粉体特征对选区激光熔化Al-Si合金成型性能的影响  

Impact of powder characteristics on formation properties of selective laser melted Al-Si alloy

作　　者：王小军[1] 王修春[1] 伊希斌[1] 张晶[1] 

机构地区：[1]山东省科学院新材料研究所,山东济南250014

出　　处：《山东科学》2016年第2期30-35,共6页Shandong Science

基　　金：山东省信息产业发展专项

摘　　要：以Al-12Si、Al-10Si Mg、Al-7Si Mg、Al-5Si 4种Al-Si合金粉体为研究对象,分别对其颗粒形貌、粒径分布和流动性等物理性能进行了表征。在不同的工艺条件下进行了选区激光熔化(SLM)成型试验,获得了优化后的SLM工艺参数,并对成型后样品的致密度、微观形貌和断口形貌等特征进行了分析,系统研究了颗粒大小、形貌和分布等粉末特征对SLM成型性能的影响规律。结果表明,SLM成型过程中,粉体的颗粒形貌、分布以及流动性等物理特征对材料的成型性能影响很大。粉体的球形度、流动性越好,粒径分布越窄,SLM成型后样品的致密度越高,微观形貌中缺陷越少,成型性能越好。With four different Al-Si alloys Al-12Si, Al-iOSiMg, Al-7SiMg and Al-5Si as subjects, we characterized their physical properties of particle morphology, particle size distribution and fluidity. We conducted selective laser melting （SLM） formation experiment and acquired optimized SLM technology parameters. We also analyzed density, microstructure and fracture surface of formed samples. We further investigated the impact of such powder characteristics as particle size, morphology, and distribution on SLM formation properties. Results show that particle morphology, size distribution, flow ability of Al-Si powders will highly affect the SLM formation properties. The better sphericity and fluidity of Al-Si powders are, the less their particle size distribution scope is. The higher the density of SLM formed samples is, the less the defect in their microstructures is. Their formation property is therefore better.

关 键 词：粉体特征 选区激光熔化 AL-SI合金 成型性能 

分 类 号：TG456.7[金属学及工艺—焊接]