Accumulative HPT of Zr-based bulk metallic glasses

被引：19

作者：

Gunderov, D., V ^{[1
,2
]}

Churakova, A. A. ^{[2
,3
]}

Astanin, V. V. ^{[3
]}

Asfandiyarov, R. N. ^{[2
,3
]}

Hahn, H. ^{[4
]}

Valiev, R. Z. ^{[1
,3
]}

机构：

[1] St Petersburg State Univ, St Petersburg, Russia

[2] RAS, Ufa Fed Res Ctr, Inst Mol & Crystal Phys, Ufa, Russia

[3] Ufa State Aviat Tech Univ, Ufa, Russia

[4] Karlsruhe Inst Technol, Inst Nanotechnol, Karlsruhe, Germany

来源：

MATERIALS LETTERS | 2020年 / 261卷

关键词：

Nanocrystalline metals; Thermodynamics; Kinetics; Interfaces and surfaces; PLASTIC-DEFORMATION; SHEAR BANDS;

D O I：

10.1016/j.matlet.2019.127000

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Studies show that with the HPT of bulk metallic glass, the actual achievable strain is significantly lower than the one predicted by the equation gamma = 2 pi nR/h. Such a discrepancy can be explained by the effect of "slippage" during the HPT. The authors proposed a new method - "accumulative HPT" - to achieve a high strain in hard materials, including BMGs. In the accumulative HPT procedure, a sample undergoes several cycles: "HPT n = 1 revolution -> cutting a sample into pieces -> pressing of stacked parts on the anvils and subsequent HPT n = 1". At the last stage, the stacked segments are subjected to HPT with many revolutions (n >= 3) whereby the sample is consolidated into a monolithic disk. As a result, the material receives a significant total strain by pressing and torsion. The article presents the first results of the "accumulative HPT" processing of a Zr-based BMG and a crystallized Zr-based intermetallic. (C) 2019 Elsevier B.V. All rights reserved.

引用

页数：3

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