(1. 上海交通大學 輕合金精密成型國家工程研究中心，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 金屬基復合材料國家重點實驗室,上海200030)
摘 要: 研究不同擠壓工藝條件對ME20M鎂合金組織和力學性能的影響。結果表明：擠壓工藝參數的變化對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單質顆粒吸附Mg12Ce現象，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量，利用其強化作用實現抗拉強度超過250 MPa、伸長率超過10%型材的工業(yè)化生產。
關鍵字: ME20M鎂合金；擠壓溫度；推進速度；顯微組織；力學性能；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
