微纳米Ti2AlC增强TiAl复合材料高温强韧化机制

doi:10.11900/0412.1961.2023.00067

金属学报

2024, Vol. 60

Issue (12): 1746-1754 DOI: 10.11900/0412.1961.2023.00067

研究论文

本期目录 | 过刊浏览

微纳米Ti₂AlC增强TiAl复合材料高温强韧化机制

陈占兴¹, 王玉鹏², 荣光飞², 张新房¹, 马腾飞²(

), 王晓红², 邢秋玮¹, 朱冬冬²(

)

1 郑州航空工业管理学院材料科学与工程学院郑州 450046
2 衢州学院浙江省空气动力装备技术重点实验室衢州 324000

High-Temperature Strengthening and Toughening Mechanisms of Micro-Nano Ti₂AlC Reinforced TiAl Composites

CHEN Zhanxing¹, WANG Yupeng², RONG Guangfei², ZHANG Xinfang¹, MA Tengfei²(

), WANG Xiaohong², XING Qiuwei¹, ZHU Dongdong²(

)

1 School of Materials Science and Engineering, Zhengzhou University of Aeronautics, Zhengzhou 450046, China
2 Key Laboratory of Air-Driven Equipment Technology of Zhejiang Province, Quzhou University, Quzhou 324000, China

引用本文:

陈占兴, 王玉鹏, 荣光飞, 张新房, 马腾飞, 王晓红, 邢秋玮, 朱冬冬. 微纳米Ti₂AlC增强TiAl复合材料高温强韧化机制[J]. 金属学报, 2024, 60(12): 1746-1754.
Zhanxing CHEN, Yupeng WANG, Guangfei RONG, Xinfang ZHANG, Tengfei MA, Xiaohong WANG, Qiuwei XING, Dongdong ZHU. High-Temperature Strengthening and Toughening Mechanisms of Micro-Nano Ti₂AlC Reinforced TiAl Composites[J]. Acta Metall Sin, 2024, 60(12): 1746-1754.

全文: PDF(3561 KB) HTML

摘要:

微纳米颗粒增强TiAl复合材料拉伸行为的研究较少，且微纳米颗粒在高温下对TiAl复合材料断裂行为的影响仍不清晰，因此有必要研究微纳米Ti₂AlC颗粒增强TiAl复合材料的高温强韧化机制。本工作利用放电等离子烧结(SPS)技术原位合成微纳米Ti₂AlC颗粒增强TiAl复合材料，通过控制烧结温度，分别获得近片层、细小全片层和粗大全片层组织的Ti₂AlC/TiAl复合材料。分别在800和850℃、应变速率0.0001 s^-1条件下研究了Ti₂AlC/TiAl复合材料的高温拉伸性能及相应的强韧化机制。结果表明，微纳米尺度Ti₂AlC颗粒增强的近片层、细小全片层TiAl复合材料具有良好的强塑性，细小全片层Ti₂AlC/TiAl复合材料在850℃、0.0001 s^-1变形条件下的抗拉强度和断裂应变分别达到496 MPa和10.7%，较全片层Ti-48Al-2Nb-2Cr合金(800℃、0.0001 s^-1变形条件下抗拉强度467 MPa，断裂应变4.5%)使用温度提升50℃。Ti₂AlC/TiAl复合材料的强韧化机制主要为微纳米Ti₂AlC颗粒细化烧结组织、阻碍位错运动、促进孪晶形成、阻碍裂纹扩展，从而提高复合材料强度和塑性。

关键词 ：颗粒增强TiAl复合材料, 放电等离子烧结(SPS), 强韧化机制

Abstract：

Metal matrix composites reinforced with micro-nano particles have emerged as a promising avenue for the development of advanced structural materials. Such composites can considerably enhance the strength and toughness of metals. TiAl composites with reinforced micro-nano Ti₂AlC particles exhibit excellent mechanical properties at room temperature and impressive oxidation resistance at high temperatures. However, there is limited study on the tensile behavior of micro-nano particles reinforced TiAl composites. The impact of micro-nano particles on the tensile fracture of TiAl composites at high temperatures remains largely unexplored; hence, it is crucial to investigate the high-temperature strengthening and toughening mechanisms of micro-nano Ti₂AlC particles reinforced TiAl composites. In this study, micro-nano Ti₂AlC particles reinforced TiAl composites were in situ synthesized by spark plasma sintering (SPS) at 1250-1350^oC using Ti-48Al-2Nb-2Cr prealloyed powders with addition of 0.5% graphene oxide. With increase in sintering temperature, various microstructures of Ti₂AlC/TiAl composites were observed, ranging from near fully lamellar to coarse fully lamellar. The high-temperature tensile properties of these composites with varying microstructures at 800 and 850^oC at a strain rate of 0.0001 s^-1 were systematically studied. The corresponding strengthening and toughening mechanisms were discussed based on the observed fracture morphologies. The findings revealed that the composites reinforced with micro-nano Ti₂AlC particles, especially those with near and fine fully lamellar structures, exhibited a synergy between strength and ductility at high temperatures. For instance, the fine fully lamellar Ti₂AlC/TiAl composite displayed ultimate tensile strength of 496 MPa and a fracture strain of 10.7% at 850^oC and 0.0001 s^-1. This represents a 50^oC increase in working temperature compared to that of the fully lamellar Ti-48Al-2Nb-2Cr alloy (The ultimate tensile strength and fracture strain at 800^oC and 0.0001 s^-1 were 467 MPa and 4.5%, respectively). The enhanced high-temperature properties of the Ti₂AlC/TiAl composites were primarily attributed to the micro-nano Ti₂AlC particles, which refined the lamellar colonies and hindered dislocation movement and crack propagation.

Key words： particle reinforced TiAl composites spark plasma sintering (SPS) strengthening and toughening mechanisms

收稿日期: 2023-02-18

ZTFLH:

TG146.2

基金资助:国家自然科学基金项目(52001262);国家自然科学基金项目(52001283);国家自然科学基金项目(52171120);河南省科技攻关项目(212102210447);河南省科技攻关项目(222102230041)

通讯作者: 马腾飞，matengfeihit@163.com，主要从事TiAl合金组织与性能调控研究;
朱冬冬，zhudd8@163.com，主要从事TiAl合金凝固组织与性能研究

Corresponding author: MA Tengfei, associate professor, Tel: (0571)8026716, E-mail: matengfeihit@163.com;
ZHU Dongdong, professor, Tel: (0570)80266634, E-mail: zhudd8@163.com

作者简介: 陈占兴，男，1985年生，博士

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	陈占兴
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	张新房
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	王晓红
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	朱冬冬
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https://www.ams.org.cn/CN/10.11900/0412.1961.2023.00067 或 https://www.ams.org.cn/CN/Y2024/V60/I12/1746

图1 1300℃烧结TiAl合金及不同温度烧结添加0.5%氧化石墨烯(GO)的Ti2AlC颗粒增强TiAl复合材料微观组织的OM像

图2 1300℃烧结TiAl合金及不同温度烧结添加0.5%GO的Ti2AlC颗粒增强TiAl复合材料微观组织的SEM像

图3 1300℃烧结添加不同含量GO的Ti2AlC颗粒增强TiAl复合材料的Raman光谱

图4 1300℃烧结添加0.5%GO的Ti2AlC颗粒增强TiAl复合材料的TEM表征

图5 1300℃烧结TiAl合金及不同温度烧结添加0.5%GO的Ti2AlC颗粒增强TiAl复合材料的片层团尺寸及片层间距的统计结果

图6 1300℃烧结TiAl合金及不同温度烧结添加0.5%GO的Ti2AlC颗粒增强TiAl复合材料的高温拉伸工程应力-应变曲线

表1 1300℃烧结TiAl合金及不同温度烧结添加0.5%GO的Ti2AlC颗粒增强TiAl复合材料高温拉伸性能

图7 1300℃烧结TiAl合金及添加0.5%GO的Ti2AlC颗粒增强TiAl复合材料高温拉伸断口形貌的SEM像

图8 1300℃烧结的TiAl合金高温拉伸断口附近变形组织的SEM像

图9 1300℃烧结添加0.5%GO的Ti2AlC颗粒增强TiAl复合材料高温拉伸断口附近变形组织的SEM像

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