Micro and Semimicro Differential Thermal Analysis (μ.D.T.A.).

Mazières, C.

doi:10.1021/ac60209a014

Cited by 44 publications

(7 citation statements)

References 5 publications

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“…La t~te de mesure [7] est repr6sent6e sur la figure 2. Chaque thermocouple A, Bet T est constitu6 par un creuset de platine/t la base duquel sont soud6s les ills du thermocouple, p+ et p_, en alliage de platinel (fern ~40 #V.~ L'6chantillon S est contenu darts un microcreuset C en platine qui s'adapte en contact 6troit aux patois internes du thermocouple A.…”

Section: Technique Calorimotriqueunclassified

Etalonnage calorimetrique d'un microanalyseur thermique differentiel entre — 180 et 950 ‡C. application a la determination experimentale de l'enthalpie des transformations structurales α′→γ et γ→α′ dans les alliages fer-nickel

Harmelin

Chappuis

Lehr

1979

Journal of Thermal Analysis

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Thermal effects of the ~' --+ )) structure transformation during heating and that of --~ ~' during cooling (martensitic transformation) were determined in a series of highpurity iron-nickel alloys containing 20--31 per cent nickel with a differential thermal microanalyzer used as microcalorimeter.The calorimetric calibration of the DTA apparatus was carried out in the range from --180 ~ up to 950 ~ on the basis of solid-solid or solid-liquid phase transformations of 18 mineral or organic compounds selected as standards.The transformation enthalpies of the thermal effects were calculated from the correlation Tf Tf [AH]rs = M/m[Q]T~ Tfwhere M: mole mass of the alloy; m: sample mass; [Q]T~: thermal effect measured between the initial and final temperatures of the transformation. While the nickel content increases from 20 up to 31 percent, the enthalpy of the martensitic transformation AH~, decreases from 820 to 310 cal 9 mole -1 for cooling, and the enthalpy of the reverse transformation AH~,~ for heating decreases from 480 to 330 cal 9 mole-L L'existence d'une relation de proportionnalit6 entre l'effet thermique 1i6 au changement de phase d'un 6chantillon et l'aire du pic d'analyse thermique diff6-rentielle qui lui est associ6 prdsente un int6rat consid6rable sur le plan exp6ri-mental car elle permet l'6tude thermodynamique in situ des phases hors d'6quilibre qui apparaissent au cours du refroidissement continu ou se transforment au chauffage.C'est le cas des alliages fer-nickeI qui subissent une transformation structurale spontan6e au cours du refroidissement de la phase stable 5. haute temp6rature, de structure cubique 5. faces centr6es, l'aust6nite 7. Cette transformation, d6sign6e sous le nom de transformation martensitique, s'effectue par un d6placement coop6ratif de tous les atomes du r6seau cristallin, de type cisaillement [1 ]. Elle donne naissance h une phase m6tastable de structure cubique centr6e, la martensite c~'. Lots d'un nouveau chauffage, la transformation inverse ct' ~ ~ se produit.L'une des caract6ristiques de ces transformations est de s'effectuer dans un large domaine de temp6rature (une centaine de degr6s) d6fini par: 11".i.. Thermal Anal. 16, 1979

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Section: Technique Calorimotriqueunclassified

Etalonnage calorimetrique d'un microanalyseur thermique differentiel entre — 180 et 950 ‡C. application a la determination experimentale de l'enthalpie des transformations structurales α′→γ et γ→α′ dans les alliages fer-nickel

Harmelin

Chappuis

Lehr

1979

Journal of Thermal Analysis

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“…L'intdrat croissant port6 ft. la physique des solides non cristallins et les progr6s rdalisds dans les m6thodes d'Analyse Thermique Diff6rentielle depuis les travaux classiques de Tool [1] incitent /t r6examiner les possibilitds offertes par cette technique, sous sa forme "semi-micro" [2], pour le contr61e de la formation et Temperature j ~ A l'enthalpie Hen fonction de la temp6rature T de l'6volution de mat6riaux "amorphes" aux rayons X. Cet article concerne le s616nium et le s616nium-tellure (6 % at. de Te).…”

Section: (Regu Le 16 Juin 1972)unclassified

Etude de verres de se et Se-Te (6% at. Te) Par analyse thermique differentielle

Audière

Carballes

Mazières

1974

Journal of Thermal Analysis

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“…from the data in [6] and [7], In Table 1, experimental results, calculated data and literature data for specific heat and heat of transformation are listed for various materials. The value of this error can be estimated e.g.…”

Section: Atmentioning

confidence: 99%

Quantitative thermal analysis, II

Berg¹,

Egunov²

1969

Journal of Thermal Analysis

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Some problems on adjustment of the equipment and on data evaluation, in view of the equations derived earlier for the calculation of specific heat and heat of transformation are discussed. It is shown that quantitative determinations are possible also if the adjustment is "non-ideal" and that both air and an inert material, respectively, may be used as reference material.Comprehensive information and detailed recommendations are to be found in the recent literature on how to select optimum experimental conditions and equipment for thermal analysis [1--3]. In this paper we wish merely to specify some points with respect to experimental technique and equipment design, required by the application of the equations derived earlier [4] for the calculation of specific heat and heat of phase transformation.

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Micro and Semimicro Differential Thermal Analysis (μ.D.T.A.).

Abstract: Through a critical study of the various factors involved in differential thermal analysis, apparatus has been designed which permits examinationin controlled atmosphere and between -

Cited by 44 publications

References 5 publications

Etalonnage calorimetrique d'un microanalyseur thermique differentiel entre — 180 et 950 ‡C. application a la determination experimentale de l'enthalpie des transformations structurales α′→γ et γ→α′ dans les alliages fer-nickel

Etalonnage calorimetrique d'un microanalyseur thermique differentiel entre — 180 et 950 ‡C. application a la determination experimentale de l'enthalpie des transformations structurales α′→γ et γ→α′ dans les alliages fer-nickel

Etude de verres de se et Se-Te (6% at. Te) Par analyse thermique differentielle

Quantitative thermal analysis, II

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