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Effect of Cu on Amorphization of a TiNi Alloy during HPT and Shape Memory Effect after Post‐Deformation Annealing.

Shahmir, H., Nili-Ahmadabadi, M., Mohammadi, M., Huang, Y., Andrzejczuk, M., Lewandowska, M. and Langdon, T.G., 2020. Effect of Cu on Amorphization of a TiNi Alloy during HPT and Shape Memory Effect after Post‐Deformation Annealing. Advanced Engineering Materials, 22 (1), 1900387.

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DOI: 10.1002/adem.201900387

Abstract

A ternary TiNiCu memory alloy was subjected to high‐pressure torsion (HPT) followed by post‐deformation annealing (PDA) to study the effect of Cu (5 at%) on amorphization after HPT processing and also the microstructural evolution and shape memory effect (SME) after PDA. The results show that even after 20 revolutions the ternary alloy contains nanocrystalline areas and the microstructure is not fully amorphous. An easier martensite to austenite transformation and minor remaining austenite in the ternary alloy are responsible for suppressing amorphization. PDA at 673 K provides nanocrystalline microstructures containing an R‐phase with a minor martensitic B19' phase in the ternary alloy. The SME of this alloy after PDA is not as satisfactory as for the binary alloy processed through similar conditions because of the existence of a high volume fraction of the R‐phase. Nevertheless, the total recovered strain of the ternary alloy after PDA for 30 min has a maximum value of 6.5%.

Item Type:Article
ISSN:1438-1656
Additional Information:Funding Information European Research Council. Grant Number: 267464-SPDMETALS Special Issue: Dedicated to Terence G. Langdon on the Occasion of his 80th Birthday
Uncontrolled Keywords:Amorphization; nanostructured materials; severe plastic deformation; shape memory effects; TiNiCu alloys
Group:Faculty of Science & Technology
ID Code:32501
Deposited By: Unnamed user with email symplectic@symplectic
Deposited On:09 Jul 2019 08:24
Last Modified:05 Jul 2020 01:08

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