摘要
提出了液相线半连续铸造制备铝合金半固态浆的新工艺 ,研究了液相线半连续铸造 70 75合金的微观组织及其在二次加热过程中的变化。在液相线温度下 (90 8K)半连续铸造的 70 75合金组织为均匀、细小的蔷薇状组织 ,晶粒平均等积圆直径为 2 9.7μm ,晶粒平均圆度为 1.87。经二次加热后 ,铸造组织逐渐转变为等轴晶。在849K下加热 6 0min后 ,晶粒平均等积圆直径为 5 7.6 μm ,平均圆度为 1.49。在 86 9K下加热 30min后 ,晶粒平均等积圆直径为 47.2 μm ,平均圆度为 1.5 4。结果表明 ,液相线半连续铸造可以获得理想的 70
A new process, liquidus semi continuous casting(LSC) to produce semi solid slurries of aluminum alloy, was presented. The casting and remelted microstructures of 7075 alloy cast by LSC were studied. The microstructures cast at liquidus temperature(908?K) by LSC is uniform, fine and rose flowered. The average equal area circle grain diameter is 29.7 μm and the average roundness is 1.87. The casting microstructures are gradually turned into equiaxed grains by being remelted. After the casting billet are soaked at 849 K for 60 min, the average equal area circle grain diameter is 57.6 μm and the average roundness is 1.49. After the casting billet is soaked at 869 K for 30 min, the average equal area circle grain diameter is 47.2 μm and the average roundness is 1.54. The results show that fine semi solid slurries of 7075 alloy can be obtained by LSC. [
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2001年第2期211-215,共5页
The Chinese Journal of Nonferrous Metals
基金
国家自然科学基金资助项目! (5 99740 0 9)
关键词
液相线铸造
半连续铸造
铝合金
二次加热
组织
liquidus casting
semi continuous casting
semi solid
Al alloy
non dendrite
