摘要
以4种不同粒径的球形Ti-6Al-4V粉末为原料,采用真空热压法进行成形固结。利用X射线衍射仪(XRD)、金相显微镜、扫描电镜、万能材料试验机分别分析粉末Ti-6Al-4V合金的物相组成、微观组织、断口形貌以及力学性能,研究粉末粒度及其组成对烧结体微观组织和力学性能的影响。研究结果表明:热压烧结Ti-6Al-4V样品致密度均可达到98%以上。不同粒度粉末烧结后的合金均为网篮排列层片状组织。合金塑性主要受原始粉末粒度影响,随原始粉末粒度增大,烧结样品的晶粒尺寸增大,从而导致合金的塑性降低。粉末粗细搭配相比于原始粗粉,有助于提高合金的塑性,从而有效降低粉末钛合金的成本。
Four kinds of spherical Ti-6Al-4V powders prepared by PREP method were vacuum hot pressed. The phase composition, microstructure, fracture morphology and mechanical properties of sintered samples were investigated by XRD, SEM and mechanical tests respectively. The effects of the particle size on microstructures and mechanical properties of Ti-6Al-4V alloy were studied. The results show that the relative density of sintered samples can reach more than 98%, and their microstructures are all basket-weave lamellar. The plasticity of the alloy is affected by the particle size. With the particle size increasing, the grain size of sintered samples increases, which results in the decrease of the ductility. Compared to the coarse powder, the powder mixed coarse and fine powders can improve the ductility of alloy, and thus to reduce the cost of powder Ti alloy prepared by hot press.
出处
《粉末冶金材料科学与工程》
北大核心
2016年第2期217-222,共6页
Materials Science and Engineering of Powder Metallurgy
基金
广州市产学研协同创新重大专项国际科技合作项目(2014J4500024)
