CAJ | 학술논문

采用合金法,利用XRD、SEM-EDS测定一系列Mg-Sn-Y三元合金在500 ℃下富Mg角处相平衡关系及各相平衡成分,建立Mg-Sn-Y三元系在500 ℃下富Mg角处的等温截面相图.结果表明:Mg-Sn-Y三元系富Mg角处存在Mg_2Sn、MgSnY、Sn_3Y_5和Mg_(24+x)Y_5 4种化合物与α-Mg固溶体平衡,从而构建3个三相区和4个两相区;Sn在α-Mg基体中的固溶度为2.5%～3.9%(摩尔分数),Y在α-Mg基体中的固溶度为1.1%,但二者不能同时固溶到α-Mg基体中,同时Sn_3Y_5相中大约可以固溶3.6%～4.1%的金属Mg;由于MgSnY和Sn_3Y_5等一些高熔点化合物在高温下能够稳定存在,使得Mg-Sn-Y体系有可能成为一种潜在的新型耐热镁合金.
채용합금법,이용XRD、SEM-EDS측정일계렬Mg-Sn-Y삼원합금재500 ℃하부Mg각처상평형관계급각상평형성분,건립Mg-Sn-Y삼원계재500 ℃하부Mg각처적등온절면상도.결과표명:Mg-Sn-Y삼원계부Mg각처존재Mg_2Sn、MgSnY、Sn_3Y_5화Mg_(24+x)Y_5 4충화합물여α-Mg고용체평형,종이구건3개삼상구화4개량상구;Sn재α-Mg기체중적고용도위2.5%～3.9%(마이분수),Y재α-Mg기체중적고용도위1.1%,단이자불능동시고용도α-Mg기체중,동시Sn_3Y_5상중대약가이고용3.6%～4.1%적금속Mg;유우MgSnY화Sn_3Y_5등일사고용점화합물재고온하능구은정존재,사득Mg-Sn-Y체계유가능성위일충잠재적신형내열미합금.
By equilibrated alloy method the phase equilibria relation and phase equilibria composition of the Mg-riched corner in the Mg-Sn-Y ternary system at 500 ℃ were determined by XRD and SEM-EDS, thus the isothermal section of this ternary system was constructed. The results show that four intermetallic compounds exist in equilibrium with the α-Mg solid solution, i.e. Mg_2Sn, MgSnY, Sn_3Y_5 and Mg_(24+x)Y_5. Therefore, three three-phase regions and four two-phase regions are constructed. The solubility of Sn and Y in the α-Mg solid solution are 2.5%-3.9% and 1.1% (mole fraction), respectively, but they can not be simultaneously soluted in α-Mg solid solution. In addition, about 3.6%-4.1% Mg is detected in the Sn_3Y_5 phase. Due to high thermal stability of the compounds such as MgSnY and Sn_3Y_5, it is thus expected that the Mg-Sn-Y-based alloy could be a promising creep resistant alloy by appropriate alloy design and processing.