Pseudo-Plastic Behaviour of Single-Crystals of Cu-Base Memory Alloys

Prieb, V.; Steckmann, H.

doi:10.1051/jp4/199558907

Cited by 4 publications

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“…Driving forces in this transformation are the difference between Gibbs free energy (zIG) of austenitic parents and martensitic phase. As it is known zIG consists of two fundamental components: chemical energy (ziGh) -depending on temperature (7) and non-chemical component (z1G) which depends on martensitic fraction (z).zIG can be described by WDM.AT (4) where zis and AT are the entropy and width of the thermal hysteresis at z=O, 5, while hysteresis slope reflecting elastic energy accumulated in the low temperature phase can be characterised, as suggested in Ref [4], by elastic coefficient k/M and kTMA -see equation (5) …”

Section: Introductionmentioning

confidence: 99%

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<title>Changes of thermal hysteresis during homogenisation process of Ni-Mn-Ga polycrystalline alloy</title>

Breczko

Bramowicz

2006

SPIE Proceedings

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In this paper we present results of the investigation of polycrystalline Ni52,2Mn21,3Ga265 alloy before and after homogenisation at 1173K processed for different time intervals. We investigated the influence of duration of homogenisation on kinetics of reversible martensitic transformation (RMT). In order to present changes of kinetics of RMT, thermal hysteresis was determined based on calorimetric (DSC) investigation. Our results suggested that thermal annealing at I I 73K caused plastic deformation of crystal lattice in the investigated alloy.

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Section: Introductionmentioning

confidence: 99%

“…The angle of hysteresis slope is equivalent to elastic strain energy (non-chemical) accumulated in the martensitic phase. Hysteresis central line describes thermoelastic equilibrium line, which is "free" from internal friction [1during full cycle ofreversible martensitic transformation can by described by equation (4)[4]:…”

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confidence: 99%