Constrained hierarchical twinning in Ru-based high temperature shape memory alloys

被引：13

作者：

Manzoni, Anna M. ^{[1
]}

Denquin, Anne ^{[1
]}

Vermaut, Philippe ^{[2
,3
]}

Prima, Frederic ^{[2
]}

Puente-Orench, Ines ^{[4
,5
]}

Pauly, Christoph ^{[6
]}

Muecklich, Frank ^{[6
]}

Portier, Richard A. ^{[2
]}

机构：

[1] Off Natl Etud & Rech Aerosp, 29 Ave Div Leclerc,BP 72, F-92322 Chatillon, France

[2] PSL Res Univ, Chim ParisTech, CNRS, IRCP, F-75005 Paris, France

[3] Univ Paris 06, Sorbonne Univ, UFR926, F-75005 Paris, France

[4] Inst Laue Langevin, 6 Rue Jules Horowitz, F-38042 Grenoble, France

[5] ICMA CSIC, Pedro Cerbuna 12, Zaragoza 50009, Spain

[6] Univ Saarland, Dept Mat Sci, Funct Mat, D-66123 Saarbrucken, Germany

来源：

ACTA MATERIALIA | 2016年 / 111卷

关键词：

Shape memory alloys; Transmission electron microscopy; EBSD; Twinning; Ru-Ta; MARTENSITIC TRANSFORMATIONS; EQUIATOMIC TARU; MICROSTRUCTURE;

D O I：

10.1016/j.actamat.2016.03.067

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The microstructure of high temperature shape memory alloys of the Ru-Ta and Ru-Nb family are investigated in detail. After cooling from the high temperature cubic 13 phase the off-stoichiometric alloys show a compound twinning in the tetragonal beta' phase which prevails at room temperature and can be observed as two levels of laminates A and C [1]. The stoichiometric alloys are characterized by a second phase transformation from beta' to monoclinic beta '', which adds another type of twinning. The latter belongs to the monoclinic P2/m structure and has been created out of one of the lost symmetry elements from the tetragonal P4/mmm phase during the beta' -> beta '' transformation. The unusual characteristic of this new twinning, called B, is the fact that it has an intermediate size between the A and C twins that belong to the high-temperature transformation beta' -> beta ''. This is due to a second constrained martensitic transformation. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：283 / 296

页数：14

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