Transactions of Materials and Heat Treatment

Title：Effect of heating temperature on microstructure and properties of AZ31 magnesium alloy in CONFORM process

Authors： Yang Junying Gao Fei Ning Haishi Song Baoyun

Unit： Dalian Jiaotong University CSR Qingdao Sifang Locomotive and Rolling Stock Co. Ltd.

KeyWords： CONFORM AZ31 magnesium alloy microstructure mechanical property

ClassificationCode：TG379

year,vol(issue):pagenumber：2014,39(5):106-110

Abstract：

The process experiment of AZ31 magnesium alloy was carried out using the continuous extrusion forming process (CONFORM). The effect of heating temperature on the microstructure and mechanical properties was investigated. The results show that the effect of heating temperature on the microstructure of AZ31 magnesium alloy is obvious. Grains are uniform and fine in the core region and grain size is inhomogeneous in the surface region when the extrusion of billet is done at room temperature. With the increase of heating temperature, the uniformity of microstructure increases. The grains in the core region have grown up when the billet heating temperature is 450 ℃. The grain refinement is obviously realized comparing to billet after CONFORM process. The reason is that the billet suffers multiple deformations during CONFORM process which leads to the grain refinement. The tensile strength increases and the elongation does not change significantly with heating temperature increasing. This is due to that the proper improvement of temperature induces sufficient recrystallization and improves the grain uniformity.

Funds：

辽宁省自然科学基金资助项目（2013020135）；辽宁省教育厅项目（L2013186）

杨俊英（1981-），女，博士，副教授

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