(1. 安徽工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院，馬鞍山 243002；
2. 河南新鄉(xiāng)鐵路摩擦材料廠，新鄉(xiāng) 453002；
3. 無錫福鎂輕合金科技有限公司，無錫 214183)
摘 要: 采用Gleeble-3500熱力模擬試驗機在變形溫度300~450 ℃、應(yīng)變速率0.001~1 s-1條件下進行單軸壓縮試驗，研究ZX115(Mg-1.0%Zn-1.5%Ca(質(zhì)量分數(shù)))合金熱壓縮過程中的組織演變及再結(jié)晶形核機制。結(jié)果表明：ZX115合金在熱壓縮過程中發(fā)生了明顯的動態(tài)再結(jié)晶，再結(jié)晶晶粒尺寸隨著變形溫度的升高或應(yīng)變速率的降低而增大。合金在不同變形條件下的動態(tài)再結(jié)晶機制有所差異，主要有孿生動態(tài)再結(jié)晶、不連續(xù)動態(tài)再結(jié)晶和第二相粒子促進動態(tài)再結(jié)晶等方式。
關(guān)鍵字: 鎂合金；熱壓縮；動態(tài)再結(jié)晶；形核機制
（1. School of Materials Science and Engineering, Anhui University of Technology, Ma’anshan 243002, China;
2. Xinxiang Railway Friction Material Manufactory, Xinxiang 453002, China;
3. Wuxi Fumei Light Alloy Technology Co., Ltd, Wuxi 214183, China）
Abstract:The microstructure evolution and dynamic recrystallization (DRX) of ZX115 (Mg-1.0%Zn-1.5%Ca (mass fraction)) magnesium alloy during hot compression were studied. The uniaxial compression was conducted on a Gleeble-3500 simulator at different deformation temperatures (300-450 ℃) and strain rates (0.001-1 s-1). The results show that the DRX can be found in compressed ZX115 alloy during hot compressing. With the increase of the deformation temperatures or the decreases of the strain rates, the recrystallized grain size increases. Under different deformation conditions, the nucleation mechanism of dynamic recrystallization including twin induced nucleation, discontinuous nucleation, the second phase particle stimulated nucleation of DRX, and so on, can be found.
Key words: magnesium alloy; hot compression; dynamic recrystallization; nucleation mechanism
