Combinatorial Effects of the Recipes of the Initial Gas-atomized Powder Sizes on Microstructure and Passivation Characteristics of the SLM-ed Ti-6Al-4V Bulk Alloys

IF 0.8 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science-medziagotyra Pub Date : 2023-02-24 DOI:10.5755/j02.ms.31220

Yu Zhang, Jiazhuo Lei, Z. Dan, Hui Chang, Lian Zhou

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引用次数: 0

Abstract

Bulk Ti-6Al-4V alloys have been fabricated by selective laser melting (SLM) in three recipes with different combinations of powder sizes. Combinatorial effects of initial gas-atomized powder sizes on microstructure and corrosion properties of SLM-ed Ti-6Al-4V alloys have been investigated by optical microscopy, X-ray diffraction, electrochemical measurements and surface free energy. The SLM-ed Ti-6Al-4V alloys are composed of acicular α' martensite and α phases. Many pinhole defects and twin boundaries exist in the SLM-ed Ti-6Al-4V alloys. According to electrochemical tests and surface free energy calculation, the SLM-ed Ti-6Al-4V alloys with 0 – 53 μm powders have the most positive corrosion potential, the lowest current density and the smallest surface free energy of 20.89 mJ m2. The passive film of SLM-ed Ti-6Al-4V alloys with 0 – 53 μm powders has superior protection ability due to their large thickness. The carrier concentration of SLM-ed Ti-6Al-4V alloys with 0 – 53 μm powders is the lowest by the Mott-Schottky curves. The SLM-ed samples with contact angles higher than 90º are hydrophobic, but the small contact angle of 46.98º reflects the hydrophilic features of as-rolled Ti-6Al-4V alloys. The combinatorial recipe of SLM-ed Ti-6Al-4V alloys with 0 – 53 μm powders is optimal for improvements on the corrosion resistance.

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初始气体雾化粉末尺寸配方对SLM化Ti-6Al-4V大块合金组织和钝化特性的组合影响

采用三种不同粉末尺寸组合的配方，通过选择性激光熔化（SLM）制备了大块Ti-6Al-4V合金。用光学显微镜、X射线衍射、电化学测量和表面自由能等方法研究了初始气体雾化粉末尺寸对SLM化Ti-6Al-4V合金微观结构和腐蚀性能的组合影响。SLM-ed Ti-6Al-4V合金由针状α′马氏体和α相组成。SLM-edTi-6Al-4V合金中存在许多针孔缺陷和孪晶边界。根据电化学测试和表面自由能计算，0–53μm粉末的SLM-ed Ti-6Al-4V合金具有最大的正腐蚀电位、最低的电流密度和最小的表面自由能，为20.89 mJ m2。0–53μm粉末SLM修饰的Ti-6Al-4V合金钝化膜厚度大，具有优异的保护能力。根据Mott-Schottky曲线，0–53μm粉末的SLM-ed Ti-6Al-4V合金的载流子浓度最低。接触角大于90º的SLM-ed样品具有疏水性，但46.98º的小接触角反映了轧制态Ti-6Al-4V合金的亲水性特征。SLM-ed Ti-6Al-4V合金与0–53μm粉末的组合配方对于提高耐腐蚀性是最佳的。

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来源期刊

Materials Science-medziagotyra 工程技术-材料科学：综合

CiteScore

1.70

自引率

10.00%

发文量

审稿时长

6-12 weeks

期刊介绍： It covers the fields of materials science concerning with the traditional engineering materials as well as advanced materials and technologies aiming at the implementation and industry applications. The variety of materials under consideration, contributes to the cooperation of scientists working in applied physics, chemistry, materials science and different fields of engineering.