Abstract

Three group of porous Ti4Al4Co samples made of (i) unmilled powder and vacuum sintered (S₁), (ii) milled powder and vacuum sintered (S₂), and (iii) milled powder sintered in open atmosphere (S₃) were prepared. Phase change, crystallite size and lattice strain variations due to powder milling and sintering were examined by SEM and XRD. To evaluate mechanical property, alloy samples were subjected to the uniaxial compression test. For corrosion analysis, Tafel plot was plotted using electrochemical corrosion system in simulated body fluid (SBF) as electrolytic medium. From the obtained results, it was found that significant microstructural transformation takes place due to milling and change in sintering atmosphere. Sample S₁ possessed 139 MPa compressive strength, which was about 48% and 76% higher than samples S₂ and S₃ respectively. Corrosion current density for S₃ was found as 5.5 ± 0.3 μA/cm² which is 7 and 12 times lower than S₂ and S₁ samples.

Graphic Abstract

中文翻译：

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机械合金化和烧结环境对多孔 Ti4Al4Co 合金的结晶演化、显微组织、力学和腐蚀性能的影响

摘要

制备三组多孔 Ti4Al4Co 样品，它们由 (i) 未研磨粉末和真空烧结 (S ₁ )、(ii) 研磨粉末和真空烧结 (S ₂ ) 和 (iii) 在开放气氛中烧结的研磨粉末 (S ₃ ) 制成. 通过SEM和XRD检查由于粉末研磨和烧结引起的相变、微晶尺寸和晶格应变变化。为了评估机械性能，合金样品进行了单轴压缩试验。对于腐蚀分析，使用模拟体液（SBF）中的电化学腐蚀系统作为电解介质绘制塔菲尔图。从获得的结果可以看出，由于铣削和烧结气氛的变化，显着的微观结构发生了转变。样品 S ₁具有 139 MPa 的抗压强度，分别比样品 S ₂和 S ₃高约 48% 和 76% 。发现S _{3 的}腐蚀电流密度为5.5 ± 0.3 μA/cm ²，比 S ₂和 S ₁样品低 7 倍和 12 倍。

图形摘要