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26卷    第12期    总第213期    2016年12月

[PDF全文下载]    [Flash在线阅读]    

    

文章编号:1004-0609(2016)-12-2530-07
TiB2对TiAl基合金显微组织、力学性能及抗氧化性的影响
肖树龙1, 2,荆 科1,徐丽娟1,陈玉勇1, 2

(1. 哈尔滨工业大学 材料科学与工程学院,哈尔滨 150001;
2. 哈尔滨工业大学 金属精密热加工国家级重点实验室,哈尔滨 150001
)

摘 要: 采用水冷铜坩埚真空感应熔炼(ISM)技术制备β型TiAl合金Ti-45Al-2Nb-1.5V-1Mo-0.3Y(摩尔分数,%)及其复合材料Ti-45Al-2Nb-1.5V-1Mo-0.3Y(摩尔分数,%)+3%TiB2(体积分数)两种材料,并对TiAl合金及其复合材料的显微组织、力学性能和抗氧化性能进行研究。结果表明:加入TiB2后,TiAl合金中的晶粒尺寸和层片间距都得到细化,显微硬度、室温和高温抗拉强度提高,但室温伸长率略有下降,高温时复合材料表现出良好的塑性;800 ℃循环氧化100 h后,TiAl合金和复合材料氧化表面均保持完整,未产生剥落;加入TiB2后,导致两种材料表面氧化物的生长形态发生变化,但两种材料的氧化增量和氧化层厚度相近,因此,TiB2对氧化物的生长形态有影响,但对抗氧化性能影响不大。

 

关键词: TiAl合金;显微组织;力学性能;抗氧化性;TiB2

Effect of TiB2 on microstructure, mechanical properties and oxidation resistance of TiAl-based alloys
XIAO Shu-long1, 2, JING Ke1, XU Li-juan1, CHEN Yu-yong1, 2

1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;
2. National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, China

Abstract:TiAl-based alloy Ti-45Al-2Nb-1.5V-1Mo-0.3Y (mole fraction, %) and composites Ti-45Al-2Nb-1.5V-1Mo-0.3Y (mole fraction, %)+3%TiB2 (volume fraction) were prepared by induction skull melting (ISM). The microstructure, mechanical properties and oxidation resistance were studied. The results show that the composites exhibit much finer lamellar colony size and lamellar spacing compared with matrix. The micro-hardness and tensile fracture strength are improved at room temperature and 800 ℃, while the tensile elongation decreases at room temperature. The composites show good plastics at 800 ℃. After oxidation in air at 800 ℃ for 100 h, the oxidation surfaces of matrix and composites show good quality with no micro-cracks observed. The growth morphologies of matrix oxidation surface change compared with those of composites. But the mass gain and thickness of oxide scale of composites are almost the same as those of matrix. So, TiB2 has some influence on the growth morphologies of oxide scale, but nearly has no influence on the oxidation resistance.

 

Key words: TiAl-based alloy; microstructure; mechanical property; oxidation resistance; TiB2

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