2020
DOI: 10.1016/j.actamat.2020.09.026
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On the thermodynamic analysis of martensite stabilization treatments

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Cited by 25 publications
(23 citation statements)
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“…As can be seen in Table 1, γ-α MT during heating-cooling in a free state, is associated with thermoelastic MT of the second type, in which A s ≤ M s [29,30,41]. Another feature is the large value of overcooling ∆M = M s − M f , with a forward γ-α MT and overheating of ∆A = A f − A s with a reverse α -γ MT, varying from 50 to 74 K in combination with low values of thermal hysteresis, ∆T h = A f − M s = 18-40 K. According to the results of thermodynamic analysis for the thermoelastic MT of the second type [41][42][43][44][45], the ratio of the stored elastic energy, ∆G el , is equal to or exceeds the doubled value of the dissipated energy, 2∆G dis , ∆G el ≥ 2∆G dis . The values of ∆G el and ∆G dis are estimated from the relationships obtained in [33,[41][42][43][44][45]:…”
Section: Crystalmentioning
confidence: 99%
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“…As can be seen in Table 1, γ-α MT during heating-cooling in a free state, is associated with thermoelastic MT of the second type, in which A s ≤ M s [29,30,41]. Another feature is the large value of overcooling ∆M = M s − M f , with a forward γ-α MT and overheating of ∆A = A f − A s with a reverse α -γ MT, varying from 50 to 74 K in combination with low values of thermal hysteresis, ∆T h = A f − M s = 18-40 K. According to the results of thermodynamic analysis for the thermoelastic MT of the second type [41][42][43][44][45], the ratio of the stored elastic energy, ∆G el , is equal to or exceeds the doubled value of the dissipated energy, 2∆G dis , ∆G el ≥ 2∆G dis . The values of ∆G el and ∆G dis are estimated from the relationships obtained in [33,[41][42][43][44][45]:…”
Section: Crystalmentioning
confidence: 99%
“…An analysis of the SE loops for Crystals I-IV in the temperature range from Ms to 373 K, shows that in all studied crystals, the stresses, σcr Ms , for the onset of stress-induced γ-α′ MT, are lower than the stresses, σcr As , of the start of the reverse α′-γ MT, when unloading (Figures 3 and 5). Using the results of the thermodynamic analysis of SE loops [33,[42][43][44][45], the contribution of ΔGel and ΔGdis can be determined from the values of σcr Ms , σcr Mf and σcr As , σcr Af : ΔGel = (σcr Mf (T) − σcr Ms (T))εtr ( 5) ΔGdis = ½(σcr Mf (T) − σcr As (T))εtr ( 6) In Crystals III and IV, an increase in the ageing time at the second step to 4 h at 873 K, as shown above, increases the volume fraction of β-phase particles in comparison with Crystals I and II. As a result, the SE decreases, while ∆σ and Θ, on the contrary, increase and an irreversible strain appears of up to 0.5% at temperatures above A f (Figure 5).…”
Section: Se and Sme In The [001]-oriented Fenicoalnb Crystals Aged Un...mentioning
confidence: 99%
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“…This increase in MT temperature interval is the result of an increase in stored elastic energy during direct MT due to a high density of compound twins and detwinning processes. Thus, the TTs can be expressed as follows, taking into account the effect of elastic and dissipative energy and the presence of external applied stresses [4,6,22]:…”
Section: Discussionmentioning
confidence: 99%
“…Thus, the main subject of our paper is to provide a simple thermodynamic analysis, based on our local equilibrium formalism [24,25]. In contrast to [21], we investigate the stability conditions always for a first order transformation, which is in line with [22,23].…”
Section: Introductionmentioning
confidence: 99%