Effect of annealing on structural and phase transformations and mechanical properties of ultrafine-grained E125 zirconium alloy obtained by high-pressure torsion

被引：11
|
作者：
Rogachev, S. O. [1 ]
Nikulin, S. A. [1 ]
Khatkevich, V. M. [1 ]
Gorshenkov, M. V. [1 ]
Sundeev, R. V. [2 ]
Veligzhanin, A. A. [3 ]
机构：
[1] Natl Univ Sci & Technol MISIS, Leninsky Pr 4, Moscow 119049, Russia
[2] Moscow Technol Univ MIREA, Vernadskogo Ave 78, Moscow 119454, Russia
[3] Kurchatov Inst, Natl Res Ctr, Akad Kurchatova Pl 1, Moscow 123182, Russia
来源：
MATERIALS LETTERS | 2017年 / 206卷
关键词：
Zirconium alloy; High-pressure torsion; Nanocrystalline materials; Phase transformation; Microstructure; Mechanical properties; STRENGTH;
D O I：
10.1016/j.matlet.2017.06.107
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The structure, phase composition, and mechanical properties of commercial zirconium E125 (Zr-2.5% Nb) alloy, which was subjected to high-pressure torsion (HPT) and subsequent annealings, were studied. The HPT of alloy samples 20 mm in diameter at 200 degrees C at a pressure of 4 GPa using 5 revolutions (N) leads to the formation of grain-subgrain nano-and submicrocrystalline structure characterized by a high fraction of equiaxed grains 80-100 nm in size. The phase alpha-Zr -> (omega-Zr + beta-Zr) transformation during HPT makes the main contribution to the strength of the alloy. Changes in the mechanical properties of the HPT-alloy during heating are related to both the decomposition of beta-Zr phase and grain growth. (C) 2017 Elsevier B.V. All rights reserved.
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页码：26 / 29
页数：4
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