Stir zone microstructure of commercial purity titanium friction stir welded using pcBN tool

被引：127

作者：

Zhang, Yu ^{[1
]}

Sato, Yutaka S. ^{[1
]}

Kokawa, Hiroyuki ^{[1
]}

Park, Seung Hwan C. ^{[2
]}

Hirano, Satoshi ^{[2
]}

机构：

[1] Tohoku Univ, Grad Sch Engn, Dept Mat Proc, Aoba Ku, Sendai, Miyagi 9808579, Japan

[2] Hitachi Ltd, Hitachi Res Lab, Hitachi, Ibaraki 3191292, Japan

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2008年 / 488卷 / 1-2期

关键词：

friction stir welding; commercial purity titanium; allotropic transformation; pcBN; microstructure;

D O I：

10.1016/j.msea.2007.10.062

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

In the present study, friction stir welding was applied to commercial purity titanium using a polycrystalline cubic boron nitride tool, and microstructure and hardness in the weld were examined. Additionally, the microstructural evolution during friction stir welding was also discussed. The stir zone consisted of fine equiaxed alpha grains surrounded by serrate grain boundaries, which were produced through the beta ->alpha allotropic transformation during the cooling cycle of friction stir welding. The fine a grains caused higher hardness than that in the base material. A lath-shaped alpha grain structure containing Ti borides and tool debris was observed in the surface region of the stir zone, whose hardness was the highest in the weld. (C) 2007 Elsevier B.V. All rights reserved.

引用

页码：25 / 30

页数：6

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