skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Confined martensitic phase transformation kinetics and lattice dynamics in Ni–Co–Fe–Ga shape memory alloys

Abstract

Here we describe insights into the phase transformation kinetics and lattice dynamics associated with the newly discovered confined martensitic transformation, which are of great significance to the in-depth understanding of the phase transformation behavior responsible for the rich new physical phenomena in shape memory alloys and could shed light on the design of novel multifunctional properties through tuning the confined martensitic transformation.

Authors:
; ; ; ; ; ; ; ; ORCiD logo
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
Foreign
OSTI Identifier:
1245857
Resource Type:
Journal Article
Resource Relation:
Journal Name: Acta Materialia; Journal Volume: 110; Journal Issue: C
Country of Publication:
United States
Language:
ENGLISH

Citation Formats

Cong, Daoyong, Rule, Kirrily Clair, Li, Wen-Hsien, Lee, Chi-Hung, Zhang, Qinghua, Wang, Haoliang, Hao, Yulin, Wang, Yandong, and Huang, E-Wen. Confined martensitic phase transformation kinetics and lattice dynamics in Ni–Co–Fe–Ga shape memory alloys. United States: N. p., 2016. Web. doi:10.1016/j.actamat.2016.03.008.
Cong, Daoyong, Rule, Kirrily Clair, Li, Wen-Hsien, Lee, Chi-Hung, Zhang, Qinghua, Wang, Haoliang, Hao, Yulin, Wang, Yandong, & Huang, E-Wen. Confined martensitic phase transformation kinetics and lattice dynamics in Ni–Co–Fe–Ga shape memory alloys. United States. doi:10.1016/j.actamat.2016.03.008.
Cong, Daoyong, Rule, Kirrily Clair, Li, Wen-Hsien, Lee, Chi-Hung, Zhang, Qinghua, Wang, Haoliang, Hao, Yulin, Wang, Yandong, and Huang, E-Wen. 2016. "Confined martensitic phase transformation kinetics and lattice dynamics in Ni–Co–Fe–Ga shape memory alloys". United States. doi:10.1016/j.actamat.2016.03.008.
@article{osti_1245857,
title = {Confined martensitic phase transformation kinetics and lattice dynamics in Ni–Co–Fe–Ga shape memory alloys},
author = {Cong, Daoyong and Rule, Kirrily Clair and Li, Wen-Hsien and Lee, Chi-Hung and Zhang, Qinghua and Wang, Haoliang and Hao, Yulin and Wang, Yandong and Huang, E-Wen},
abstractNote = {Here we describe insights into the phase transformation kinetics and lattice dynamics associated with the newly discovered confined martensitic transformation, which are of great significance to the in-depth understanding of the phase transformation behavior responsible for the rich new physical phenomena in shape memory alloys and could shed light on the design of novel multifunctional properties through tuning the confined martensitic transformation.},
doi = {10.1016/j.actamat.2016.03.008},
journal = {Acta Materialia},
number = C,
volume = 110,
place = {United States},
year = 2016,
month = 9
}
  • The effect of the alloying element Indium (In) on the martensitic transition, magnetic properties, and phase stabilities of Ni{sub 8}Mn{sub 6}Sn{sub 2−x}In{sub x} shape memory alloys has been investigated using the first-principles pseudopotential plane-wave method based on density functional theory. The energy difference between the austenitic and martensitic phases was found to increase with increasing In content, which implies an enhancement of the martensitic phase transition temperature (T{sub M}). Moreover, the formation energy results indicate that In-doping increases the relative stability of Ni{sub 8}Mn{sub 6}Sn{sub 2−x}In{sub x} both in austenite and martensite. This results from a reduction in density ofmore » states near the Fermi level regions caused by Ni-3d–In-5p hybridization when Sn is replaced by In. The equilibrium equation of state results show that the alloys Ni{sub 8}Mn{sub 6}Sn{sub 2−x}In{sub x} exhibit an energetically degenerated effect for an In content of x = ∼1.5. This implies the coexistence of antiparallel and parallel configurations in the austenite.« less
  • The present paper contains an investigation of the mechanical energy associated with the transformation of the stress-induced martensite, ..beta..', to the parent phase, ..beta.., during the shape recovery (SR) of a deformed shape-memory (SM) material. We describe a heat-mechanical energy converter, or solid-state engine, which operates by this SR phenomenon. The energy output of such an engine is expressed in terms of a fraction ..cap alpha.. of the latent heat ..delta..H of the martensitic reaction. This ..cap alpha.. is found to depend on two parameters. One is the difference between the ..delta..H of the ..beta..' ..-->.. ..beta.. reaction and themore » ..delta..H of the transformation of the quench-induced martensite, ..gamma..', to ..beta.., the other is the fraction of ..gamma..' which can be transformed via the channel ..gamma..' ..-->.. ..beta..' ..-->.. ..beta.. instead of the direct channel ..gamma..' ..-->.. ..beta... Moreover, it is shown that within certain ranges of temperature T and applied strain epsilon, the heat-mechanical energy balance equation leads to an expression identical in form to the Clapeyron-Clausius equation, which is usually valid for a first-order transition. Within these epsilon and T ranges the coefficient ..cap alpha.. is also found to be equal to log (T/sub csigma//T/sub c/) where T/sub csigma/ and T/sub c/ are the SR critical temperatures with and without the presence of an applied stress sigma, respectively. We discuss the role of the ..gamma..' martensite in this process and explain the so-called two-way SR phenomenon. In addition, the parameters that limit the output of the SR energy are evaluated. This output depends sensitively on both ..cap alpha.. and the material characteristic temperature h = C/sup -1/..delta..H, where C is the specific heat. For a solid-state engine made with the Ni-Ti SM alloy, the efficiency is found to be limited to about 5%.« less
  • The present paper contains an investigation of the mechanical energy associated with the transformation of the stress-induced martensite, ..beta..', to the parent phase, ..beta.., during the shape recovery (SR) of a deformed shape-memory (SM) material. We describe a heat-mechanical energy converter, or solid-state engine, which operates by this SR phenomenon. The energy output of such an engine is expressed in terms of a fraction ..cap alpha.. of the latent heat ..delta..H of the martensitic reaction. This ..cap alpha.. is found to depend on two parameters. One is the difference between the ..delta..H of the ..beta..' ..-->.. ..beta.. reaction and themore » ..delta..H of the transformation of the quench-induced martensite, ..gamma..', to ..beta.., the other is the fraction of ..gamma..' which can be transformed via the channel ..gamma..' ..-->.. ..beta..' ..-->.. ..beta.. instead of the direct channel ..gamma..' ..-->.. ..beta... Moreover, it is shown that within certain ranges of temperature T and applied strain epsilon, the heat-mechanical energy balance equation leads to an expression identical in form to the Clapeyron-Clausius equation, which is usually valid for a first-order transition. Within these epsilon and T ranges the coefficient ..cap alpha.. is also found to be equal to log(T/sub c sigma//T/sub c/) where T/sub c sigma/ and T/sub c/ are the SR critical temperatures with and without the presence of an applied stress sigma, respectively. We discuss the role of the ..gamma..' martensite in this process and explain the so-called two-way SR phenomenon. In addition, the parameters that limit the output of the SR energy are evaluated. This output depends sensitively on both ..cap alpha.. and the material characteristic temperature h = C/sup -1/..delta..H, where C is the specific heat. For a solid-state engine made with the Ni-Ti SM alloy, the efficiency is found to be limited to about 5%.« less
  • Many unusual thermomechanical properties of shape-memory alloys are directly connected with martensitic type phase transitions in these systems. Because the martensitic transformations, as a rule, are the first order transitions, a special attention should be given to a hysteretic behavior of shape-memory alloys. The most important characteristics of the temperature- or stress-induced martensitic transformation, have been previously studied in detail. It has been shown that such macroscopic state variables as inelastic strain or volume fraction of the martensite are always complex multi-valued functions of the temperature and external stress. Therefore, the shape-memory alloys should be considered as systems having anmore » infinite number of state equations, representing inelastic strain and volume fraction of martensite as functions of the external stress and temperature, correspondingly. Some of the phenomenological approaches for the thermomechanical state equations for shape memory alloys were recently published. In particular, a special type of differential equation describing evolution of the inelastic macroscopic strain and volume fraction of martensite as a function of the temperature has been proposed. Its application to partial temperature cycling processes in shape-memory alloys and some other problems associated with the irreversible processes caused by hysteresis are discussed in the present paper.« less
  • Stacking faults are often found in fcc alloys with low stacking fault energy and have been known to play an important role in both plastic deformation and phase transformations, particularly the fcc{yields}hcp martensitic transformation. In 1975, Brook et al. reported that the extending and contracting of stacking faults might be one of the mechanisms of the shape memory effect. However, no detailed explanation was given. The present work is a detailed analysis of the behavior of stacking faults under an applied stress and discussion of its relation to pseudoelasticity, the shape memory effect and the fcc{yields}hcp martensitic transformation.