(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: 采用高溫?cái)D壓的方法制備AZ31-0.4Nd合金管材，分析添加少量稀土元素Nd對(duì)AZ31合金擠壓管材織構(gòu)特征及力學(xué)性能的影響。結(jié)果表明：添加Nd有利于管材動(dòng)態(tài)再結(jié)晶的發(fā)生，再結(jié)晶晶粒細(xì)小且分布均勻；添加Nd改變了合金的織構(gòu)類型，弱化了基面織構(gòu)；擠壓管材縱向拉伸抗拉強(qiáng)度達(dá)236 MPa，伸長(zhǎng)率達(dá)10.5%；管材力學(xué)性能呈各向異性，其主要原因是沿TD方向拉伸時(shí)可開動(dòng)的基面滑移少、且利于 孿晶形成，從而使得沿TD方向拉伸時(shí)的抗拉強(qiáng)度較高而伸長(zhǎng)率較低。
關(guān)鍵字: AZ31-0.4Nd合金；稀土；織構(gòu)；力學(xué)性能；各向異性
（School of Materials Science and Engineering, Anhui University of Technology, Ma’anshan 243002, China）
Abstract:The AZ31-0.4Nd extruded tube was manufactured at elevated temperature, and the effects of the dilute addition of rare earth element Nd on the texture characteristic and mechanical properties were studied. The results show that the Nd addition contributes to the occurrence of dynamic recrystallization, resulting in the formation of fine recrystallized grains. The modification of texture characteristic and the weakening of basal plane texture can be achieved due to the Nd addition. The ultimate tensile stress is 236MPa and the elongation is 10.5% for the extruded tube. The tension test along the transverse direction shows a relatively higher stress and lower elongation. The primary reasons are due to a few activated basal plane slip systems and the formation of extension twinning in this tensile direction.
Key words: AZ31-0.4Nd alloy; rare element; texture; mechanical properties; anisotropy
