, 哈爾濱 150001;
2. 哈爾濱理工大學(xué) 材料科學(xué)與工程學(xué)院, 哈爾濱 150080)
摘 要: 采用應(yīng)變誘發(fā)方法制備了AZ91D鎂合金半固態(tài)材料。 考察了變形率、 溫度、 保溫時(shí)間對(duì)固相體積分?jǐn)?shù)、組織形態(tài)以及晶粒尺寸的影響。 結(jié)果表明： 在冷變形條件下， 于570℃保溫一定時(shí)間后， 可制備出固相體積分?jǐn)?shù)最小達(dá)55%的鎂合金半固態(tài)材料。 分析討論了AZ91D鎂合金半固態(tài)組織的形成機(jī)理。在熱處理過(guò)程中， 組織發(fā)生再結(jié)晶， 而冷變形程度對(duì)再結(jié)晶的組織有顯著影響。
關(guān)鍵字: AZ91D； 冷變形； 應(yīng)變誘發(fā)； 半固態(tài)； 微觀(guān)組織
AZ91D magnesium alloy by SIMA process
（1. Mechanical and Electrical Engineering College,
Harbin Engineering University, Harbin 150001, China;
2. Department of Materials Science and Engineering,
Harbin University of Science and Technology, Harbin 150080, China）
Abstract:The SIMA(strain-induced melt activation) process used to prepare the semi-solid material of AZ91D magnesium alloy was proposed, and the influences of cold working ratio, temperature and holding time on solid volume fraction, grain size and shape were investigated. The results show that, under the cold working condition, the SIMA process can produce the semi-solid material of magnesium alloy with minimum solid volume fraction of 55% after being held at 570℃ for definite time. The forming mechanism of semi-solid material of AZ91D magnesium alloy was analyzed. During the heat treatment, the recrystalization can occur, and the influence of re-crystallized structures is pronounced by cold working ratio.
Key words: AZ91D; cold working; SIMA; semi-solid; microstructure
