Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

您目前所在的位置:首页 - 期刊简介 - 详细页面

中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第18卷    第5期    总第110期    2008年5月

[PDF全文下载]        

    

文章编号:1004-0609(2008)05-0799-06
高能喷丸TA17近α钛合金晶粒细化机制
韩 靖,盛光敏,胡国雄

(重庆大学 材料科学与工程学院,重庆 400044)

摘 要: 为研究TA17α钛合金在高能喷丸(HESP)过程中的晶粒细化机制,采用高能喷丸对TA17α钛合金棒材端面进行处理,利用光学显微镜(OM)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)X射线衍射仪对喷丸变形层组织进行表征,按照变形层中不同深度的组织特征对晶粒细化机制进行探讨。结果表明:在喷丸表面形成35 nm左右的等轴纳米晶,在孪晶形成层中粗晶内形成较厚的孪晶薄片,在过渡层中位错滑移使孪晶薄片内生成小角度取向的亚晶,在纳米层中亚晶被转变成随机取向的等轴纳米晶。

 

关键字: 钛合金;高能喷丸;纳米晶;孪生;位错

Mechanism of grain refinement for TA17 near α Ti alloy by high energy shot peening
HAN Jing, SHENG Guang-min, HU Guo-xiong

College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China

Abstract:In order to research the mechanism of grain refinement in TA17 near α Ti alloy, the cross section surface of TA17 near α Ti alloy bars were treated by high energy shot peening(HESP). The microstructures feature in plastic deformation layer were characterized and researched by optical microscopy(OM), scanning electron microscopy(SEM), transmission electron microscopy(TEM) and X-ray diffraction(XRD). The grain refinement mechanism was researched according to different depth microstructures feature in the deformation layer. The results show that the equiaxed nanograins with about 35 nm are synthesized on the peening surface. In the twin forming layer, the twin lamellas are generated in coarse grains. In the transition layer, twin lamellars are transformed into with small angle by dislocation slip. And in the nanometer crystalline grain layer, subgrain are transformed into randomly oriented equiaxed nanograins.

 

Key words: titanium alloy; high energy shot peening; nanograin; twin; dislocation slip

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

主管:中国科学技术协会 主办:中国有色金属学会 承办:中南大学
湘ICP备09001153号 版权所有:《中国有色金属学报》编辑部
------------------------------------------------------------------------------------------
地 址:湖南省长沙市岳麓山中南大学内 邮编:410083
电 话:0731-88876765,88877197,88830410   传真:0731-88877197   电子邮箱:f_ysxb@163.com