(1. 上海大學(xué) 材料與工程學(xué)院，上海 200072;
2. 北京維恩克集團(tuán)臨沂公司，濟(jì)南 273400)
摘 要: 通過電磁連鑄和普通連鑄方法對AZ31鎂合金進(jìn)行連鑄實驗，對比分析有、無電磁場作用下的鑄坯凝固宏觀、微觀組織和力學(xué)性能，并利用掃描電鏡分析鎂合金的斷裂機(jī)理。結(jié)果表明：當(dāng)表觀直流電流為40~50 A時獲得最佳磁場分布，此時電磁連鑄的鎂合金組織細(xì)小、均勻，樹枝晶呈破碎狀，其力學(xué)性能尤其是塑性變形能力顯著提高，常溫抗拉強(qiáng)度、屈服強(qiáng)度和伸長率較普通連鑄分別提高17％，50％和81％，斷口形貌顯示其斷裂具有韌性斷裂的特性。
關(guān)鍵字: AZ31鎂合金；電磁連鑄；凝固組織；力學(xué)性能
on structure and mechanical properties of
magnesium alloy AZ31
（1. School of Materials and Engineering, Shanghai University,Shanghai 200072, China;
2. Beijing Winca Group Co. Ltd., Ji’nan 273400, China）
Abstract:A test of electromagnetically continuous casting (EMC) was used to cast AZ31 alloy to study the effect of electromagnetic field on the billets, in which the solidification structure and mechanical properties of the billets cast with or without electromagnetic field were examined. The result shows that the optimum distribution of magnetic induction intensity is obtained at the apparent direct current of 40−50 A, and the grain size obtained by EMC is fine and uniform, the dendritic crystal are fragmentated. The mechanical properties of the billet casted by EMC are improved obviously compared with those casted by the traditional casting, and the tensile strength, yield strength and elongation are increased by about 17%, 50% and 81%, respectively. AZ31 magnesium alloy casted by EMC usually shows flexible fracture.
Key words: AZ31 magnesium alloy; electromagnetically continuous casting; solidification structure; mechanical property
