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Laser surface treatment-introduced gradient nanostructured TiZrHfTaNb refractory high-entropy alloy with significantly enhanced wear resistance

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Journal of Materials Science & Technology 2022年第15期110卷 43-56页

作者： Jiasi Luo Wanting Sun Ranxi Duan Wenqing Yang K.C.Chan Fuzeng Ren Xu-Sheng Yang Department of Industrial and Systems Engineering Advanced Manufacturing Technology Research CentreThe Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055China The Hong Kong Polytechnic University Shenzhen Research Institute Shenzhen 518060China

Heterogeneous gradient nanostructured metals have been shown to achieve the strength-ductility synergy, thus potentially possessing the enhanced tribological performance in comparison with their homogeneous nanograined counterparts. In this work, a facile laser surface remelting-based surface treatment technique is developed to fabricate a gradient nanostructured layer on a TiZrHfTaNb refractory highentropy alloy. The characterization of the microstructural evolution along the depth direction from the matrix to the topmost surface layer shows that the average grain size in the ~100 μm-thick gradient nanostructured layer is dramatically refined from the original ~200 μm to only ~8 nm in the top surface layer. The microhardness is therefore gradually increased from ~240 HV in matrix to ~650 HV in the topmost surface layer, approximately 2.7 times. Noticeably, the original coarse-grained single-phase bodycentered-cubic TiZrHfTaNb refractory high-entropy alloy is gradually decomposed into TiNb-rich bodycentered-cubic phase, TaNb-rich body-centered-cubic phase, ZrHf-rich hexagonal-close-packed phase and TiZr Hf-rich face-centered-cubic phase with gradient distribution in grain size along the depth direction during the gradient refinement process. As a result, the novel laser surface treatment-introduced gradient nanostructured TiZrHfTaNb refractory high-entropy alloy demonstrates the significantly improved wear resistance, with the wear rate reducing markedly by an order of magnitude, as compared with the as-cast one. The decomposed multi-phases and gradient nanostructures should account for the enhanced wear resistance. Our findings provide new insights into the refinement mechanisms of the laser-treated refractory high-entropy alloys and broaden their potential applications via heterogeneous gradient nanostructure engineering.

关键词： Laser surface treatment refractory high-entropy alloy Gradient nanostructure Wear resistance high-resolution transmission electron microscopy

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Microstructure and mechanical properties of ultra-fine grained MoNbTaTiV refractory high-entropy alloy fabricated by spark plasma sintering

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Journal of Materials Science & Technology 2019年第11期35卷 2600-2607页

作者： Qing Liu Guofeng Wang Xiaochong Sui Yongkang Liu Xiao Li Jianlei Yang National Key Laboratory for Precision Hot Processing of Metals Harbin Institute of Technology

The MoNbTaTiV refractory high-entropy alloy(RHEA)with ultra-fine grains and homogeneous microstructure was successfully fabricated by mechanical alloying(MA)and spark plasma sintering(SPS).The microstructural evolutions,mechanical properties and strengthening mechanisms of the alloys were systematically *** nanocrystalline mechanically alloyed powders with simple bodycentered cubic(BCC)phase were obtained after 40 h MA ***,the powders were sintered using SPS in the temperature range from 1500℃to 1700℃.The bulk alloys were consisted of submicron scale BCC matrix and face-centered cubic(FCC)precipitation *** bulk alloy sintered at 1600℃had an average grain size of 0.58μm and an FCC precipitation phase of 0.18μm,exhibiting outstanding micro-hardness of 542 HV,compressive yield strength of 2208 MPa,fracture strength of 3238 MPa and acceptable plastic strain of 24.9%at room *** enhanced mechanical properties of the MoNbTaTiV RHEA fabricated by MA and SPS were mainly attributed to the grain boundary strengthening and the interstitial solid solution *** is expectable that the MA and SPS processes are the promising methods to synthesize ultra-fine grains and homogenous microstructural RHEA with excellent mechanical properties.

关键词： refractory high-entropy alloy Ultra-fine grain Mechanical alloying Spark plasma sintering Mechanical properties

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Microstructure and mechanical property of NbTaTiV refractory high-entropy alloy with different Y_(2)O_(3) contents

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Rare Metals 2022年第10期41卷 3504-3514页

作者： Tao Liao Yuan-Kui Cao Wen-Min Guo Qi-Hong Fang Jia Li Bin Liu State Key Laboratory of Powder Metallurgy Central South UniversityChangsha410083China State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan UniversityChangsha410082China

In this study,NbTaTiV refractory high-entropy alloys(RHEAs) reinforced with dispersed oxides were successfully designed and fabricated by mechanical alloying and subsequent spark plasma sintering(SPS).The effects of Y_(2)O_(3) content on the microstructure and mechanical properties have been systematically *** results show that the oxide dispersion strengthening(ODS) RHEAs are mainly composed of body centered cubic(BCC) matrix and multiscale oxides,including submicron Ti-(N,O) particles,nano-sized Y-Ti-O particles and nano-sized Y_(2)O_(3) *** ODS-RHEAs have excellent mechanical properties due to the multisc ale *** the content of Y_(2)O_(3) increasing from 1 wt% to 3 wt% Y_(2)O_(3),the compressive yield strength of the ODSRHEAs significantly increases from 1528 to 1866 MPa,while the fracture strain slightly reduces from 22% to 16%.The enhancement of the mechanical property is mainly attributed to the increased amount of multisc ale oxide particles and the refined grain structure.

关键词： refractory high-entropy alloy Oxide dispersion strengthening Spark plasma sintering(SPS) Mechanical property Strengthening mechanism

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A Nitride-Reinforced NbMoTaWHfN refractory high-entropy alloy with Potential Ultra-high-Temperature Engineering Applications

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Engineering 2023年第11期30卷 110-120页

作者： Yixing Wan Yanhai Cheng Yongxiong Chen Zhibin Zhang Yanan Liu Haijun Gong Baolong Shen Xiubing Liang School of Mechanical and Electrical Engineering China University of Mining and TechnologyXuzhou 221116China Defense Innovation Institute Academy of Military ScienceBeijing 100071China School of Materials Science and Engineering Southeast UniversityNanjing 211189China

refractory high-entropy alloys(RHEAs)have promising applications as the new generation of hightemperature alloys in hypersonic vehicles,aero-engines,gas turbines,and nuclear power *** study focuses on the microstructures and mechanical properties of the NbMoTaW(HfN)_(x)(x=0,0.3,0.7,and 1.0)*** alloys consist of multiple phases of body-centered cubic(BCC),hafnium nitride(HfN),or multicomponent nitride(MN)*** the x contents increase,the grain size becomes smaller,and the strength gradually *** compressive yield strengths of the NbMoTaWHfN RHEA at ambient temperature,1000,1400,and 1800℃ were found to be 1682,1192,792,and 288 MPa,*** high-temperature strength of this alloy is an inspiring result that exceeds the high temperature and strength of most known alloys,including high-entropy alloys,refractory metals,and *** HfN phase has a significant effect on strengthening due to its high structural stability and sluggish grain coarsening,even at ultra-high *** superior properties endow the NbMoTaWHfN RHEA with potential for a wide range of engineering applications at ultra-high *** work offers a strategy for the design of high-temperature alloys and proposes an ultra-high-temperature alloy with potential for future engineering applications.

关键词： refractory high-entropy alloy high temperature Mechanical property Microstructure Strengthening mechanism

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

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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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Microstructure and mechanical properties of a low activation cast WTaHfTiZr refractory high-entropy alloy

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China Foundry 2022年第6期19卷 489-494页

作者： Xian-neng Ma Yi-fei Hu Kai Wang Hai-long Zhang Zi-tian Fan Jin-ping Suo Xin-wang Liu State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China Dekai Intelligent Casting Co. Ltd.Zhuozhou 072750HebeiChina China Iron and Steel Research Institute Group Beijing 100081China AECC South Industry Company Limited Zhuzhou 412002HunanChina

In the face of the requirement that nuclear fusion reactor materials exhibit more excellent thermal,mechanical and physical properties,a novel refractory highentropy alloy,WTaHfTiZr was *** constituent elements were selected in consideration of low activation,high melting point and high *** alloys were prepared by arc *** as-cast alloy shows a dendrite microstructure with two disordered BCC phases,which caused by the preferential nucleation of W and Ta with much higher melting points during *** exhibits a high compressive yield strength of 1,900 MPa and fracture strain of 8.1% at room temperature,and its yield strengths are up to 612 MPa at 700 ℃ and 203 MPa at 1,000 ℃,*** high strengths are attributed mainly to solid solution strengthening and second phase *** alloy shows great promise as one of the next-generation nuclear fusion reactor materials.

关键词： refractory high-entropy alloy phase structure microstructure mechanical properties

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Microstructural Evolutions and Mechanical Properties of Energetic Al_(1) (TiZrNbTaMoCr)_(15) high-entropy alloys

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Acta Metallurgica Sinica(English Letters) 2024年第4期37卷 620-632页

作者： Xuan-Hong Cai Zhen-Hua Wang Ben Niu Jin-Feng Li Qing Wang Show authors Key Laboratory of Materials Modification By Laser Ion and Electron Beams(Ministry of Education)Engineering Research Center of High Entropy Alloy Materials(Liaoning Province)School of Materials Science and EngineeringDalian University of TechnologyDalian116024China Institute of Materials China Academy of Engineering PhysicsMianyang621908China

The present study focuses on investigating the microstructural evolutions and mechanical properties of energetic Al_(1)(TiZrNbTaMoCr)_(15) refractory high-entropy alloys with the different heat treatments at low Al content state. It is found that even with a reduction in the Al content, the strength of these alloys remains unaffected at room temperature and high temperature, while the plasticity improves significantly. In particular, the coherent BCC/B_(2) microstructure with needle-like B_(2) nanoprecipitates dispersed into the BCC matrix is formed in 873 K-aged Al_(1)Ti_(6)Zr_(2)Nb_(3)Ta_(3)Mo_(0.5)Cr_(0.5) alloy. Therefore, this alloy exhibits the highest compression yield strength (σ_(YS) = 1333 and 717 MPa) at room temperature and 1073 K, respectively. After 973 K-aged, the coherent BCC/B_(2) microstructure underwent destabilization, and the B_(2) phase transforms into the brittle Zr5Al3 phase which then coarsens and dominates the microstructure of S3-AlTa_(3) alloy after 1073 K-aged. Moreover, these current alloys exhibit exceptionally high theoretical exothermic enthalpy (ΔH), surpassing 11606 J·g^(−1), which highlights their significant potential as innovative high-performance energetic structural materials.

关键词： refractory high-entropy alloy Coherent microstructure Mechanical property Exothermic enthalpy

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refractory high-entropy alloys:A focused review of preparation methods and properties

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Journal of Materials Science & Technology 2023年第11期142卷 196-215页

作者： Wei Xiong Amy X.Y.Guo Shuai Zhan Chain-Tsuan Liu Shan Cecilia Cao Materials Genome Institute Shanghai UniversityShanghai 200444China Hong Kong Institute of Advanced Study City University of Hong KongKowloonHong KongChina

In recent years,high-entropy alloys(HEAs)have become prominent metallic materials due to their unique design strategies and excellent mechanical *** HEAs-inherent high-entropy,lattice-distortion,sluggish-diffusion,and cocktail effects make HEAs maintain high strength,oxidation resistance,corrosion resistance,wear resistance,and other excellent comprehensive properties,showing stronger competitiveness relative to traditional *** high-entropy alloys(RHEAs)are considered as a new kind of high-temperature materials with great application prospects due to their excellent mechanical properties and have the potential to replace nickel-based superalloy as the next generation of high-temperature *** reviewed the research status and preparation methods of RHEAs in recent years,including the metallurgical smelting,powder metallurgy,magnetron sputtering,and additive manufacturing *** microstructure and phase-transformation process of RHEAs were *** mechan-ical properties and main strengthening and toughening mechanisms of RHEAs,such as solid-solution strengthening,precipitation strengthening,and the transformation-induced plasticity(TRIP),were discussed,and the deformation mechanism of RHEAs was *** properties of RHEAs,including high strength,oxidation resistance,corrosion and wear resistance were *** will meet the huge market demand in the engineering materials field,but there are still many challenges,such as the tradeoff between high strength and high ductility,structural design,and performance optimization of RHEAs with brittle BCC *** believe that this combination of knowledge may shape the future of RHEAs and break through the mutually exclusive conundrum of high strength and high toughness for RHEAs.

关键词： refractory high-entropy alloy Preparation technology Phase transformation Mechanical properties Strengthening and toughening mechanisms Deformation mechanisms

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