Enhanced strain rate sensitivity of Zr-based bulk metallic glasses subjected to high pressure torsion

被引：41

作者：

Boltynjuk, E. V. ^{[1
]}

Gunderov, D. V. ^{[2
,3
]}

Ubyivovk, E. V. ^{[4
]}

Monclus, M. A. ^{[5
]}

Yang, L. W. ^{[5
]}

Molina-Aldareguia, J. M. ^{[5
]}

Tyurin, A. I. ^{[6
]}

Kilmametov, A. R. ^{[7
]}

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

Churyumov, A. Yu. ^{[8
]}

Valiev, R. Z. ^{[1
,2
]}

机构：

[1] St Petersburg State Univ, 28 Univ Skiy Pr, St Petersburg 198504, Russia

[2] Ufa State Aviat Tech Univ, 12 K Marx Str, Ufa 450008, Russia

[3] Inst Mol & Crystal Phys RAS, Prospekt Oktyabrya 151, Ufa 450075, Russia

[4] ITMO Univ, 49 Kronverksky Pr, St Petersburg 197101, Russia

[5] IMDEA Mat Inst, Calle Eric Kandel 2, Madrid 28906, Spain

[6] Derzhavin State Univ, Res Inst Nanotechnol & Nanomat, Tambov 392000, Russia

[7] KIT, Inst Nanotechnol, Hermann von Helmholtz Pl 1, D-76344 Eggenstein Leopoldshafen, Germany

[8] Natl Univ Sci & Technol MISiS, Moscow 119049, Russia

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2018年 / 747卷

关键词：

Metallic glasses; High pressure torsion; Transmission electron microscopy; Nanoindentation; Strain rate sensitivity; Shear transformation zones; MECHANICAL-PROPERTIES; PLASTIC-DEFORMATION; AMORPHOUS-ALLOYS; FREE-VOLUME; INDENTATION; NANOINDENTATION; DEPENDENCE; DUCTILITY; STRENGTH; BEHAVIOR;

D O I：

10.1016/j.jallcom.2018.03.018

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The Zr62Cu22Al10Fe5Dy1 bulk metallic glass (BMG) was subjected to high pressure torsion (HPT) at room temperature. The state after HPT processing demonstrates presence of large number of heterogeneities in amorphous structure - shear bands. Nanoindentation was used to study the effect of HPT processing on deformation behavior and strain rate sensitivity (m). It was found that HPT significantly affects mechanical behavior of BMG during nanoindentation. Decrease in hardness and Young's modulus was observed after HPT. At the same time HPT processing led to an increase in m from 0.014 for the as-cast material to 0.036. The lack of serration flow and shear bands around imprints was observed in addition to above mentioned changes. A much less localized deformation mode under nanoindentation along with an increase in values of strain rate sensitivity of HPT-processed state in comparison with the initial state imply homogeneous deformation behavior after processing. The observed drastic changes in deformation behavior and structure can be explained as the formation of a highly-heterogeneous amorphous structure resembling nanoglasses in result of HPT processing. (C) 2018 Elsevier B.V. All rights reserved.

引用

页码：595 / 602

页数：8

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