Subsequent to the completion of an extensive investigation on the behaviour of thermal expansion of iron -primarily in the range of the two stages of phase transformation of the first order (1) -the intention of the present work is to apply the method of dilatometric analysis to a study of the stages of phase transformation of the second order. As has been shown by Williams (2) as well a s Esser and Eusterbrock (3) with nickelor iron respectively a slight anomaly at the Curie temperature is discernible in the course of the linear thermal expansion coefficient. An interpretation of this effect can be based, according to Dehlinger (4), on the assumption that a variation of volume magnetostriction due to the decrease of the magnetization gives a contribution to the thermal change in volume at temperatures near the Curie point. This leads to a method for the determination of magnetostriction uM, defined as the relative change in volume, taking place during the isothermal transition from the non-ferromagnetic into the ferromagnetic state (5, 6).According to C a r r (6) aM is given by where T is the absolute temperature and fi of thermal expansion at constant field H and constant magnetization M respectively.
Ermittlung der Gitterkonstanten geordneter Eisen‐Silicium‐Legierungen durch röntgenographische und Dichtemessungen. Untersuchung des Einflusses der Abkühlungsgeschwindigkeit auf den Ordnungsgrad zur Abschätzung der Unterdrückbarkeit der Ordnung durch Abschrecken.
Dilatometrische Messungen zwischen −200 und 500 °C an Eisen‐Nickel‐, Eisen‐Mangan‐ und Eisen‐Mangan‐Nickel‐Legierungen. Einfluß von Kohlenstoff, Chrom und Kupfer auf Wärmeausdehnung und magnetische Eigenschaften. Ermittlung der Volumenmagnetostriktion an den ferromagnetisch und antiferromagnetisch geordneten Legierungen. Vergleich der relativen Längenänderung zwischen 20 und −200 °C bei verschiedenen Werkstoffen.
Beschreibung des verwendeten adiabatischen Hochtemperaturkalorimeters. Wahre und mittlere spezifische Wärmekapazität zwischen 50 und 400 bzw. 650°C der Stähle St 35, 13 CrMo 4 4, 10 CrMo 9 10, X 20 CrMoV 12 1, 12 Ni 19 und X 8 Ni 9. Ergänzende Untersuchungen an dem ferritisch‐austenitischen Stahl X 20 CrNiSi 25 4. Aufspaltung der Meßwerte in den Anteil nach Debye sowie in den anharmonischen, elektronischen und magnetischen Beitrag zur spezifischen Wärmekapazität.
Benchmark tests for measuring thermophysical properties of monocrystalline Ni‐base alloys have been conducted. Samples of the same batch of alloys were tested in six different laboratories using a variety of techniques to measure e.g., density, linear thermal expansion, specific heat capacity, thermal diffusivity, and thermal conductivity as a function of temperature. The results of these direct measurements and the derived properties are compared and discussed.
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