论文部分内容阅读
采用超低速(0.05~0.9 m/s)压铸制备了ADC12合金样件,并对其进行了固溶时效热处理,研究了不同状态下合金的组织和力学性能。结果表明,在铸态下,超低速压铸ADC12合金具有高的力学性能,因为合金组织中共晶硅颗粒细小、圆整;该铸态合金能够进行热处理强化,经过固溶和时效热处理,合金强度和塑性较铸态有显著提高,因为合金组织中共晶硅颗粒更加球化,而且分布更均匀,金属间化合物从骨骼状逐渐粒化;170℃时效10 h后,其拉伸强度、屈服强度和伸长率较日本标准分别提高78.3%、104.0%和257.1%;而且在170~190℃,时效4~10 h,时效参数对强度的影响不显著;无论铸态还是热处理态,金属间化合物都是该材料断裂时的裂纹源。
The samples of ADC12 alloy were prepared by die-casting at ultra-low speed (0.05-0.9 m / s). The samples were treated by solution heat treatment and aging treatment. The microstructures and mechanical properties of the alloys were investigated. The results show that in the as-cast condition, the ultra-low speed die-casting ADC12 alloy has high mechanical properties because the eutectic silicon particles in the alloy structure are small and round. The as-cast alloy can be heat-treated and strengthened. After solution treatment and aging heat treatment, The plasticity is significantly higher than the as-cast state, because the eutectic silicon particles in the alloy structure are more spheroidized and more evenly distributed, and the intermetallic compounds are gradually granulated from the skeletal shape. After aging at 170 ° C for 10 h, the tensile strength, yield strength and elongation The results show that the aging rate is 78.3%, 104.0% and 257.1% higher than the Japanese standard, respectively. Moreover, aging at 170-190 ℃ for 4-10 h has no significant effect on the strength. The intermetallic compounds Crack source when the material breaks.