冷却速度对ZM5镁合金凝固组织与性能的影响

发布时间：2018-03-23 02:13

  本文选题：冷却速度　切入点：晶粒尺寸　出处：《铸造》2017年03期 　论文类型：期刊论文

【摘要】：采用温度采集仪测定砂型(含20 mm厚的冷铁和10 mm厚的冷铁)、金属型(铜模和钢模)在镁合金凝固阶段的平均冷却速率,分析了冷却速度对ZM5镁合金铸态组织、相组成和力学性能的影响,以获得铸锭晶粒尺寸、抗拉强度、硬度与凝固冷却速度之间的影响关系。研究结果表明,在砂型Ⅲ区(含10 mm厚的冷铁)条件下,其冷却速度最慢,为2.94℃/s;在金属型铜模铸造条件下,其冷却速度最快,为7.88℃/s。ZM5镁合金其微观组织主要是α-Mg和第二相Mg_(17)Al_(12)。随着冷却速度的不断提高,镁合金晶粒明显细化,第二相分布更加弥散、均匀,合金的硬度、抗拉强度和伸长率也明显提高。
[Abstract]:The average cooling rate of sand mould (containing 20 mm thick cold iron and 10 mm thick cold iron) and metal (copper mould and steel die) during solidification stage of magnesium alloy was measured by temperature collector. The effect of cooling rate on the as-cast microstructure of ZM5 magnesium alloy was analyzed. The effects of phase composition and mechanical properties on the effect of grain size, tensile strength, hardness and solidification cooling rate on the ingot were obtained. The results show that the cooling rate is the slowest under the condition of sand mold 鈪，

本文编号：1651435