(安徽工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院，馬鞍山 243002)
摘 要: 利用背散射電子衍射技術(shù)分析了Z1(Mg-1.0Zn(質(zhì)量分?jǐn)?shù)，%))和ZX115(Mg-1.0Zn-1.5Ca(質(zhì)量分?jǐn)?shù)，%))鎂合金熱壓縮變形后的顯微組織、織構(gòu)特征及再結(jié)晶晶粒的Schmid因子。結(jié)果表明：Ca的添加可以有效地細(xì)化動(dòng)態(tài)再結(jié)晶晶粒，固溶至基體的Ca降低鎂晶格軸比值，而未完全固溶的富Ca相在變形過(guò)程中破碎成粒子后促進(jìn)了再結(jié)晶形核，這些因素均有利于弱化合金形變織構(gòu)。隨著變形溫度的升高或應(yīng)變速率的降低，織構(gòu)強(qiáng)度隨之增加。再結(jié)晶晶粒的Schmid因子對(duì)變形溫度的變化較對(duì)應(yīng)變速率的變化更為敏感。
關(guān)鍵字: 鎂合金；熱壓縮；織構(gòu)；動(dòng)態(tài)再結(jié)晶；Schmid因子
（School of Materials Science and Engineering, Anhui University of Technology, Ma’anshan 243002, China）
Abstract:The microstructure, texture characteristics and Schmid factor of recrystallized grains of hot compressed Z1 (Mg-1.0Zn (mass fraction, %)) and ZX115 (Mg-1.0Zn-1.5Ca (mass fraction, %)) alloys were investigated by electron back-scattered diffraction. The results show that Ca addition contributes to the grain refinement due to the occurrence of dynamic recrystallization during the hot compression. Ca element is solution-treated into magnesium matrix, resulting in a relatively lower c/a axial ratio of crystal lattice than pure magnesium, and those undissovled Ca-rich phases are fractured to particles and then stimulate the recrystallization nucleation. Both of them promote the weakening of texture. The intensity of texture usually increases with increasing the temperature or decreasing the strain rate. The deformation temperature tends to have a stronger effect on the Schmid factor of recrystallized grains than strain rate.
Key words: magnesium alloy; hot compression; texture; dynamic recrystallization; Schmid factor
