Compressive and fatigue behavior of beta-type titanium porous structures fabricated by electron beam melting

被引：290
作者：
Liu, Y. J. [1 ,2 ]
Wang, H. L. [2 ]
Li, S. J. [2 ]
Wang, S. G. [2 ]
Wang, W. J. [2 ]
Hou, W. T. [2 ]
Hao, Y. L. [2 ]
Yang, R. [2 ]
Zhang, L. C. [1 ]
机构：
[1] Edith Cowan Univ, Sch Engn, 270 Joondalup Dr, Perth, WA 6027, Australia
[2] Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, 72 Wenhua Rd, Shenyang 110016, Peoples R China
来源：
ACTA MATERIALIA | 2017年 / 126卷
基金：
中国国家自然科学基金; 澳大利亚研究理事会;
关键词：
Electron beam melting; Titanium alloys; Mechanical properties; Heat treatment; Porous structures; Super-elasticity; ELASTIC-DEFORMATION BEHAVIOR; MELTED TI-6AL-4V ALLOY; MECHANICAL-BEHAVIOR; BIOMEDICAL APPLICATIONS; CRACK-PROPAGATION; GRAIN-BOUNDARIES; TI; MICROSTRUCTURE; BIOMATERIALS; MANUFACTURE;
D O I：
10.1016/j.actamat.2016.12.052
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
beta-type titanium porous structure is a new class of solution for implant because it offers excellent combinations of high strength and low Young's modulus. This work investigated the influenceof porosity variation in electron beam melting (EBM)-produced beta-type Ti2448 alloy samples on the mechanical properties including super-elastic property, Young's modulus, compressive strength and fatigue properties. The relationship between the misorientation angle of adjacent grains and fatigue crack deflection behaviors was also observed. The super-elastic property is improved as the porosity of samples increases because of increasing tensile/compressive ratio. For the first time, the position of fatigue crack initiation is defined in stress-strain curves based on the variation of the fatigue cyclic loops. The unique manufacturing process of EBM results in the generation of different sizes of grains, and the apparent fatigue crack deflection occurs at the grain boundaries in the columnar grain zone due to substantial misorientation between adjacent grains. Compared with Ti-6Al-4V samples, the Ti2448 porous samples exhibit a higher normalized fatigue strength owing to super-elastic property, greater plastic zone ahead of the fatigue crack tip and the crack deflection behavior. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：58 / 66
页数：9
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