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Effect of Sn Content on Phase Equilibrium and Formability
J. H. Won(원주현),J. C. Kim(김지찬),H. W. Lee(이현우),S. H. Min(민석홍),T. K. Ha(하태권) 한국소성가공학회 2015 한국소성가공학회 학술대회 논문집 Vol.2015 No.10
Feasibility of Zn-Al-Sn alloy for the application to fuse material of protection device in lithium-ion battery was tested in this study. The effect of tin contents on the microstructure and formability of Zn-Al-Sn alloy, which has also been attracting intensive focus as a Pb-free solder material, was investigated in this study. Phase equilibrium has been calculated by using FactSage® to evaluate the composition and fraction of equilibrium phases. In the case of Zn-4Al-XSn(X=1, 3, 5, 7, 9) alloys, melting temperatures were expected and measured to decrease from 392.1℃ to 374.3℃ with Tin contents increased from 1 to 9 weight percent. Cold rolling was successful conducted for all alloys with various Tin contents into the sheets with the sheets with thickness of 1.5 mm.
원주현(J. H. Won),박종민(J. M. Park),하태권(T. K. Ha) 한국소성가공학회 2014 한국소성가공학회 학술대회 논문집 Vol.2014 No.10
Phase equilibria of AZ91D Mg alloys for nonflammable use, containing Ca and Y, were carried out by using FactSage<SUP>Ⓡ</SUP> and FTL database, which revealed that solution treatment could be performed at temperatures from 400 to 450℃. Solid solution treatment of AZ91D Mg alloy without Ca and Y was successfully conducted at 420℃ and supersaturated microstructure with all beta phase resolved into matrix was obtained. In the case of AZ91D Mg alloy with some Ca and Y, however, a little amount of intermetallic particles were observed after solid solution treatment. After solid solution treatment, each alloy was annealed at temperatures of 180 and 200℃ for time intervals from 1 min to 48 hrs and hardness of each condition was measured by micro-Vickers method. Peak aging conditions were deduced as at the temperature of 200℃ for 10hrs.