气体雾化Al-Zn-Mg-Cu铝合金粉末的形貌及组织性能研究  

Microstructure and mechanical properties of Al-Zn-Mg-Cu alloy powders prepared by gas atomization process

作　　者：王少卿[1] 于化顺[1] 王海涛[1] 张振亚[1] 闵光辉[1] 

机构地区：[1]山东大学材料液态结构及其遗传性教育部重点实验室,济南250061

出　　处：《粉末冶金技术》2010年第1期12-15,20,共5页Powder Metallurgy Technology

基　　金：山东省重点科技攻关项目(2006GG2203010)

摘　　要：利用氮气雾化法制备了Al-Zn-Mg-Cu合金粉末,通过扫描电镜、光学显微镜和X射线衍射仪对粉末的形貌及组织特征进行了研究;检测了粉末热挤压法制备的合金棒材的力学性能,并对其断口进行了分析。结果表明:随着粉末颗粒尺寸减小,颗粒形状由以长条形为主转变为以近球形为主。同时,显微组织中的枝晶臂间距减小,晶粒细化效果明显;合金以α-Al相为主,还有少量η-MgZn2平衡相存在。随粉末颗粒尺寸减小基体过饱和度增加,基体相和MgZn2相衍射峰宽化;粉末粒度减小,挤压合金力学性能提高;挤压合金拉伸断口属于韧性断裂。Al-Zn-Mg-Cu alloy powder was fabricated by nitrogen atomization process. The morphology and microstructure of powder, mechanical properties of extruded rods and fracture apperance were studied by scanning electronic microscope （ SEM ） , optical microscope （OM） and X-ray diffraction （XRD） . The result shows that morphology characteristics of powder changes from strip to near sphericity principally with decrease in size. At the same time, the dendritic arm spacing decrease, which is advantageous to grain refinement. The powder consist of a-Al and a spot of η-MgZn2 equilibrium phase, whose diffraction peaks broaden with decrease of powder size and increase of degree of supersaturation. The mechanical properties of consolidated rods increase with decrease of initial powder size. Fracture morphology is ductile rupture.

关 键 词：快速凝固 高强铝合金 形貌 组织 力学性能 

分 类 号：TF123.112[冶金工程—粉末冶金]