<strong>CrTaTi</strong>难熔中熵合金的力学性能和抗氧化性能

doi:10.11901/1005.3093.2022.403

材料研究学报

2023, Vol. 37

Issue (6): 443-452 DOI: 10.11901/1005.3093.2022.403

研究论文

本期目录 | 过刊浏览

CrTaTi难熔中熵合金的力学性能和抗氧化性能

史畅, 杜宇航, 赖利民, 肖思明, 郭宁, 郭胜锋(

)

西南大学材料与能源学院重庆 400715

Mechanical Properties and Oxidation Resistance of a Refractory Medium-entropy Alloy CrTaTi

SHI Chang, DU Yuhang, LAI Liming, XIAO Siming, GUO Ning, GUO Shengfeng(

)

School of Materials and Energy, Southwest University, Chongqing 400715, China

引用本文:

史畅, 杜宇航, 赖利民, 肖思明, 郭宁, 郭胜锋. CrTaTi难熔中熵合金的力学性能和抗氧化性能[J]. 材料研究学报, 2023, 37(6): 443-452.
Chang SHI, Yuhang DU, Liming LAI, Siming XIAO, Ning GUO, Shengfeng GUO. Mechanical Properties and Oxidation Resistance of a Refractory Medium-entropy Alloy CrTaTi[J]. Chinese Journal of Materials Research, 2023, 37(6): 443-452.

全文: PDF(14318 KB) HTML

摘要:

根据成分设计制备出等原子比CrTaTi难熔中熵合金，研究这种合金的室温力学性能和高温抗氧化行为。结果表明，这种合金的铸态由bcc基体相和少量的Cr₂Ta Laves相组成，固溶强化和析出强化的协同作用使其具有良好的室温综合力学性能，压缩屈服强度和断裂应变分别为1500 MPa和22%。在600~1000℃的高温CrTaTi难熔中熵合金的短时抗氧化性能优异，其原因是在其表面生成了含TiO₂和Cr₂O₃的复合氧化层，即使在1000℃氧化10 h其氧化增重也只有8.4 mg/cm²。

关键词 ：金属材料, 难熔中熵合金, 微观结构, 室温力学性能, 高温抗氧化

Abstract：

A new refractory medium-entropy alloy of CrTaTi has been successfully developed through the reasonably composition design, and the room-temperature mechanical properties and high-temperature oxidation resistance of the alloy were systematically investigated in this paper. The results show that the as-cast alloy is composed of bcc phase matrix and a small amount of Cr₂Ta Laves phase. The solid solution strengthening and precipitation strengthening make the alloy with good comprehensive mechanical properties at room-temperature. During the short-term oxidation test at medium- and high-temperatures a composite oxide scale containing TiO₂ and Cr₂O₃ preferentially formed on the alloy surface, showing excellent oxidation resistance. The oxidation weight gain of CrTaTi alloy is only 8.4 mg/cm² after oxidation in air at 1000℃ for 10 h.

Key words： metallic materials refractory medium entropy alloy microstructure room-temperature mechanical properties high-temperature oxidation resistance

收稿日期: 2022-07-20

ZTFLH:

TB31

基金资助:国家自然科学基金(52071276)

通讯作者: 郭胜锋，教授，sfguo@swu.edu.cn，研究方向为非晶合金、高熵合金以及生物可降解材料

Corresponding author: GUO Shengfeng, Tel: 13500330725, E-mail: sfguo@swu.edu.cn

作者简介: 史畅，女，1999年生，硕士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2022.403 或 https://www.cjmr.org/CN/Y2023/V37/I6/443

图1 CrTaTi在不同温度下平衡相的计算摩尔分数和铸态CrTaTi难熔中熵合金的XRD谱

图2 铸态CrTaTi难熔中熵合金的SEM背散射图

表1 CrTaTi难熔中熵合金枝晶与枝晶间区域化学组成

图3 铸态CrTaTi难熔中熵合金的室温压缩工程应力应变曲线和典型铸态难熔多主元合金力学性能的统计图[7,23~33]

图4 在不同温度等温氧化不同时间后样品的形貌和等温氧化不同时间后样品的质量变化

表2 一些典型难熔多主元合金在1000℃氧化3 h后的增重

表3 CrTaTi难熔中熵合金的混合熵(ΔSmix)、混合焓(ΔHmix)、原子尺寸差(δ)、参数Ω、价电子浓度(VEC)以及电负性差(ΔX)

表4 Cr、Ta和Ti的剪切模量和原子半径[45]

图5 在1000℃氧化10 h后样品表面氧化物的XRD谱

图6 CrTaTi合金在1000℃等温氧化3 h和10 h后的截面SEM图像和EDS元素分布

图7 CrTaTi合金氧化5 min、10 min、30 min后的SEM图以及EDS元素的分布特征

图8 CrTaTi合金在1000℃氧化0、5、10和30 min后样品表面Cr2p精细谱分峰的拟合、Ti2p精细谱分峰拟合、Ta4f精细谱分峰拟合结果以及氧化不同时间后Cr、Ta和Ti三种元素的氧化物占比

表5 Cr、Ta和Ti的氧化物在1000℃的标准Gibbs自由能

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