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

Luo，Jiasi1,2; Sun，Wanting1; Duan，Ranxi2; Yang，Wenqing1; Chan，K. C.1; Ren，Fuzeng2; Yang，Xu Sheng1,3

2022-05-30

10.1016/j.jmst.2021.09.029

JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY   影响因子和分区

1005-0302

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 high-entropy 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 body-centered-cubic TiZrHfTaNb refractory high-entropy alloy is gradually decomposed into TiNb-rich body-centered-cubic phase, TaNb-rich body-centered-cubic phase, ZrHf-rich hexagonal-close-packed phase and TiZrHf-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.

Gradient nanostructure High-resolution transmission electron microscopy Laser surface treatment Refractory high-entropy alloy Wear resistance

SCI ; EI

英语

ESI高被引

通讯

Research Committee of PolyU[RK2N] ; National Natural Science Foundation of China Projects[51701171,51971187] ; Fundamental Research Program of Shenzhen[JCYJ20170412153039309]

Materials Science ; Metallurgy & Metallurgical Engineering

Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering

WOS:000788117100005

JOURNAL MATER SCI TECHNOL

20214711202953

Entropy ; Grain size and shape ; High-entropy alloys ; Niobium alloys ; Spark plasma sintering ; Tantalum alloys ; Wear of materials ; Wear resistance ; Zircaloy

Metallurgy and Metallography:531 ; Chromium and Alloys:543.1 ; Tantalum and Alloys:543.4 ; Iron Alloys:545.2 ; Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals:549.3 ; Thermodynamics:641.1 ; Optical Devices and Systems:741.3 ; Physical Properties of Gases, Liquids and Solids:931.2 ; Materials Science:951

MATERIALS SCIENCE

2-s2.0-85119368820

Scopus

1.Department of Industrial and Systems Engineering,Advanced Manufacturing Technology Research Centre,The Hong Kong Polytechnic University,Kowloon,Hung Hom,China
2.Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
3.The Hong Kong Polytechnic University Shenzhen Research Institute,Shenzhen,518060,China

Luo，Jiasi,Sun，Wanting,Duan，Ranxi,et al. Laser surface treatment-introduced gradient nanostructured TiZrHfTaNb refractory high-entropy alloy with significantly enhanced wear resistance[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2022,110:43-56.

Luo，Jiasi.,Sun，Wanting.,Duan，Ranxi.,Yang，Wenqing.,Chan，K. C..,...&Yang，Xu Sheng.(2022).Laser surface treatment-introduced gradient nanostructured TiZrHfTaNb refractory high-entropy alloy with significantly enhanced wear resistance.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,110,43-56.

Luo，Jiasi,et al."Laser surface treatment-introduced gradient nanostructured TiZrHfTaNb refractory high-entropy alloy with significantly enhanced wear resistance".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 110(2022):43-56.