反重力铸造对高强度铝合金凝固组织影响的研究  

Investigation on Effect of Counter Gravity Casting to Solidification Microstructure of High Strength Aluminum Alloys

作　　者：李新雷[1] 郝启堂[1] 介万奇[1] 

机构地区：[1]西北工业大学凝固技术国家重点实验室,陕西西安710072

出　　处：《中国材料进展》2010年第11期16-20,46,47,共7页Materials China

基　　金：国家973计划项目(2006CB605202)

摘　　要：采用反重力铸造方法生产高强度铝合金铸件已成为航空、航天领域内获得优质构件的重要途径。研究了反重力铸造对高强度铝合金ZL114A和ZL205A铸件凝固组织的影响。结果表明,合金的凝固组织存在着不同的位置效应,对于ZL114A合金铸件,冷端晶粒尺寸最小,靠近浇口处晶粒尺寸粗大。对于ZL205A合金铸件,随距浇口处距离的减少,枝晶间分布的网格状θ(A l2Cu)相逐渐由粗变细,α(Al)枝晶内分布的黑色点状T(Al12CuMn2)相逐渐减少。分析表明,在反重力铸造补缩压力相同的情况下,合金的凝固温度范围不同是造成凝固组织不同位置效应的主要原因。There are main approach which get high quality ports in aeronautical and astronautical industry to produce high strength aluminum alloy castings by counter gravity casting. Solidification microstructure of high strength aluminum alloy ZL114A and ZL205A castings under counter gravity casting process was investigated. The results indicate that the micro- structure with different solidification temperature range have different site effectiveness. The crystal grains of ZL114A alloy castings near the inner-gate of the castings are larger, while those at the cooling site of castings are fine. For ZL205A alloy casting, with decreasing of the distance of inner-gate site, θ（Al2Cu） phase distributed in α（Al） interdendritic become thinner gradually, T（Al12CuMn2） phase distributed inside of α（Al） grains also decrease. The investigation indicates that the site effectiveness is related to different solidification temperature of different alloy.

关 键 词：反重力铸造 高强度铝合金 凝固组织 

分 类 号：TG146.21[一般工业技术—材料科学与工程]