Influence of the high pressure torsion die geometry on the allotropic phase transformations in pure Zr

被引：37
|
作者：
Zhilyaev, A. P. [2 ,3 ]
Galvez, F. [4 ]
Sharafutdinov, A. [5 ]
Perez-Prado, M. T. [1 ]
机构：
[1] Madrid Inst Adv Studies Mat IMDEA Mat, Madrid 28040, Spain
[2] CSIC, CENIM, E-28040 Madrid, Spain
[3] Russian Acad Sci, Inst Met Superplast Problems, Ufa 450001, Russia
[4] Univ Politecn Madrid, ETS Ingn Caminos, E-28040 Madrid, Spain
[5] Innovat Sci Technol Ctr Iskra, Ufa 450000, Russia
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2010年 / 527卷 / 16-17期
关键词：
Omega-Zr; Beta-Zr; High pressure torsion; Constrained; Unconstrained; Room temperature grain growth; Allotropic phase transformation; COMMERCIAL PURITY ALUMINUM; TEMPERATURE GRAIN-GROWTH; MECHANICAL-PROPERTIES; MICROSTRUCTURE EVOLUTION; DEFORMATION-BEHAVIOR; ROOM-TEMPERATURE; PLASTIC-DEFORMATION; MAGNESIUM ALLOY; PEARLITIC STEEL; THIN-FILMS;
D O I：
10.1016/j.msea.2010.02.066
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The effect of the press geometry in the alpha to omega + beta transformation in pure Zr by high pressure torsion (HPT) was investigated. Specimens were processed in constrained and unconstrained setups using a wide range of applied pressures and 5 anvil turns. The resulting microstructures were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM and HRTEM) and electron backscatter diffraction (EBSD). Microhardness distributions were measured for each condition. The transformation kinetics and the stability of the fabricated nanostructures are enhanced when using an unconstrained setup. In the samples processed by constrained HPT the full transformation does not take place even at the highest pressures applied. Additionally, post-processing room temperature grain growth of some of the remaining nanocrystalline alpha-Zr grains with (0 0 0 1) orientations occurs, leading to a significant decrease in hardness. HRTEM allowed confirming the presence of pure beta-Zr. (C) 2010 Elsevier B.V. All rights reserved.
引用
收藏
页码：3918 / 3928
页数：11
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