The deformation properties of a new group of the Cu-Al-Nb (up to about 8 wt.% Nb) base alloys exhibiting the shape memory effect at elevated temperature were the subject of this work. Niobium, which solubility in copper is low, exists in these alloys in a form of primary precipitates of intermetallic phases, mainly the Nb(Cu,Al)2 Laves phase. The carried out studies have shown that the primary precipitates of the intermetallic phases on the niobium base play a basic role in a simultaneous strengthening and increase in plasticity of these alloys.
Models elaborated for the metal-matrix composite materials were modified in order to enable the control of the deformation properties of shape memory alloys containing significant number of primary particles.
The modified model of the continuum mechanics approach based on the effective medium approximations and supplemented by the dislocation plasticity model enabled analysis of the deformation course of the Cu-Al-Nb type alloys. By comparing the simulated and experimental stress – strain curves for these alloys, the effect of particle size, volume fraction and their elastic properties on the deformation response are given. With this model it can be shown that the increase in the alloy hardening during deformation results from the presence of hard and elastic particles in the martensite matrix as well as dislocations formed at the partial accommodation of the residual stresses created during the alloy quenching.

• Legal notice:
  

  Copyright (c) Pielaszek Research, all rights reserved.
  The above materials, including auxiliary resources, are subject to Publisher's copyright and the Author(s) intellectual rights. Without limiting Author(s) rights under respective Copyright Transfer Agreement, no part of the above documents may be reproduced without the express written permission of Pielaszek Research, the Publisher. Express permission from the Author(s) is required to use the above materials for academic purposes, such as lectures or scientific presentations.
  In every case, proper references including Author(s) name(s) and URL of this webpage: https://science24.com/paper/3603 must be provided.

1. Texture analysis of hot rolled Ni-Mn-Ga alloys
2. Structure and properties of high temperature nitrided/oxided surface of Ni-Ti alloy
3. Effect of deformation on structure and mechanical behavior of plycrystalline Ni-Mn-Ga alloys
4. Martensitic transformation and shape memory effect in NiTiCu strip covered by nanocrystalline platinum layer
5. Martensitic transformation in melt-spun NiMnGa ribbons