金属熔融沉积成型制备7075铝合金的显微组织和力学性能
Micro structure and mechanical properties of 7075 aluminum alloy prepared by metal fused deposition modeling
孙亿 1易中怀 1沈廷 1熊慧文 1康潇 1张雷 1周科朝1
作者信息
- 1. 中南大学粉末冶金国家重点实验室,长沙 410083
- 折叠
摘要
以优化后的微晶蜡基喂料为原料,通过金属熔融沉积成型制备3D 7075 Al合金.通过热压实验评估蜡基黏合剂和粉末之间的亲和力,研究烧结铝合金的物相、形态演变、拉伸强度和摩擦性能.打印喂料表现出剪切变稀行为,可使熔融挤出过程变流畅,并获得较好表面质量且含少量层间堆积孔隙的3D坯件.在氮气中烧结铝合金的形态演变可分为4个阶段,包括500 ℃下Mg2Si和Si的沉淀,560 ℃以上Mg2Si的出现,合金粉末上氧化物层的氮化,以及620 ℃以上通过扩散过程增强的晶粒生长.3D 7075 Al合金的相对密度达95％,拉伸强度为120～141 MPa,拉伸应变为1.0％～2.5％.
Abstract
An optimized microcrystalline wax-based feedstock was used to fabricate 3D 7075 Al alloy through metal fused deposition modeling(Metal-FDM).The affinity between the wax-based binders and powders was evaluated by a hot-press experiment.The phases,morphology evolution,tensile strength and friction performance of the sintered Al alloy were studied.The feedstock displayed shear-thinning behavior for a smooth extrusion process,resulting in a satisfactory surface quality and minimal stacking pores in the 3D structure.The morphology evolution of Al alloy sintered in nitrogen could be divided into four stages,including the precipitation of fine Mg2Si and Si at 500 ℃,appearance of Mg2Si phase over 560 ℃,nitridation of the oxide layers on alloy powders and enhanced grain growth via the diffusion process over 620 ℃.The 3D 7075 Al alloys achieved a high relative density of 95％,exhibiting a tensile strength ranging from 120 to 141 MPa and a tensile strain of 1.0％-2.5％.
关键词
7075铝合金/金属熔融沉积成型/金属注射成型/显微组织演变/力学性能Key words
7075 aluminum alloy/metal fused deposition modeling/metal injection molding/microstructure evolution/mechanical property引用本文复制引用
基金项目
National Key Research and Development Program of China(2021YFB3701900)
出版年
2024
NETL
NSTL
万方数据