热处理对高真空压铸AlSi10MnMg合金拉伸性能的影响
Influence of Heat Treatment on Tensile Properties of High Vacuum Die Casted AlSi10MnMg Alloy
罗国健 1孙有平 2何江美 1刘华燊 1罗章1
作者信息
- 1. 广西科技大学机械与汽车工程学院,柳州 545006
- 2. 广西科技大学机械与汽车工程学院,柳州 545006;广西科技大学广西土方机械协同创新中心,柳州 545006;广西科技大学广西汽车零部件与整车技术重点实验室,柳州 545006
- 折叠
摘要
分别对高真空压铸AlSi10MnMg合金进行T5(180 ℃×2 h)、T6(515 ℃ × 1 h空冷+175 ℃×2 h)和T7(460 ℃×1 h水冷+175 ℃×2.5 h)热处理,研究了不同热处理条件下该合金的显微组织和拉伸性能.结果表明:经过T5热处理后的铸态试验合金铝基体相长大,圆整度较高,晶粒尺寸主要集中在20～80 μm,硅相仍呈细长状,与铸态试验合金相比,试验合金的抗拉强度提高了 8.9％,断后伸长率降低了 9.1％;经过T6和T7热处理后,铝基体相形状不规则程度降低,晶粒尺寸分别为2～50,2～30 μm,组织更均匀致密,硅相由铸态时的细长状演变为规则的圆形,试验合金的抗拉强度分别降低了 26.0％和23.9％,断后伸长率分别提高了 54.5％和72.7％;铸态和T5态试验合金的拉伸断裂方式均为韧脆混合断裂,T6和T7态试验合金的断裂方式则以韧性断裂为主,其中T7态试验合金拉伸断口中的韧窝细密且深,塑性更好.
Abstract
High vacuum die casted AlSi10MnMg alloy was treated by T5(180 ℃ ×2 h),T6(515 ℃ ×1 h air cooling+175 ℃×2 h)and T7(460 ℃ × 1 h water cooling+175 ℃ × 2.5 h)heat treatment,respectively.The microstructure and tensile properties of the alloy under different heat treatment conditions were studied.The results show that the aluminum matrix phase of the as-cast alloy grew after T5 heat treatment,the roundness was high,and the grain size was mainly concentrated in the range of 20-80 μm.The Si phase after T5 heat treatment was still a slender shap.Compared with those of the as-cast test alloy,the tensile strength of the test alloy increased by 8.9％and the percentage elongation after fracture was reduced by 9.1％after T5 heat treatment.After the heat treatment of T6 and T7,the irregular degree of aluminum matrix phase shape decreased,the grain size was 2-50,2-30 µm,respectively,and the microstructure was relatively uniform and dense.The Si phase changed from a slender shape in the cast state to a regular round shape.Compared with those of the as-cast test alloy,the tensile strength of the test alloy after T6 and T7 heat treatment was reduced by 26.0％and 23.9％,and the percentage elongation after fracture increased by 54.5％and 72.7％,respectively.The tensile fracture modes of the as-cast and T5 heat-treated test alloys were both tough-brittle mixed fracture.The fracture mode of the test alloys in T6 and T7 states were mainly ductile fracture,while the tough dimple in the tensile fracture of the T7 heat-treated test alloy was fine and deep,indicating better plasticity.
关键词
高真空压铸/AlSi10MnMg合金/热处理/显微组织/拉伸性能Key words
high vacuum die casting/AlSi10MnMg alloy/heat treatment/microstructure/tensile property引用本文复制引用
基金项目
广西壮族自治区重点研发计划(桂科AB23026104)
广西科技基地和人才专项(桂科AD22080042)
出版年
2024
NETL
NSTL
万方数据