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首页> 外文期刊>Materials Science and Engineering >Microstructure evolution and mechanical properties of diffusion bonding Al_5(TiZrHfNb)_(95) refractory high entropy alloy to Ti_2AlNb alloy
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Microstructure evolution and mechanical properties of diffusion bonding Al_5(TiZrHfNb)_(95) refractory high entropy alloy to Ti_2AlNb alloy

机译:扩散键合Al_5(TizrHFNB)_(95)耐火高熵合金对Ti_2AlNB合金的微观结构演化与力学性能

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摘要

In this study, the refractory high entropy alloy Al_5(TiZrHfNb)_(95) was diffusion bonded (DB) with the intermetallic compound (IMC) Ti_2AlNb under 5 MPa at 970-1100 °C in vacuum. The microstructure and element distribution were analyzed using a scanning electron microscope (SEM) and mechanical properties were evaluated by nanoindentation and shear tests. The typical microstructure of DB joint was Ti_2AlNb substrate/solid solution/ scattered A13Zr5/solid solution/Al_5(TiZrHfNb)_(95) substrate, which the discrete brittle Al_3Zr_5 phase was arranged along a straight line in the bonding surface, and gradually elongated and dissolved as the bonding temperature increased from 970 °C to 1100 °C. The formation of Al_3Zr_5 was attributed to the lowest Gibbs energy of all the possible IMCs in the range of the welding temperature. In the joining region, the IMC Al_3Zr_5 had the highest hardness (9.01 GPa) and modulus (143.37 GPa) but the lowest elastic recovery (20.37%), thus, it tended to cause stress concentration at the phase interface and induced crack initiation, which had a detrimental effect on the shear strength of joints. The shear strength of DB joints improved with the increase of bonding temperature and reached the highest (427 MPa) at 1100 °C owing to is lowest Al_3Zr_5 content. As the bonding temperature increased, the fracture of the joint transformed from intergranular brittle to ductile.
机译:在该研究中,耐火高熵合金Al_5(TizrHFNB)_(95)在970-1100℃下在5MPa下的金属间化合物(IMC)Ti_2AlNB的延伸键合(DB)在真空中。使用扫描电子显微镜(SEM)分析微结构和元件分布,通过纳米狭窄和剪切试验评估机械性能。 DB接头的典型微观结构是Ti_2AlNB基材/固溶体/散射的A13 Zr5 /固溶溶液/ AL_5(TizrHFNB)_(95)衬底,其沿粘合表面中的直线排列,逐渐伸长并伸长溶解随着粘合温度从970℃增加至1100℃。 Al_3ZR_5的形成归因于焊接温度范围内所有可能IMC的最低GIBBS能量。在连接区域中,IMC AL_3ZR_5具有最高的硬度(9.01GPa)和模量(143.37GPa),但弹性回收率最低(20.37%),因此,它倾向于在相界面处引起应力浓度并引起抗裂引起的裂纹启动对关节剪切强度有不利影响。 DB关节的剪切强度随着粘接温度的增加而改善,并在1100℃下达到最高(427MPa),而不是最低的Al_3Zr_5含量。随着键合温度的增加,从晶间脆性转化为延性的关节的断裂。

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  • 来源
    《Materials Science and Engineering》 |2021年第20期|140610.1-140610.9|共9页
  • 作者单位

    State Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi'an 710072 People s Republic of China;

    State Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi'an 710072 People s Republic of China Shaanxi Key Laboratory of Friction Welding Technologies Northwestern Polytechnical University Xi'an 710072 People s Republic of China;

    State Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi'an 710072 People s Republic of China;

    State Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi'an 710072 People s Republic of China;

    Shaanxi Key Laboratory of Friction Welding Technologies Northwestern Polytechnical University Xi'an 710072 People s Republic of China;

    Analytical & Testing Center Northwestern Polytechnical University Xi'an 710072 People's Republic of China;

    Shaanxi Key Laboratory of Friction Welding Technologies Northwestern Polytechnical University Xi'an 710072 People s Republic of China;

    Shaanxi Key Laboratory of Friction Welding Technologies Northwestern Polytechnical University Xi'an 710072 People s Republic of China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Diffusion bonding; Refractory high entropy; Microstructure; Mechanical properties; Titanium alloy;

    机译:扩散键合;难治性高熵;微观结构;机械性能;钛合金;

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