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采用温度记录仪测定砂型、金属型、水冷金属型和液氮冷却金属型在凝固阶段的平均冷却速度,分析冷却速度对GW 93镁合金铸态组织、相组成和力学性能的影响,建立合金的α(Mg)晶粒尺寸、硬度、抗拉强度、伸长率与凝固冷却速度的关系。结果表明,随着冷却速度的提高,α(Mg)等轴晶明显细化,第二相尺寸明显减小,分布更均匀,非平衡相Mg3Gd增多,α(Mg)等轴晶尺寸与冷却速度的关系公式为D=46.139 v-1/3。随着冷却速度的提高,合金抗拉强度、断后伸长率和硬度也明显提高。
The average cooling rate of sand, metal, water-cooled metal and liquid nitrogen cooling metal during the solidification stage was measured by temperature recorder. The effects of cooling rate on the as-cast microstructure, phase composition and mechanical properties of GW 93 magnesium alloy were analyzed. Relationship between α (Mg) Grain Size, Hardness, Tensile Strength, Elongation and Solidification Cooling Rate. The results show that with the increase of cooling rate, the equiaxed α (Mg) grains are obviously refined, the size of the second phase is obviously reduced, the distribution is more uniform, the amount of Mg3Gd in the unbalanced phase increases, the equiaxed grain size and cooling rate The relational formula is D = 46.139 v-1/3. With the increase of cooling rate, the tensile strength, elongation at break and hardness of the alloy also increased obviously.