Deformation Behavior, Fatigue and Fracture Surface Microstructure of Porous Titanium Nickelid

Q3 Engineering

Micro and Nanosystems Pub Date : 2021-02-22 DOI:10.2174/1876402913666210222142150

E. Marchenko, Y. Yasenchuk, D. Avdeeva, G. Baigonakova, S. Gunther, M. Iuzhakova

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Abstract

The porous SHS–TiNi alloy is a widely used material for repairing defects in bone tissues. The objective of the study is to comprehensively investigate porous SHS–TiNi alloy samples for fatigue strength under cyclic bending, to study deformation characteristics under quasistatic tension and bending, and to carry out the fractographic analysis of fracture features. The study employed the electrospark method for cutting plates from a porous isotropic SHS–TiNi rod 30 mm in diameter and 300 mm in length. Deformation behaviour under tension and three-point bending of porous plates showed that porous samples undergo viscoelastic deformation due to the austenite–martensite (A→M) phase transformation. The fracture surfaces of elastic porous samples were studied by SEM. Microscopic studies of fracture surfaces revealed zones of quasi-brittle fracture of martensite and viscous fracture of austenite. The porous framework of intermetallic alloy exhibits a continuous brittle layer and numerous brittle non-metallic inclusions. However, successful fatigue tests showed that brittle phases and inclusions do not significantly affect deformation and fatigue characteristics of porous titanium nickelide. It was found that 70% of porous samples sustain 106 cycles of deformation without fracture due to reversible A→M→A phase transformations in the TiNi phase, which is one of the components of multiphase porous alloy. Viscoelastic behavior of the porous sample and its high fatigue strength under cyclic loading is due to reversible deformation of the TiNi phase. The corrosion-resistant layer of the porous framework allows an effective use of SHS–TiNi.

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多孔镍钛合金的变形行为、疲劳及断口组织

多孔SHS–TiNi合金是一种广泛应用于骨组织缺损修复的材料。本研究的目的是全面研究多孔SHS–TiNi合金样品在循环弯曲下的疲劳强度，研究准静态拉伸和弯曲下的变形特征，并对其断裂特征进行断口分析。该研究采用电火花法从直径30 mm、长度300 mm的多孔各向同性HS–TiNi棒上切割板材。多孔板在拉伸和三点弯曲下的变形行为表明，由于奥氏体-马氏体（A→M）相变。用扫描电镜对弹性多孔试样的断口进行了研究，断口微观形貌显示出马氏体的准脆性断裂区和奥氏体的粘性断裂区。金属间合金的多孔骨架呈现出连续的脆性层和大量的脆性非金属夹杂物。然而，成功的疲劳试验表明，脆性相和夹杂物对多孔钛镍内酯的变形和疲劳特性没有显著影响。研究发现，由于可逆A，70%的多孔样品能够承受106次变形而不断裂→M→作为多相多孔合金成分之一的TiNi相中的相变。多孔试样的粘弹性行为及其在循环载荷下的高疲劳强度是由于TiNi相的可逆变形引起的。多孔框架的耐腐蚀层允许SHS–TiNi的有效使用。

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

Micro and Nanosystems Engineering-Building and Construction

CiteScore

1.60

自引率

0.00%

发文量