Analytical TEM investigations on concentration gradients surrounding Ni4Ti3 precipitates in Ni-Ti shape memory material

被引：65

作者：

Yang, ZQ ^{[1
]}

Tirry, W ^{[1
]}

Schryvers, D ^{[1
]}

机构：

[1] Univ Antwerp, EMAT, B-2020 Antwerp, Belgium

来源：

SCRIPTA MATERIALIA | 2005年 / 52卷 / 11期

关键词：

NiTi; concentration; EELS; EFTEM; EDX;

D O I：

10.1016/j.scriptamat.2005.02.013

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Concentration gradients surrounding Ni4Ti3 Precipitates grown by appropriate annealing in a Ni51Ti49 B2 austenite matrix are investigated by a combination of analytical TEM techniques. A Ni depleted zone in the surrounding matrix up to 150 nm away from the matrix-precipitate interface was detected. The size and concentration change of the depletion zone perfectly compensate for the excess Ni in the precipitate. Moreover, since different precipitates are often found in nanoscale proximity, depletion zones from different precipitates can reinforce one another in certain regions. (c) 2005 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：1129 / 1134

页数：6

共 16 条

[1] The mechanism of multistage martensitic transformations in aged Ni-rich NiTi shape memory alloys [J].