Effect of Mechanical Alloying and Sintering Behavior on the Microstructure and Properties of NbMoTaWRe Refractory High Entropy Alloy

Tao Gu; Li‑Min Wang; Qiang Hu; Xiu‑Bing Liang; Dong‑Xing Fu; Yong‑Xiong Chen; Xin‑Ming Zhao; Yan‑Wei Sheng

doi:10.1007/s12540-021-01165-6

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자료유형: 학술저널

저자정보: Tao Gu (GRIPM Advanced Materials Co. Ltd) Li‑Min Wang (GRIPM Advanced Materials Co. Ltd) Qiang Hu (GRIPM Advanced Materials Co. Ltd) Xiu‑Bing Liang (Joint Laboratory of Advanced Metallic Materials Application Technology) Dong‑Xing Fu (GRIPM Advanced Materials Co. Ltd) Yong‑Xiong Chen (GRIPM Advanced Materials Co. Ltd) Xin‑Ming Zhao (Beijing COMPO Advanced Technology Co. Ltd) Yan‑Wei Sheng (Beijing COMPO Advanced Technology Co. Ltd)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.28 No.11

발행연도: 2022.11

수록면: 2,571 - 2,582 (12page)

DOI: 10.1007/s12540-021-01165-6

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An equiatomic refractory high-entropy alloy (RHEA) NbMoTaWRe is prepared by mechanical alloying (MA) and sparkplasma sintering (SPS). The effects of mechanical alloying and sintering behaviors on the microstructure and propertiesof the RHEA are investigated. After ball-milling for 30 h, the metastable and supersaturated MA powders with the bodycenteredcubic (BCC) structure are obtained. Then, the MA powders are sintered using the SPS method under the sinteringtemperature range of 1700–1900 °C, and the C atoms and WC introduced by the MA process reacts with the metastable andsupersaturated Ta/Nb phase of the MA powers to form the face-centered cubic (FCC) structure (Nb, Ta)C particles alongthe BCC matrix boundaries during the SPS process. The NbMoTaWRe alloy sintered at 1800 °C consisted of BCC matrixand FCC-type (Nb, Ta)C particles has high compactness (porosity fraction is 0.32%), fracture strength (2630 MPa), plasticstrain (6.82%), and hardness (992 ± 20 HV). These excellent properties of this RHEA are mainly attributed to the combinationof multi-effects, including sintering densification, grain refinement strengthening from the refined sizes (3.80 μm) BCCmatrix, precipitation strengthening from the (Nb, Ta)C particles, solid solution strengthening from multi-principal elementsand interstitial solid solution strengthening from C atoms dissolving into BCC matrix.

#Refractory high-entropy alloy · Spark plasma sintering · Microstructure · Mechanical properties

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