Ga对铸态Mg-x Al-2 Ga镁合金显微组织和力学性能的影响.pdfVIP

维普资讯 学兔兔 铸 造 Mar．2008 · 284· FOUNDRY VOI．57 NO．3 Ga对铸态Mg-x％AI一2％Ga镁合金显微组织和 力学性能的影响 伊 洋，孙 晶，杨 林，支I】 正 (沈阳工业大学材料科学与工程学院，辽宁沈阳110023) 摘要：研究了添加2％Ga对铸态-FMg-x％AI．2％Ga镁合金的显微组织和力学性能的影响。结果表明，镁铝合金中加入Ga， 可明显改善铸态组织，使p相由沿晶界呈断续网状分布变为块状分布，p相上的孔洞消失并得到明显细化，且在B相的周 围出现较多共晶组织；能谱分析表明，Ga主要存在于13相及13相与基体or．相交界处，也有少量固溶于or．固溶体中；Ga的加 入，可明显提高铸态下镁铝合金力学性能，Mg．8％AI．2％Ga镁合金抗拉强度可达248．4MPa、塑性可达10．4％。 关键词：Mg—A1合金；Ga；显微组织；力学性能 中图分类号：TG146．2 文献标识码：A 文章编号：1001—4977(2008)03—0284—04 ． I nfluences of Gallium on Microstructure and MechanicaI Properties of Mg-·x％AI-·2％Ga Alloys YI Yang，SUN Jing，YANG Lin，LIU Zheng (School of Materials Science and Engineering，Shenyang University of Technology， Shenyang 1 1 0023，Liaoning，China) Abstract：The influences of 2％Ga on the microstructure and mechanicaI properties of as-cast Mg．x％AI．2％Ga magnesium alloys were investigated．The results showed that the microstructure of magnesium alloy with 2％ Ga addition iS significantly improved，and the morphology of B—phase changes fr0m disc0ntinu0us network with cavities to bulk with smooth surface；eutectic emerges around 13．phase．The EDX analyzing results indicated that Ga exists mainly in B．phase and at the iunction of B-phase and a phase，also a Iittle in a-phase solid solution．Due to the addition of Ga，the mechanicaI properties of Mg-8％AI-2％Ga alloy are significantly improved；the tensile strength reaches 248．4 MPa．and the elongation iS 1 0．4％． Key WOrds：Mg-