Neutron diffraction study of the deformation mechanisms of the uranium-7 wt.% niobium shape memory alloy

被引：36

作者：

Brown, DW ^{[1
]}

Bourke, MAM ^{[1
]}

Field, RD ^{[1
]}

Hults, WL ^{[1
]}

Teter, DF ^{[1
]}

Thoma, DJ ^{[1
]}

Vogel, SC ^{[1
]}

机构：

[1] Los Alamos Natl Lab, MSH805, Los Alamos, NM 87545 USA

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2006年 / 421卷 / 1-2期

关键词：

uranium-niobium; shape memory effect; neutron diffraction; phase transformation;

D O I：

10.1016/j.msea.2005.10.001

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The shape memory effect (SME) has been reported in the uranium-niobium alloy system in the region of the phase diagram surrounding U-6.5 wt.% Nb. In this regime, the material may have either an alpha" monoclinic (U-6 wt.% Nb), or gamma" tetragonal structure (U-7 wt.% Nb) and is two phase near 6.5 wt.% niobium. In situ neutron diffraction studies during uniaxial compressive loading of U-7 wt.% Nb indicate that strain in the recoverable region is accommodated by both motion of existing twin boundaries within gamma(0)-phase and stress-induced phase transformation from the gamma" to the alpha" structure. The volume fraction of the gamma'-phase decreases from 100% initially to similar to 26% after 4% total strain and some reversion is observed on release. The initial stress state of the stress-induced alpha" grains will be discussed as well as the load sharing between the two phases. (c) 2005 Elsevier B.V. All rights reserved.

引用

页码：15 / 21

页数：7

共 25 条

[1] PHASES METASTABLES DANS LES ALLIAGES URANIUM-NIOBIUM [J].

ANAGNOSTIDIS, M ;

COLOMBIE, M ;

MONTI, H .

JOURNAL OF NUCLEAR MATERIALS, 1964, 11 (01) :67-76

[2]

[Anonymous], 1990, ADV MATER

[3] SMARTS - a spectrometer for strain measurement in engineering materials [J].

Bourke, MAM ;

Dunand, DC ;

Ustundag, E .

APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING, 2002, 74 (Suppl 1) :S1707-S1709

[4] Internal strain and texture evolution during deformation twinning in magnesium [J].

Brown, DW ;

Agnew, SR ;

Bourke, MAM ;

Holden, TM ;

Vogel, SC ;

Tomé, CN .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2005, 399 (1-2) :1-12

[5] A neutron diffraction and modeling study of uniaxial deformation in polycrystalline beryllium [J].

Brown, DW ;

Bourke, MAM ;

Clausen, B ;

Holden, TM ;

Tomé, CN ;

Varma, R .

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 2003, 34A (07) :1439-1449

[6] Uniaxial tensile deformation of uranium 6 wt pct niobium: A neutron diffraction study of deformation twinning [J].

Brown, DW ;

Bourke, MAM ;

Dunn, PS ;

Field, RD ;

Stout, MG ;

Thoma, DJ .

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 2001, 32 (09) :2219-2228

[7]

BROWN DW, 2003, UNPUB

[8] Use of Rietveld refinement for elastic macrostrain determination and for evaluation of plastic strain history from diffraction spectra [J].

Daymond, MR ;

Bourke, MAM ;

VonDreele, RB ;

Clausen, B ;

Lorentzen, T .

JOURNAL OF APPLIED PHYSICS, 1997, 82 (04) :1554-1562

[9] Use of Rietveld refinement to fit a hexagonal crystal structure in the presence of elastic and plastic anisotropy [J].

Daymond, MR ;

Bourke, MAM ;

Von Dreele, RB .

JOURNAL OF APPLIED PHYSICS, 1999, 85 (02) :739-747

[10] THE EFFECT OF QUENCH RATE ON THE MICROSTRUCTURE, MECHANICAL-PROPERTIES, AND CORROSION BEHAVIOR OF U-6 WT PCT NB [J].

ECKELMEYER, KH ;

ROMIG, AD ;

WEIRICK, LJ .

METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 1984, 15 (07) :1319-1330

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