Phase equilibria of the Mg-Sn-Ag system in Mg-rich corner at 320 and 400℃ were experimentally investigated with nine ternary alloys subjected to electron probe microanalysis and X-ray diffraction techniques.No ternar...Phase equilibria of the Mg-Sn-Ag system in Mg-rich corner at 320 and 400℃ were experimentally investigated with nine ternary alloys subjected to electron probe microanalysis and X-ray diffraction techniques.No ternary compounds were observed at both isothermal sections.Two three-phase triangles,i.e.hcp(Mg)+Mg_(2)Sn+Mg_(3)Ag and Mg_(2)Sn+Mg_(3)Ag+MgAg(bcc_B2),were both observed at 320 and 400℃.A new three-phase region of Ag3Sn+Mg2Sn+MgAg(bcc_B2)was additionally observed at 320℃,which implied that the binary phase Ag3Sn has a considerable solubility of Mg in the ternary system at the temperature.And the maximal solubility of Mg in Ag3Sn was measured to be 27.2 at.%.This result is not consistent with the thermodynamic calculated isothermal section at 350℃ from Wang et al.[11]and put forward a new requirement or refinement for the optimization of the Mg-Sn-Ag ternary system.At 400℃,the maximal solubility of Sn in the Mg3Ag phase was determined to be about 3.0 at.%Sn,and the solubility of Ag in Mg2Sn was negligible.The temperature of ternary eutectic reaction at Mg-rich corner(L↔hcp(Mg)+Mg_(54)Ag_(17)+Mg_(2)Sn)was measured by differential scanning calorimetry.The partial isothermal sections in Mg-rich corner of the ternary system at 320 and 400℃ were then constructed based on the above experimental data.展开更多
基金The financial support from National Key Research and Development Plan(No.2016YFB0701202)State Key Laboratory of Powder Metallurgy Central South University,China(No.1991DA105636),are greatly acknowledged.
文摘Phase equilibria of the Mg-Sn-Ag system in Mg-rich corner at 320 and 400℃ were experimentally investigated with nine ternary alloys subjected to electron probe microanalysis and X-ray diffraction techniques.No ternary compounds were observed at both isothermal sections.Two three-phase triangles,i.e.hcp(Mg)+Mg_(2)Sn+Mg_(3)Ag and Mg_(2)Sn+Mg_(3)Ag+MgAg(bcc_B2),were both observed at 320 and 400℃.A new three-phase region of Ag3Sn+Mg2Sn+MgAg(bcc_B2)was additionally observed at 320℃,which implied that the binary phase Ag3Sn has a considerable solubility of Mg in the ternary system at the temperature.And the maximal solubility of Mg in Ag3Sn was measured to be 27.2 at.%.This result is not consistent with the thermodynamic calculated isothermal section at 350℃ from Wang et al.[11]and put forward a new requirement or refinement for the optimization of the Mg-Sn-Ag ternary system.At 400℃,the maximal solubility of Sn in the Mg3Ag phase was determined to be about 3.0 at.%Sn,and the solubility of Ag in Mg2Sn was negligible.The temperature of ternary eutectic reaction at Mg-rich corner(L↔hcp(Mg)+Mg_(54)Ag_(17)+Mg_(2)Sn)was measured by differential scanning calorimetry.The partial isothermal sections in Mg-rich corner of the ternary system at 320 and 400℃ were then constructed based on the above experimental data.
