熔体超熔点高温处理对ZL114A凝固组织的影响  

Effects of Super-heat Treatment on the Solidification Microstructure and Subtle Structure in ZL114A Alloy

作　　者：陈亮[1] 张蓉[1] 张利民[1] 杨志怀[1] 崔文峰[1] 

机构地区：[1]西北工业大学理学院

出　　处：《特种铸造及有色合金》2009年第7期669-671,共3页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(50102004);航空科学基金资助项目(04G53048)

摘　　要：以ZL114A合金为研究对象,研究不同超熔点高温温度对其凝固组织和精细结构的影响。结果表明,经过925℃超温处理后,α-Al相枝晶明显细化,并且随着超温温度的升高,晶格常数随之增大,α-Al基体的位错密度和显微硬度得到提高,共晶硅相的尺寸逐渐减小,其形貌由针片状逐渐向球状转化。Effects of varied super-heated temperatures on the solidification microstructure and subtle structure in ZL114A alloy have been observed by OM (optical microscope) and SEM (scanning electron microscope) and XRD (X-ray diffraction). The results reveal that α-phase dendrite in the alloy can be greatly refined with super-heated treatment at 925℃. Furthermore,with increasing in temperatures,the lattice constant is increased and dislocation density and micro-hardness of the α-matrix are improved,meanwhile,the morphology of the α-phase is converted from acicular structure into spherical structure with decreasing in size of eutectic phase.

关 键 词：ZL114A α-Al 晶格常数 显微硬度 

分 类 号：TG146.2[一般工业技术—材料科学与工程]