The compositional stability of the P-phase in Ni-Ti-Pd shape memory alloys

被引：12

作者：

Coppa, Anne C. ^{[1
]}

Kapoor, Monica ^{[1
]}

Noebe, Ron ^{[2
]}

Thompson, Gregory B. ^{[1
]}

机构：

[1] Univ Alabama, Dept Met & Mat Engn, Tuscaloosa, AL 35401 USA

[2] NASA, Glenn Res Ctr, Cleveland, OH 44135 USA

来源：

INTERMETALLICS | 2015年 / 67卷

关键词：

Ni-Ti-Pd alloy; Compositional stability; P-phase; P1-phase; Atom probe tomography; TRANSMISSION ELECTRON-MICROSCOPY; PRECIPITATE PHASE; MARTENSITIC-TRANSFORMATION; CONCENTRATION GRADIENTS; SPECIMEN PREPARATION; SITE PREFERENCE; STRAIN FIELDS; MICROSTRUCTURE; RICH; BEHAVIOR;

D O I：

10.1016/j.intermet.2015.07.014

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The precipitation of the P-phase in Ni-Ti-Pd and Ni-Ti-Pt shape memory alloys has been shown to dramatically increase the martensitic transformation temperature and strength in Ni-rich ternary alloys, yet little is known about the phase's compositional stability. Therefore, the compositional limits of the P-phase have been systematically studied by varying the Pd and Ni content while maintaining the general P-phase Ti-11(Ni + Pd)(13) stoichiometry. Each alloy was solutionized at 1050 degrees C followed by water quenching, and aging at 400 degrees C for 100 h. Four distinct phases were identified by electron and x-ray diffraction: Ti2Pd3, B2 NM, P- and P1-phases. The latter precipitate phases became more stable with increasing Ni at the expense of the Pd content. Atom probe tomography revealed the P-phase composition to be 45.8Ti-29.2Ni-25Pd (at.%) or Ti-11(Ni7Pd6) as compared to the P1-phase 44.7Ti-45.8Ni -9APd (at.%) or Ti5Ni5Pd. (C) 2015 Elsevier Ltd. All rights reserved.

引用

页码：56 / 62

页数：7

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