喷射成形7XXX铝合金孔隙分布规律及其演变(英文)  

Distribution and Evolution of Porous Defects in Spray Formed 7XXX Aluminum Alloy

作　　者：尹贻彬[1,2] 张永安[1] 熊柏青[1] 王锋[1] 刘红伟[1] 李志辉[1] 李锡武[1] 

机构地区：[1]北京有色金属研究总院有色金属材料制备加工国家重点实验室,北京100088 [2]聊城大学,山东聊城252059

出　　处：《稀有金属材料与工程》2014年第12期2974-2979,共6页Rare Metal Materials and Engineering

基　　金：National Natural Science Foundation of China(51271037);National “973” Program of China(2011CB606303)

摘　　要：利用喷射成形技术制备了Al-10.8Zn-2.8Mg-1.9Cu-0.16Zr合金,通过金相显微镜和场发射扫描电镜研究了喷射成形合金的微观组织,总结了沉积坯中孔隙的形貌特点,分析了合金中孔隙的形成机制,并对热等静压和均匀化热处理对沉积坯缺陷的影响进行了研究。结果表明,沉积坯中的孔隙主要有搭接型孔隙、连通型孔隙和气孔,缺陷种类及分布与沉积坯位置有一定的关系,沉积坯芯部缺陷主要为搭接型孔隙和气孔,沉积坯边部连通型孔隙较多,尺寸较大。气孔内壁平滑内凹,形貌类似球形,其余孔隙为不规则形貌。热等静压处理可以消除气孔以外的其他孔隙,热处理后沉积坯中的气孔重新出现。Al-10.8Zn-2.SMg-1.9Cu-0.16Zr alloy was manufactured by the spray forming technique. Optical microscopy （OM） and field emission scanning electron microscopy （FESEM） were used to investigate microstructures of the spray-formed alloy. Morphology characteristics of all kinds of pores in as-deposited billet were summarized, and their formation mechanism in the alloy was studied. The influences of hot isostatic pressure treatment （HIP） and homogenizing treatment on porous defects in spray formed 7XXX aluminum alloy were studied. The results indicate that the porous defects in the spray-formed alloy are interstices, interlinked pores and gas pores. The distribution and types of porous defects are related with positions of the preform. The main defects in the center of the alloy perform are interstices and gas pores. More interconnected pores are located at the edge of as-deposited billet. The walls inside gas pores are smooth and concave, and the morphology of gas pores remains nearly spherical. Other porous defects show irregular geographies. HIP treatment can get rid of porous defects except for gas pores. Gas pores reappear after heat treatment because they are close pores actually.

关 键 词：喷射成形 7XXX铝合金 孔隙缺陷 

分 类 号：TG146.21[一般工业技术—材料科学与工程]