<strong>2000℃</strong>高温高承载的<strong>Ta-W</strong>难熔合金

doi:10.11900/0412.1961.2022.00392

金属学报

2022, Vol. 58

Issue (10): 1253-1260 DOI: 10.11900/0412.1961.2022.00392

研究论文

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2000℃高温高承载的Ta-W难熔合金

张旭, 田谨, 薛敏涛, 江峰, 李苏植(

), 张博召, 丁俊, 李小平, 马恩, 丁向东, 孙军(

)

西安交通大学金属材料强度国家重点实验室西安 710049

Ta-W Refractory Alloys with High Strength at 2000^oC

ZHANG Xu, TIAN Jin, XUE Mintao, JIANG Feng, LI Suzhi(

), ZHANG Bozhao, DING Jun, LI Xiaoping, MA En, DING Xiangdong, SUN Jun(

)

State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, China

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摘要:

如何在保持高温优异力学性能的同时,还能兼顾优异的室温塑性和加工成型能力,一直是超高温难熔合金设计的难点。本工作设计并利用真空电弧熔炼制备了W含量(原子分数)分别为10%、20%、30%、40%和50%的Ta-W合金。这些合金形成了Ta和W均匀互溶的具有bcc结构的单相固溶体,其晶粒尺寸随着W含量的增加而减小。测试了Ta-W合金在室温(25℃)和高温(2000℃)下的压缩应力-应变曲线,结果表明,室温和高温下Ta-W合金的压缩强度均随着W含量的增加而提高,提高的幅度在W含量超过20%后趋于平缓。值得注意的是,Ta-W合金在2000℃下具有优异的高温强度,例如,Ta-20%W合金的屈服强度可达236 MPa,并同时具有超过40%的室温压缩应变和较好的(机)加工成型能力。现有理论模型较好地预测了合金室温和高温的压缩强度,其主要强化机制均为固溶强化。该合金体系有望作为新型超高温材料应用于航空航天的关键承载结构部件。

关键词 ： Ta-W合金, 压缩力学性能, 高温强度

Abstract：

Advanced structural alloys that can withstand exceedingly high operating temperatures are in high demand. The high-temperature strength of these alloys needs to be above a certain level, above and beyond what can be offered by currently available alloys, while still having adequate room-temperature ductility to allow sufficient forming ability. In this study, Ta-W refractory alloys with W content ranging from 10% to 50% (atomic fraction) are prepared using arc-melting. All the Ta-W alloys are single-phase solid solutions with a bcc structure, and their average grain size decreases with increasing W content. Uniaxial compression tests are performed at both 25°C and 2000°C for the Ta-W alloys. The results suggest that the compressive yield strength of the Ta-W alloys increases with the W concentration at both temperatures, and they exhibit excellent compressive strength at high temperatures. In particular, the strength of the Ta-20%W alloy could reach as high as 236 MPa at 2000°C, a benchmark never reported for known alloys, while offering room-temperature shaping capability with a compressive strain over 40% at 25°C. A recent model based on screw dislocation activities in bcc concentrated solutions yields a reasonable prediction for the yield strength measured at both temperatures. Such Ta-W refractory alloys have the potential for load-bearing applications at extremely high temperatures.

Key words： Ta-W alloy compressive mechanical property high-temperature strength

收稿日期: 2022-08-12

ZTFLH:

TG146.4

基金资助:国家自然科学基金联合基金重点项目(U2067219)

通讯作者: 李苏植,孙军 E-mail: lisuzhi@xjtu.edu.cn,junsun@xjtu.edu.cn

Corresponding author: LI Suzhi,SUN Jun E-mail: lisuzhi@xjtu.edu.cn,junsun@xjtu.edu.cn

作者简介: 张旭,男,1998年生,硕士生

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	马恩
	丁向东
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引用本文:

张旭, 田谨, 薛敏涛, 江峰, 李苏植, 张博召, 丁俊, 李小平, 马恩, 丁向东, 孙军. 2000℃高温高承载的Ta-W难熔合金[J]. 金属学报, 2022, 58(10): 1253-1260.
Xu ZHANG, Jin TIAN, Mintao XUE, Feng JIANG, Suzhi LI, Bozhao ZHANG, Jun DING, Xiaoping LI, En MA, Xiangdong DING, Jun SUN. Ta-W Refractory Alloys with High Strength at 2000^oC[J]. Acta Metall Sin, 2022, 58(10): 1253-1260.

链接本文:

https://www.ams.org.cn/CN/10.11900/0412.1961.2022.00392 或 https://www.ams.org.cn/CN/Y2022/V58/I10/1253

图1 Ta-W合金压缩试样尺寸

图2 电弧熔炼制备的不同W含量的Ta-W合金锭

图3 不同W含量Ta-W合金的XRD谱和晶格常数

图4 Ta-W合金的微观组织的SEM像及其EDS面扫描分析

图5 Ta-W合金25和2000℃高温压缩性能,以及该合金与文献中Ta-W合金[23]和难熔高熵合金[9,24~29]压缩性能的对比(列出了商业镍基高温合金[30]的拉伸强度作为参考态)

表1 Ta-W合金在25和2000℃下压缩屈服强度实验测量值与理论预测值 (MPa)

图6 25和2000℃下Ta-W合金理论模型预测和实验测量的压缩屈服强度的对比

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