An Experimental Investigation on Microstructural, Mechanical and Biocompatibility Properties of Ti6Al4V Alloy Subjected to Equal Channel Angular Pressing Process

IF 2 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Engineering and Performance Pub Date : 2025-02-07 DOI:10.1007/s11665-025-10751-3

K. Ravikumar, S. Ganesan

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Abstract

The work is focused to study the strength of titanium grade5 alloy (Ti6Al4V) by equal channel angular pressing (ECAP) process through the grain refinement. The low density, corrosion resistance and biocompatibility properties of titanium alloy hold wide application in biomedical implants and other engineering applications. This paper demonstrates about ECAP of titanium grade 5 alloy up to four passes at room temperature. The microstructure, mechanical and bio-properties were analyzed. The yield strength was developed from 620 to 905 MPa and the ultimate tensile strength from 950 to 1200 MPa due to the grain refinement caused by the action of slip and twinning. The micro-hardness value was enhanced from 280 to 350 Hv because of accumulation of twinning and migration of grain boundaries. The enhanced strength due to the strain hardening through ECAP and the rapid formation of titanium oxide layer on the surface improved the corrosion resistance of Ti6Al4V alloy from 2.0 mm/year (as received) to 0.5 mm/year (ECAPed). The effect of ECAP on cyto-compatibility proved that the cell viability and original cell attachment were significantly developed due to the large amount of grain boundaries. It was verified that equal channel angular pressing process is an efficient method for the grain refinement in Ti6Al4V alloy and consequently enhancing its microstructural, mechanical and bio-properties.

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等通道角挤压Ti6Al4V合金组织、力学及生物相容性的实验研究

采用等径角挤压（ECAP）工艺，通过晶粒细化研究了5级钛合金（Ti6Al4V）的强度。钛合金具有低密度、耐腐蚀和生物相容性等特点，在生物医学植入物和其他工程领域有着广泛的应用前景。本文论述了5级钛合金在室温下四道次的ECAP。对其微观结构、力学性能和生物性能进行了分析。由于滑移和孪晶的作用，合金的屈服强度从620提高到905 MPa，极限抗拉强度从950提高到1200 MPa。由于孪晶的积累和晶界的迁移，显微硬度从280 Hv提高到350 Hv。通过ECAP的应变硬化和表面氧化钛层的快速形成使Ti6Al4V合金的耐蚀性从2.0 mm/年（收到）提高到0.5 mm/年（ECAP）。ECAP对细胞相容性的影响证明，由于大量的晶界，细胞活力和原始细胞附着显著增强。结果表明，等径角挤压工艺是一种有效的细化Ti6Al4V合金晶粒并提高其显微组织、力学性能和生物性能的方法。

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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来源期刊

Journal of Materials Engineering and Performance 工程技术-材料科学：综合

CiteScore

3.90

自引率

13.00%

发文量

1120

审稿时长

4.9 months

期刊介绍： ASM International''s Journal of Materials Engineering and Performance focuses on solving day-to-day engineering challenges, particularly those involving components for larger systems. The journal presents a clear understanding of relationships between materials selection, processing, applications and performance. The Journal of Materials Engineering covers all aspects of materials selection, design, processing, characterization and evaluation, including how to improve materials properties through processes and process control of casting, forming, heat treating, surface modification and coating, and fabrication. Testing and characterization (including mechanical and physical tests, NDE, metallography, failure analysis, corrosion resistance, chemical analysis, surface characterization, and microanalysis of surfaces, features and fractures), and industrial performance measurement are also covered