TITLE

Effects of phase transition on the hardness of shape memory alloys

AUTHOR(S)
Guozheng Kang; Wenyi Yan
PUB. DATE
June 2009
SOURCE
Applied Physics Letters;6/29/2009, Vol. 94 Issue 26, p261906
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Based on the dimensional analysis and finite element calculations, the effects of phase transition on the hardness of shape memory alloys were unveiled. It is shown that the hardness of shape memory alloys increases with the increase in the phase transition stress, the increase in the plastic yield stress, and the decrease in the maximum transition strain. However, the ratio of the hardness to the phase transition stress or the ratio of the hardness to the plastic yield stress is not a constant and therefore, the hardness of shape memory alloys cannot be treated as a material property.
ACCESSION #
42961967

 

Related Articles

  • Characteristic of microscopic shape memory effect in a CuAlNi alloy by nanoindentation. Cheng Liu; Yapu Zhao; Qingping Sun; Tongxi Yu; Zexian Cao // Journal of Materials Science;Mar2005, Vol. 40 Issue 6, p1501 

    This article reports that shape memory alloys (SMA) can recover large inelastic strains, up to 8% tensile strain for NiTi alloys and 4% for CuAlNi alloys, either by heating or by stress removal. Both are the result of martensitic phase transformation. Recently, SMA and their thin films have been...

  • Evolutions of microstructure and phase transformation in Cu-Al-Fe- Nb/Ta high-temperature shape memory alloys. Yang Shuiyuan; Wang Cuiping; Su Yu; Liu Xingjun // Materials Science Forum;2015, Vol. 833, p67 

    The evolutions of microstructure and phase transformation behavior of Cu-Al-Fe-Nb/Ta high-temperature shape memory alloys under the quenched and aged states were investigated in this study, including Cu-10wt.% Al-6wt.% Fe, Cu-10wt.% Al-4wt.% Fe-2wt.% Nb and Cu-10wt.% Al- 4wt.% Fe-2wt.% Ta three...

  • Finite Element Analysis for the Crack Self-repairing Behavior of the Concrete Beam Embedded Shape Memory Alloy. Shuangbei Li; Qingguo Liang; Jianping Li // Applied Mechanics & Materials;2014, Issue 507, p455 

    To study the crack repair performance of shape memory alloy to the concrete beam, the SMA wire with a certain initial strain at room temperature is placed eccentrically in the concrete beam. Because of its constrained recovery stress produced during the phase transition, the driving force is...

  • On anomalous depth-dependency of the hardness of NiTi shape memory alloys in spherical nanoindentation. Yan, Wenyi; Amini, Abbas; Sun, Qingping // Journal of Materials Research;Aug2013, Vol. 28 Issue 15, p2031 

    An experimental study on the indentation hardness of NiTi shape memory alloys (SMAs) by using a spherical indenter tip and a finite element investigation to understand the experimental results are presented in this paper. It is shown that the spherical indentation hardness of NiTi SMAs increases...

  • Theory and finite element computations of a unified cyclic phase transformation model for monocrystalline materials at small strains. Stein, Erwin; Zwickert, Ole // Computational Mechanics;Sep2007, Vol. 40 Issue 3, p429 

    After a survey the refined numerical treatment and verification is presented for a rate-independent macroscopic unified PT material model (including mass conservation with respect to phase fractions and covexified free energy) by Govindjee and Miehe (Comput Methods Appl Mech Eng...

  • Metastable effects onmartensitic transformation in SMA. Auguet, C.; Isalgué, A.; Lovey, F. C.; Martorell, F.; Torra, V. // Journal of Thermal Analysis & Calorimetry;May2007, Vol. 88 Issue 2, p537 

    The behavior of shape memory alloys (SMA) allows their use as a passive smart material. In particular, the existence of a hysteretic cycle in the domain of the elementary coordinates strain-stress-temperature (σ, ε, T) suggests its application for damping in mechanical and/or in civil...

  • A thermo-mechanically coupled field model for shape memory alloys. Junker, Philipp; Hackl, Klaus // Continuum Mechanics & Thermodynamics;Nov2014, Vol. 26 Issue 6, p859 

    The impressive properties of shape memory alloys are produced by means of solid-to-solid phase transformations where thermal effects play an important role. In this paper, we present a model for polycrystalline shape memory alloys which takes full thermo-mechanical coupling into account....

  • Fracture mechanics of shape memory alloys: review and perspectives. Baxevanis, T.; Lagoudas, D. // International Journal of Fracture;Feb2015, Vol. 191 Issue 1/2, p191 

    Shape memory alloys (SMAs) are intermetallic alloys displaying recoverable strains that can be an order of magnitude greater than in traditional alloys due to their capacity to undergo a thermal and/or stress-induced martensitic phase transformation. Since their discovery, the SMA industry has...

  • A mode I fracture analysis of a center-cracked infinite shape memory alloy plate under plane stress. Baxevanis, Theocharis; Lagoudas, Dimitris // International Journal of Fracture;Jun2012, Vol. 175 Issue 2, p151 

    The problem of a center plane crack in an infinite, thin, pseudoelastic Shape Memory Alloy (SMA) plate subjected to an in-plane uniform tensile stress at infinity is analyzed. The analysis follows closely the Dugdale-Barenblatt model developed for conventional metals. It is found for low remote...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics