变形量对应变诱导熔化激活法制备CuSn10P1合金半固态组织的影响

摘要

Semi­solid CuSn10P1 alloy billets were fabricated by strain induced melt activation (SIMA) method including the forging and remelting processes. Firstly, CuSn10P1 billets were annealed and forged. Secondly, the billets were reheated to 850℃or 950℃, and hold for 5 min. Finally, the billets were water quenched, and semi­solid microstructures of CuSn10P1 alloy were obtained. The microstructures of semi­solid CuSn10P1 alloy with different stages were observed by OM and SEM. The solid fractions of the semi­solid microstructure were computed. The effects of deformation and remelting temperature on the microstructures of semi­solid CuSn10P1 alloy were investigated. The results indicate that dendritic structure of CuSn10P1 billets is eliminated, and equiaxed grains ofαphase are obtained after annealing at 680℃ for 24 h. The solid fraction of semi­solid CuSn10P1 microstructure decreases with the increase of the deformation. With the increase of the deformation from 8.4% to 21.9%, the solid fraction decreases from 70.15% to 57.83% by remelting at 850 ℃, and the solid fraction decreases from 58.79% to 53.10% by remelting at 950℃. The higher the remelting temperature is, the smaller the effect of deformation on solid fraction is.%采用锻造与重熔加热的应变诱导熔化激活(SIMA)法制备CuSn10P1合金半固态坯料，先对CuSn10P1铸锭进行退火处理，再对其进行锻造变形，然后对试样进行850及950℃保温5 min-水淬处理，获得CuSn10P1半固态坯料。采用金相显微镜和扫描电镜观察各阶段试样组织形貌，计算半固态组织的固相分数，分析变形量和重熔温度对CuSn10P1半固态组织的影响。结果表明：CuSn10P1合金铸锭经680℃、24 h退火后，消除了枝晶组织，获得了以α相为主的等轴晶组织。CuSn10P1合金半固态组织固相分数随变形量的增加而降低，当变形量从8.4%增加至21.9%经850℃重熔时，固相分数从70.15%降低至57.83%；950℃重熔时，固相分数从58.79%降低至53.10%。重熔温度越高，变形量对固相分数变化程度影响越小。