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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 652-654In Situ Study of Stress-Induced Martensitic...

In Situ Study of Stress-Induced Martensitic Transformation in Ni₄₇Ti₄₄Nb₉ Shape-Memory Alloys

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Abstract:

The stress-induced martensitic transformation in Ni₄₇Ti₄₄Nb₉ was examined using X-ray diffraction (XRD) during in situ uniaxial loading and unloading. A new martensitic (020) peak in XRD patterns is observed under strain from 10% to 12%. It indicates that the martensitic texture has reached the optimum orientation. After unloading, approximately 8% irreversible strain still remains. It is associated with the reorientation of martensites and the plastic deformation of the B2-phase. In addition, the deformed β-Nb particles would also reduce the driving force for the reverse transformation. The details of lattice-strain and shared applied stress (SAS) in the B2-phase and β-Nb phase are also discussed in this work.

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Advances in Materials and Materials Processing

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Periodical:

Advanced Materials Research (Volumes 652-654)

Pages:

1096-1101

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.652-654.1096

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Online since:

January 2013

Authors:

Hong Tao Liu, Guang Ai Sun, Yan Dong Wang, Bo Chen, Xiao Lin Wang, Qiang Tian

Keywords:

In Situ Tensile Loading and Unloading, Martensitic Transformation (MT), Ni₄₇Ti₄₄Nb₉, Shape Memory Alloy (SMA), X-Ray Diffraction (XRD)

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© 2013 Trans Tech Publications Ltd. All Rights Reserved

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