Features of Microstructural Evolution and Corrosion Behavior of Ti6Al4V Titanium Alloy Fabricated from Elemental Powder Blends

Key Engineering Materials Pub Date : 2024-02-09 DOI:10.4028/p-gvgzk5

Serhii Lavrys, Iryna Pohrelyuk, D. Savvakin, Khrystyna Shliakhetka, M. Danyliak

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Abstract

Sintered Ti6Al4V titanium alloys prepared from TiH2/60Al40V powder blends under various technological conditions were studied. The microstructural evolution was investigated by X-ray diffraction, scanning electron microscopy, optical microscopy, and energy dispersive X-ray analysis. The corrosion resistance of sintered titanium alloy was evaluated by the static immersion test in 40 wt.% H2SO4 acid, according to ASTM standard G31-72(2004). Depending on powder metallurgy processing parameters (compaction pressure or sintering temperature), the Ti6Al4V alloy was obtained with various structural features (porosity and structural heterogeneity). It was shown that those structural features of sintered Ti6Al4V titanium alloy are a key microstructural factor that determines their corrosion resistance. For instance, an increase in porosity leads to enhanced corrosion resistance. Based on the current research, the optimal manufacturing regimes of powder metallurgy of Ti6Al4V titanium alloy ensure the achievement of characteristics sufficient for practical use in aggressive conditions of the chemical industry were obtained.

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用元素粉末混合物制造的 Ti6Al4V 钛合金的微结构演变和腐蚀行为特征

研究了由 TiH2/60Al40V 粉末混合物在不同工艺条件下制备的烧结 Ti6Al4V 钛合金。通过 X 射线衍射、扫描电子显微镜、光学显微镜和能量色散 X 射线分析研究了微观结构的演变。根据 ASTM 标准 G31-72（2004），通过在 40 wt.% H2SO4 酸中的静态浸泡试验评估了烧结钛合金的耐腐蚀性。根据不同的粉末冶金加工参数（压实压力或烧结温度），得到的 Ti6Al4V 合金具有不同的结构特征（孔隙率和结构异质性）。研究表明，烧结 Ti6Al4V 钛合金的这些结构特征是决定其耐腐蚀性的关键微结构因素。例如，孔隙率的增加会导致耐腐蚀性的增强。在当前研究的基础上，获得了 Ti6Al4V 钛合金粉末冶金的最佳制造机制，以确保获得足以在化学工业侵蚀性条件下实际使用的特性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Key Engineering Materials

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