The formation of bimodal multilayered grain structure and its effect on the mechanical properties of powder metallurgy pure titanium

被引：26

作者：

Shen, J. ^{[1
]}

Chen, B. ^{[1
]}

Ye, X. ^{[1
]}

Imai, H. ^{[1
]}

Umeda, J. ^{[1
]}

Kondoh, K. ^{[1
]}

机构：

[1] Osaka Univ, Joining & Welding Res Inst, Suita, Osaka, Japan

来源：

MATERIALS & DESIGN | 2017年 / 116卷

关键词：

Titanium; Powder consolidation; Dynamic recystallization; Multilayer structure; Deformation twinning; SEVERE PLASTIC-DEFORMATION; NANOCRYSTALLINE; MICROSTRUCTURE; EXTRUSION; FLOW; SENSITIVITY; REFINEMENT; DUCTILITY; SHAPE; COLD;

D O I：

10.1016/j.matdes.2016.12.004

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In the present work, we report a novel bimodal and multi-layered grain structure in pure titanium produced via powder metallurgy. It was found that the hot-extruded pure Ti consists of multiple grain layers, which exhibited substantially different mean grain sizes. The microstructural development during hot extrusion was then investigated for the pure Ti via an interrupted extrusion experiment. The influence of this unique structure on the mechanical properties of the material was also studied under uniaxial quasi-static tension. The experimental results showed that the samples with different arrangement of the grain layers exhibited very different mechanical behavior. Namely, with combining a small part of fine grain layers, the material showed significantly increased yield strength and slightly decreased uniform plastic strain. Yet, the elongation-to-failure was decreased markedly for the multilayered material. Postmortem examinations indicated that this may attribute to the absence of deformation twins in the fine grains that leads to formation of microvoids, which finally develop into large cracks. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：99 / 108

页数：10

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