In situ observation of the "crystalline⇒amorphous state" phase transformation in Ti2NiCu upon high-pressure torsion

被引：21

作者：

Sundeev, R. V. ^{[1
]}

Shalimova, A. V. ^{[2
]}

Glezer, A. M. ^{[2
,3
]}

Pechina, E. A. ^{[4
]}

Gorshenkov, M. V. ^{[3
]}

Nosova, G. I. ^{[2
]}

机构：

[1] Moscow Technol Univ, MIREA, Vernadskogo Pr 78, Moscow 119454, Russia

[2] IP Bardin Sci Inst Ferrous Met, Radio St 23-9, Moscow 105005, Russia

[3] Natl Univ Sci & Technol MISIS, Leninskii Pr 4, Moscow 119049, Russia

[4] Phys Tech Inst, Ural Branch RAN, Kirov St 132, Izhevsk 426000, Russia

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2017年 / 679卷

基金：

俄罗斯基础研究基金会;

关键词：

Severe plastic deformation; High pressure torsion; Amorphous materials; Phase transformation; Amorphization; SHAPE-MEMORY ALLOYS; SEVERE PLASTIC-DEFORMATION; METALLIC MATERIALS; TINI ALLOY; AMORPHIZATION; NANOCRYSTALS; BEHAVIOR; NICKEL; SIZE;

D O I：

10.1016/j.msea.2016.10.028

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The evolution of the structure and mechanical behavior upon deformation has been studied experimentally in situ by room-temperature high-pressure torsion (HPT) of the initially crystalline Ti2NiCu alloy. An abrupt increase in the shear stress upon HPT has been revealed. It was found that the observed effect is due to the deformation-induced "crystalline amorphous state" phase transformation and the corresponding change in the mechanism of severe plastic deformation. It is shown that the amorphization of the material begins at the boundaries of grains and fragments of the crystalline phase as a result of grain boundary sliding processes. It was established that the amorphous boundaries form a "grain-boundary framework", which upon deformation is expanded and transformed into bulk amorphous phase.

引用

页码：1 / 6

页数：6

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