W对γ-TiAl基合金单向凝固组织的影响  

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

作　　者：关兴举[1] 杨慧敏[2] 张莉[2] 田金华[2] 苏彦庆[2] 郭景杰[2] 傅恒志[2] 

机构地区：[1]吉林工业职业技术学院机电工程系 [2]哈尔滨工业大学材料科学与工程学院

出　　处：《特种铸造及有色合金》2009年第2期108-111,共4页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(NSFC50771041);教育部新世纪优秀人才支持计划资助项目(NCET05-0350)

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。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.

关 键 词：TIAL基合金 单向凝固 W 微观组织 

分 类 号：TG146.23[一般工业技术—材料科学与工程]