The fabrication of high strength Zr/Nb nanocomposites using high-pressure torsion

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:790

Article

Luo, Dan¹  Huminiuc, Teodor²  Huang, Yi^2,3  Polcar, Tomas²  Langdon, Terence G.² 

[1] Univ Sheffield, Dept Mat Sci & Engn, Sheffield S1 3JD, S Yorkshire, England

[2] Univ Southampton, Engn Mat, Dept Mech Engn, Southampton SO17 1BJ, Hants, England

[3] Bournemouth Univ, Dept Design & Engn, Fac Sci & Technol, Poole BH12 5BB, Dorset, England

关键词: Hardness;    High-pressure torsion;    Nanostructures;    Ultrafine grains;    Zr/Nb nanocomposites;   

DOI  :  10.1016/j.msea.2020.139693

来源: Elsevier

【 摘 要 】

Nanocomposites of Zr/Nb with exceptionally high hardness were fabricated successfully through the high-pressure torsion (HPT) processing of prepacked Nb/Zr/Nb sandwich samples at ambient temperature. The initial layers of Nb and Zr became fragmented during HPT processing with the formation of many fine-scale intermixed Zr/Nb layers. The intermixing of these Zr/Nb layers increased both with increasing HPT revolutions from 10 to 100 and with increasing radial positions on the disks. The Vickers microhardness, Hv, increased with increasing revolutions and with radial position reaching a maximum of similar to 700 Hv at the edge of the 100 turns sample. Exceptional grain refinement to the range of similar to 20-40 nm and the occurrence of twinning were associated with the HPT-processed Zr/Nb composites after 100 turns. These results suggest a potential route for fabricating high strength bulk Zr/Nb nanocomposites.

【 授权许可】

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