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分析铸态和压铸态Mg-6.02Al-1.03Sm、Mg-6.05Al-0.98Sm-0.56Bi和Mg-5.95Al-1.01Sm-0.57Zn合金的显微组织和相组成,测试其拉伸力学性能与流动性能。结果表明,Mg-6.02Al-1.03Sm合金铸态组织由δ-Mg基体、半连续的δ-Mg17Al12相和高热稳定性的小块状Al2Sm相组成。添加Bi后生成杆状Mg3Bi2相,而添加的Zn固溶于δ-Mg基体和δ-Mg17Al12相中。铸态合金呈现优异的拉伸力学性能,室温时其抗拉强度(δb)和伸长率(δ)分别达到205~235 MPa和8.5%~16.0%,而423 K时分别超过160 MPa和14.0%。压铸态组织明显细化,第二相发生破碎,且弥散分布。压铸态合金呈现更高的拉伸力学性能和优异的流动性能,室温δb和δ分别达到240~285 MPa和8.5%~16.5%,流动长度可达1870~2420 mm。压铸态室温拉伸断口呈现明显的断裂特征。
The microstructures and phase compositions of as-cast and as-cast Mg-6.02Al-1.03Sm, Mg-6.05Al-0.98Sm-0.56Bi and Mg-5.95Al-1.01Sm-0.57Zn alloys were analyzed and their tensile mechanical properties With mobile performance. The results show that the as-cast microstructure of Mg-6.02Al-1.03Sm alloy is composed of δ-Mg matrix, semicontinuous δ-Mg17Al12 phase and high thermal stability small Al2Sm phase. After the addition of Bi, a rod-like Mg3Bi2 phase was formed, while the added Zn was dissolved in the δ-Mg matrix and the δ-Mg17Al12 phase. The as-cast alloys exhibit excellent tensile mechanical properties with tensile strength (δb) and elongation (δ) of 205-235 MPa and 8.5-16.0% at room temperature respectively over 160 MPa and 14.0% at 423 K, . The as-cast microstructure is obviously refined, the second phase is broken, and dispersed. The as-cast alloys show higher tensile mechanical properties and excellent flow properties. The room temperature δb and δ are 240 ~ 285 MPa and 8.5% ~ 16.5% respectively, and the flow length can reach 1870 ~ 2420 mm. The tensile fracture at room temperature of die-cast showed obvious fracture characteristics.