Effects of W on the Unidirectional Solidification Structures of TiAl Based Alloy

Guan Xingju1; Yang Huimin2; Zhang Li2; Tian Jinhua2; Su Yanqing2; Guo Jingjie2; Fu Hengzhi2

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Effects of W on the Unidirectional Solidification Structures of TiAl Based Alloy
Vol. 29, Issue 2, Pages: 108-111(2009)
Published： 2009 ，
DOI：

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[1]关兴举,杨慧敏,张莉,田金华,苏彦庆,郭景杰,傅恒志.W对γ-TiAl基合金单向凝固组织的影响[J].特种铸造及有色合金,2009,29(02):108-111+91-92.

Guan Xingju1, Yang Huimin2, Zhang Li2, et al. Effects of W on the Unidirectional Solidification Structures of TiAl Based Alloy. [J]. Special Casting & Nonferrous Alloys 29(2):108-111(2009)
[1]关兴举,杨慧敏,张莉,田金华,苏彦庆,郭景杰,傅恒志.W对γ-TiAl基合金单向凝固组织的影响[J].特种铸造及有色合金,2009,29(02):108-111+91-92. DOI：

Guan Xingju1, Yang Huimin2, Zhang Li2, et al. Effects of W on the Unidirectional Solidification Structures of TiAl Based Alloy. [J]. Special Casting & Nonferrous Alloys 29(2):108-111(2009) DOI：

摘要

采用电弧熔炼并直接在冷坩埚中凝固

得到了具有单向凝固特征的TiAl合金纽扣锭

以此研究了合金元素W对单向凝固组织的影响。结果表明

W对TiAl合金单向凝固的枝晶组织有细化作用

当W含量为2.5%时

可以将凝固组织的晶粒宽度减小到200μm

二次枝晶间距减小到50μm。随着W含量的增加

先凝固形成的β相晶粒内部出现网络分布的富W相

并最终转变为B2相。Ti-46Al合金中加入W元素后

片层团尺寸及片层厚度减小。

Abstract

Effects of W on the unidirectional solidification structures of TiAl based alloy which was prepared by solidifying in a cold crucible after non-consumable arc melting were observed.The results indicate that dendrite in the TiAl based alloy can be greatly refined with W additon

in which grain size can be decreased to approximately 50μm with 2% W addition.With increasing in W addition

net-like W-rich phase appear in the primary β phase

and it is transformed into B2 phase.In addition

lamellar colony size can be decreased in the Ti-46Al alloy with W addition.