扩散时间对W在TiAl合金中扩散行为的影响

doi:10.13251/j.issn.0254-6051.2020.11.018

摘要/Abstract

摘要： 通过光学显微镜、扫描电镜和硬度测试等分析手段研究了在1250 ℃下扩散保温不同时间对W元素在TiAl合金中扩散行为的影响。结果表明:试样在1250 ℃下进行扩散不同时间后,渗层界面处连接良好,可观察到明显的冶金结合。扩散层厚度随扩散时间的延长而增加,扩散4 h后可得到约15 μm厚的渗层,扩散24 h后可得到约45 μm厚的渗层,此外较长的扩散时间(24 h)可显著改善界面处的裂纹和气孔等缺陷。W在TiAl合金中的扩散机制主要为置换和空位扩散,且W和Ti的原子半径和热膨胀系数等存在差异,使得晶格畸变的出现并进一步阻碍了W元素的扩散。显微硬度试验结果表明W在TiAl合金中进行扩散,可以增强TiAl合金的硬度,且硬度值随W含量的增大而增大。

关键词: 钛铝合金, 扩散机理, 扩散连接, 钨

Abstract: Effect of holding time on diffusion behavior of tungsten in TiAl alloy under 1250 ℃ was studied by means of OM, SEM, and hardness test. The results show that, the interface between specimens have good combination after diffusion at 1250 ℃ for different time, which shows obvious metallurgical bonding. And the thickness of diffusion layers increases with increasing time, thus the thickness of diffusion layer after diffusion for 4 h is about 15 μm, and that for 24 h is about 45 μm. In addition, the defects such as cracks and pore at the interface can be inhibited by prolonging diffusion time (24 h). The replacement and vacancy diffusion are the main diffusion mechanisms of tungsten in the TiAl alloy, and the W and Ti atoms have some difference on atomic radius and coefficient of thermal expansion, which makes the lattice distort and furtherly prohibits the diffusion of W element. The results of hardness test show that, after diffusion of tungsten in the TiAl alloy, the hardness of TiAl alloy is reinforced, and the value increases with the increase of W contont.

Key words: titanium aluminum alloy, diffusion mechanism, diffusion bonding, tungsten

中图分类号:

TG146

黄庆奕, 易元. 扩散时间对W在TiAl合金中扩散行为的影响[J]. 金属热处理, 2020, 45(11): 94-98.

Huang Qingyi, Yi Yuan. Effect of diffusion time on diffusion behavior of tungsten in TiAl alloy[J]. Heat Treatment of Metals, 2020, 45(11): 94-98.

参考文献

[1]Appel F, Wagner R. Microstructure and deformation of two-phase γ-titanium aluminides[J]. Materials Science and Engineering R, 1998, 22(5): 187-268.
[2]冯旭东, 袁庆龙, 曹晶晶, 等. TiAl基合金研究进展[J]. 航天制造技术, 2009(3): 35-38.
Feng Xundong, Yuan Qinglong, Cao Jingjing, et al. Progress in TiAl-based alloys[J]. Aerospace Manufacturing Technology, 2009(3): 35-38.
[3]蔡建明, 李臻熙, 马济民, 等. 航空发动机用600 ℃高温钛合金的研究与发展[J]. 材料导报, 2005, 19(1): 50-53.
Cai Jianming, Li Zhenxi, Ma Jimin, et al. Research and development of 600 ℃ high temperature titanium alloys for aeroengine[J]. Materials Review, 2005, 19(1): 50-53.
[4]王秀锋, 喻更生, 刘学斌, 等. γ-TiAl基合金超塑扩散连接实验与理论的研究[J]. 钛工业进展, 2006, 23(1): 10-15.
Wang Xiufeng, Yu Gengsheng, Liu Xuebin, et al. Experimental and theoretical study of superplastic forming/diffusion bonding in γ-TiAl based alloys[J]. Titanium Industry Progress, 2006, 23(1): 10-15.
[5]罗致春, 王秀锋, 刘学斌, 等. γ-TiAl基合金与异种合金扩散连接研究[J]. 钛工业进展, 2006, 23(6): 20-23.
Luo Zhichun, Wang Xiufeng, Liu Xuebin, et al. Diffusion bonding of γ-TiAl based alloys to different alloys[J]. Titanium Industry Progress, 2006, 23(6): 20-23.
[6]何鹏, 冯吉才, 钱乙余. TiAl/40Cr钢扩散连接界面组织结构对接头强度的影响[J]. 材料科学与工艺, 2003, 11(2): 144-147.
He Peng, Feng Jicai, Qian Yiyu. Effect of interfacial microstructure of TiAl/40Cr diffusion bonding on strength of joint[J]. Materials Science and Technology, 2003, 11(2): 144-147.
[7]李书江, 王艳丽, 林均品, 等. 微量C, B对高铌TiAl合金显微组织与力学性能的影响[J]. 稀有金属材料与工程, 2004, 33(2): 144-148.
Li Shujiang, Wang Yanli, Lin Junpin, et al. Influence of C and B elements on structures and mechanical properties for high Nb containing TiAl alloy[J]. Rare Metal Materials and Engineering, 2004, 33(2): 144-148.
[8]孙红亮, 孙才, 黄泽文, 等. W对含铌TiAl合金组织与力学性能的影响[J]. 热加工工艺, 2011, 40(22): 15-17.
Sun Hongliang, Sun Cai, Huang Zeiwen, et al. Effect of tungsten addition on microstructure and mechanical properties of TiAl-based alloy[J]. Hot Working Technology, 2011, 40(22): 15-17.
[9]Wu Y, Hwang S K, Morris J W. Development and elemental powder metallurgy of a Y-containing two-phase TiAl alloy[J]. Metallurgical and Materials Transactions A, 2003, 34(10): 2077.
[10]张宁, 林均品, 王艳丽, 等. W, B, Y合金元素对高铌TiAl基合金高温长期抗氧化性能的影响[J]. 稀有金属材料与工程, 2007, 36(5): 884-887.
Zhang Ning, Lin Junpin, Wang Yanli, et al. Influence of W, B, and Yelements on antioxidation of high temperature and long term for TiAl based alloys with high Nb content[J]. Rare Metal Materials and Engineering, 2007, 36(5): 884-887.
[11]Shida Y, Anada H. Role of W, Mo, Nb and Si in oxidation of TiAl in air at high temperature[J]. Journal of the Japan Institute of Metals, 1994, 58(7): 754-762.

[1]	檀校, 郝玉朋, 于晓东, 王玉天, 谭成文, 胡劲. 退火温度对冷轧气相沉积高纯钨再结晶行为的影响[J]. 金属热处理, 2021, 46(3): 33-38.
[2]	钱钰, 崔功军, 卞灿星, 寇子明. WS₂增强CoCrTi复合材料的制备及高温摩擦学性能[J]. 金属热处理, 2021, 46(12): 94-99.
[3]	陶桂东, 李恒奎, 徐忠宣, 陈志元, 孙红亮. 箔-纤维-箔法制备Mo_f/TiAl复合材料的显微组织与性能[J]. 金属热处理, 2020, 45(4): 22-28.
[4]	郭红星. 钨对铸态过共晶高铬铸铁组织、力学性能和磨料磨损性能的影响[J]. 金属热处理, 2017, 42(4): 72-76.
[5]	綦秀玲1,2，孙琳琳1，张勇1. 磁场频率对AZ91合金焊接接头直接时效的组织和性能的影响[J]. 金属热处理, 2016, 41(5): 149-152.
[6]	张艳梅，帅歌国，黄杰煌，刘晶. 激光熔覆原位自生WxC颗粒增强镍基复合涂层[J]. 金属热处理, 2016, 41(2): 79-83.
[7]	綦秀玲1、2，刘政军2，周有兴1，万应麒1，张勇1. 磁场频率对固溶时效处理AZ91合金焊接接头组织和性能的影响[J]. 金属热处理, 2016, 41(2): 155-158.
[8]	张志宏1, 2，宋红梅1，江来珠1，崔振山2. 含钨超级双相不锈钢连续冷却过程中的析出相[J]. 金属热处理, 2016, 41(10): 108-111.
[9]	王鹏，刘凯. 钨对贝氏体钢力学性能及氢脆敏感性的影响[J]. 金属热处理, 2015, 40(5): 10-14.
[10]	赵刚1，周小军1,2，田进鹏1，岳坤1，董凯1，张静2. 航天发动机用铌钨合金表面涂层堆积[J]. 金属热处理, 2015, 40(12): 161-165.
[11]	骆统领，郑兴华，许海锋，秦帅帅，王杰强. 退火对含铁钨青铜型铌酸盐结构和性能的影响[J]. 金属热处理, 2015, 40(11): 145-148.
[12]	綦秀玲1,2，刘政军2，周有兴1，万应麒1，张勇1. 磁场电流对固溶处理AZ91焊接接头组织和性能的影响[J]. 金属热处理, 2015, 40(11): 172-175.
[13]	彭伟, 张德闯, 唐德明, 林建国. 以Cu基非晶为中间层的TiAl合金瞬时液相扩散连接界面组织及力学性能[J]. 金属热处理, 2014, 39(8): 5-10.
[14]	李强, 王伟, 杨晓峰, 孙钊, 李启寿. Al₂O₃/Kovar热等静压扩散层的组织与性能[J]. 金属热处理, 2014, 39(8): 61-63.
[15]	李强, 王伟, 杨晓峰, 范辉. 碳氧杂质对93W-5Ni-2Fe高密度钨合金冲击性能的影响[J]. 金属热处理, 2014, 39(7): 28-31.