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Enhanced high-temperature strength of HfNbTaTiZrV refractory high-entropy alloy via Al_(2)O_(3)reinforcement

Journal of Materials Science & Technology 2022年第28期123卷 191-200页

作者： Bingjie Wang Qianqian Wang Nan Lu Xiubing Liang Baolong Shen School of Materials Science and Engineering Jiangsu Key Laboratory for Advanced Metallic MaterialsSoutheast UniversityNanjing 211189China School of Materials Science and Engineering Jiangsu Key Laboratory of Advanced Structural Materials and Application TechnologyNanjing Institute of TechnologyNanjing 211167China Defense Innovation Institute Academy of Military ScienceBeijing 100071China

Novel composites of HfNbTaTiZrV refractory high-entropy alloy(RHEA)reinforced with 0–4 vol.%Al_(2)O_(3)particles have been synthesized by vacuum arc *** microstructure evolution,compressive mechanical properties at room and elevated temperatures,as well as strengthening mechanism of the composites were *** HfNbTaTiZrV RHEA reinforced with 4 vol.%Al_(2)O_(3)displayed excellent phase stability at elevated temperatures.A superior compressive yield strength of 2700 MPa at room temperature,1392 MPa at 800°C,and 693 MPa at 1000°C was obtained for this *** improved yield strength resulted from multiple strengthening mechanisms caused by Al_(2)O_(3)addition,including solution strengthening,interstitial strengthening,grain boundary strengthening,and dispersion ***,the effects of interstitial strengthening increased with temperature and was the main strengthening mechanism at elevated *** findings not only promote the development of oxidereinforced RHEAs for challenging engineering applications but also provide guidelines for the design of light refractory materials with multiple strengthening mechanisms.

关键词： Al_(2)O_(3)-reinforcement HfNbTaTiZrV Refractory high-entropy alloy interstitial strengthening

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Effect of nitrogen on microstructure and mechanical properties of Cr Mn Fe VTi6 high entropy alloy

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Transactions of Nonferrous Metals Society of China 2021年第8期31卷 2415-2427页

作者： Lin ZHANG Ruo-kang SONG Guo-xin QU Tong LU Bgrimm MTC Technology Co. Ltd.Beijing 102628China Beijing System Design Institute of Electro Mechanic Engineering Beijing 100854China The Fourth Academy of CASIC Beijing 100028China

In order to evaluate interstitial strengthening effect on the properties of high entropy alloy(HEA),a nitrogen-doped Cr Mn Fe VTi6 HEA was fabricated by mechanical alloying(MA)and spark plasma sintering(SPS).XRD,SEM,TEM and FIB were used to characterize the phase composition and microstructure of this *** sintered bulk HEA exhibits a microstructure comprising TiNx,BCC,Laves and B2 *** HEA exhibits high yield strength(>2729 MPa)and hardness in lower temperature range ofstrengthening mechanism in the BCC phase indicate that the interstitial strengthening by nitrogen is the dominant *** additions in the BCC phase can produce a yield strength increase of-634 MPa/at.%,which is much higher than the strengthening effects of carbon or boron additions in other *** demonstrates that adding nitrogen is a viable approach for enhancing the strength of HEAs.

关键词： high entropy alloy nitrogen element mechanical properties interstitial strengthening

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