(哈尔滨工业大学 材料科学与工程学院, 哈尔滨 150001)
摘 要: 通过热轧工艺制备了厚度为0.8mm的AZ31镁合金薄板。 在不同温度和应变速率条件下进行了单向拉伸试验。 在50~240℃的温度范围内, 采用平底杯形冲头拉深试验研究了成形温度、 拉深速度以及冲头温度对AZ31镁合金板热拉深工艺的影响。 结果表明: AZ31镁合金热轧薄板的RLD随温度的升高而明显增大; 在成形温度为200℃, 拉深速度为30mm/min的条件下, 最大RLD可达2.65, 相应的高径比为1.4, 证明AZ31镁合金板具有良好的热拉深性能; 此外, 拉深速度和冲头温度对AZ31镁合金的拉深成形也有重要影响。
关键字: AZ31镁合金; 拉深性能; 成形温度; 极限拉深比
(School of Material Science and Technology,
Harbin Institute of Technology, Harbin 150001, China)
Abstract:AZ31 magnesium alloy sheets with a thickness of 0.8mm were prepared through hot-rolling process. For the determination of the mechanical properties relevant to deep drawing of AZ31 magnesium alloy, uniaxial tensile tests were carried out under various temperatures and strain rates. Deep drawing tests for AZ31 magnesium alloy were conducted in a temperature range between 50℃ and 240℃. The effects of forming temperatures, deep drawing speeds and punch temperatures on deep drawing process were experimentally investigated. It is indicated that the limiting drawing ratio(RLD) significantly increases with the increase of temperatures. The maximum RLD can be raised up to 2.65 with the corresponding height-diameter ratio of 1.4 under a deep drawing speed of 30mm/min at 200℃, thus showing good formability of AZ31 magnesium alloy sheet. Further, deep drawing speeds and punch temperatures during deep drawing process can also exert significant influence on the deep drawing of AZ31 magnesium alloy.
Key words: AZ31 magnesium alloy; deep drawability; forming temperature; limiting drawing ratio