(1. 上海交通大學(xué) 輕合金精密成型國(guó)家工程研究中心，上海 200030;
2. 上海美格力輕合金有限公司，上海 201615;
3. 上海交通大學(xué) 金屬基復(fù)合材料國(guó)家重點(diǎn)實(shí)驗(yàn)室,上海200030)
摘 要: 研究不同擠壓工藝條件對(duì)ME20M鎂合金組織和力學(xué)性能的影響。結(jié)果表明：擠壓工藝參數(shù)的變化對(duì)ME20M的晶粒尺寸和組織均勻性具有較大的影響，存在主要第二相Mn單質(zhì)顆粒吸附Mg12Ce現(xiàn)象，其吸附量隨Mn顆粒分布位置的變化而變化，造成Mg12Ce分布不均，成為制約ME20M合金組織性能改善的主要因素之一。主要通過合理控溫、控速等擠壓工藝控制擠壓纖維組織的分布與數(shù)量，利用其強(qiáng)化作用實(shí)現(xiàn)抗拉強(qiáng)度超過250 MPa、伸長(zhǎng)率超過10%型材的工業(yè)化生產(chǎn)。
關(guān)鍵字: ME20M鎂合金；擠壓溫度；推進(jìn)速度；顯微組織；力學(xué)性能；斷口
mechanical properties of ME20M magnesium alloy
（1. Light Alloy Net Forming National Engineering Research Center, Shanghai Jiaotong University, Shanghai 200030, China;
2. Shanghai Magnesium Alloy Co., Ltd, Shanghai 201615, China;
3. State Key Laboratory of Metal Matrix Composites, Shanghai Jiaotong University, Shanghai 200030，China）
Abstract:The effect of various extrusion process conditions on the microstructure and mechanical properties of ME20M magnesium alloy was studied. The results show that the grain size and structure uniformity of ME20M magnesium alloy are greatly affected by the extrusion process parameters. Furthermore, Mg12Ce can be absorbed by Mn(the main second phase), and the quantity of absorption varies according to the location of Mn particles. This will lead to non-uniform of Mg12Ce, which greatly restricts the development of the properties of ME20M magnesium alloy. By controlling extruding temperature and speed, the distribution and quantity of fibrous structure can be perfectly controlled. The profile that ultra tensile strength is above 250 MPa and elongation is above 10% can be realized by strengthening the effect of fibrous structure in industry production.
Key words: ME20M magnesium alloy; extruding temperature; ram speed; microstructure; mechanical properties; fracture
