|Confined martensitic phase transformation kinetics and lattice dynamics in Ni-Co-Fe-Ga shape memory alloys|
|Cong, Daoyong; Rule, Kirrily Clair; Li, Wen-Hsien; Lee, Chi-Hung; Zhang, Qinghua; Wang, Haoliang; Hao, Yulin; Wang, Yandong; Huang, E-Wen; Huang, EW (reprint author), Natl Chiao Tung Univ, Dept Mat Sci & Engn, 1001 Univ Rd, Hsinchu 30010, Taiwan.
|Source Publication||ACTA MATERIALIA
|Abstract||Insights into the phase transformation kinetics and lattice dynamics associated with the newly discovered confined martensitic transformation 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. Here, we employ in-situ elastic and inelastic neutron scattering techniques to reveal the characteristics of transformation kinetics and lattice dynamics in two Ni55-xCoxFe18Ga27 magnetic shape memory alloys with x = 5.5 and 6.5. With a remarkable difference in transformation temperature, these two alloys show similar vibrational properties. Phonon softening of the TA(2)[xi xi 0] phonon branch, manifested as a dip at xi similar to 033 on the phonon dispersion curves, was disclosed by inelastic neutron scattering experiments; but this phonon softening is much less pronounced than that observed in stoichiometric Ni2MnGa or near-stoichiometric Ni-Fe-Ga Heusler alloys. The dispersion curves for the TA(2)[xi xi 0] phonon branch are only weakly dependent on temperature. The less pronounced phonon softening and very weak temperature dependence of the phonon dispersion curves could be attributed to the martensitic transformation which is confined by local inhomogeneities. This confined martensitic transformation shows a sluggish nature and occurs in a broad temperature range. The sluggish transformation was evidenced by the existence of residual austenite at low temperatures far below the martensitic transformation start temperature. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.|
; zhang, qinghua
; wang, yandong] univ sci & technol beijing, state key lab adv met & mat, beijing 100083, peoples r china
; [rule, kirrily clair] australian nucl sci & technol org, bragg inst, locked bag 2001, kirrawee dc, nsw 2232, australia
; [li, wen-hsien
; lee, chi-hung] natl cent univ, dept phys, jhongli 32001, taiwan
; [zhang, qinghua] beijing inst technol, sch mat sci & engn, beijing 100081, peoples r china
; [wang, haoliang
; hao, yulin] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china
; [huang, e-wen] natl chiao tung univ, dept mat sci & engn, 1001 univ rd, hsinchu 30010, taiwan
|Keyword||Shape Memory Alloy
In-situ Neutron Diffraction
Inelastic Neutron Scattering
High-energy X-ray Diffraction
|Subject Area||Materials Science
; Metallurgy & Metallurgical Engineering
|Funding Organization||National Basic Research Program of China (973 Program) [2012CB619405]; National Natural Science Foundation of China ; Ministry of Science and Technology Programs [104-2628-E-009-003-MY3, MOST 103-2739-M-213-001-MY3]; Atomic Energy Council (AEC) [104A0235EJ]; National Synchrotron Radiation Research Center (NSRRC) Neutron Program; Bragg Institute, Australian Nuclear Science and Technology Organisation
|Corresponding Author||Huang, EW (reprint author), Natl Chiao Tung Univ, Dept Mat Sci & Engn, 1001 Univ Rd, Hsinchu 30010, Taiwan.|
Cong, Daoyong,Rule, Kirrily Clair,Li, Wen-Hsien,et al. Confined martensitic phase transformation kinetics and lattice dynamics in Ni-Co-Fe-Ga shape memory alloys[J]. ACTA MATERIALIA,2016,110:200-206.
Cong, Daoyong.,Rule, Kirrily Clair.,Li, Wen-Hsien.,Lee, Chi-Hung.,Zhang, Qinghua.,...&Huang, EW .(2016).Confined martensitic phase transformation kinetics and lattice dynamics in Ni-Co-Fe-Ga shape memory alloys.ACTA MATERIALIA,110,200-206.
Cong, Daoyong,et al."Confined martensitic phase transformation kinetics and lattice dynamics in Ni-Co-Fe-Ga shape memory alloys".ACTA MATERIALIA 110(2016):200-206.
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