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Density of Liquid Ni-Ti and a New Optical Method for its Determination

Brillo, Jürgen and Schumacher, Tom and Kajikawa, Koji (2018) Density of Liquid Ni-Ti and a New Optical Method for its Determination. Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science, pp. 1-12. Springer. doi: 10.1007/s11661-018-5047-8. ISSN 1073-5623.

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Liquid Ni-Ti alloys were processed in a containerless way using the technique of electromagnetic levitation in order to determine their densities. An improved optical method was utilized where, in addition to recording shadowgraph images from the side, a second camera recorded images of the sample from the top. A correction factor for the density was calculated from the top-view images. This method yields measurements insensitive to droplet rotation and static deformation which removes the need to assume axial symmetry. The measured densities are discussed in terms of the molar volume. A negative molar excess volume was obtained, indicating that Ni-Ti is a highly non-ideal system. These measurements were then used to test a recently proposed relationship between the molar excess volume, the excess free energy, and the isothermal compressibility. For the first time, the excess volume of a binary alloy, i.e., Ni-Ti, is adequately predicted by a thermodynamic model.

Item URL in elib:https://elib.dlr.de/124089/
Document Type:Article
Title:Density of Liquid Ni-Ti and a New Optical Method for its Determination
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Brillo, JürgenJuergen.Brillo (at) dlr.deUNSPECIFIED
Schumacher, Tomtom-s-92 (at) web.deUNSPECIFIED
Kajikawa, Kojikoji_kajikawa (at) jsw.co.jpUNSPECIFIED
Journal or Publication Title:Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1007/s11661-018-5047-8
Page Range:pp. 1-12
Keywords:Density Liquid Ti-Ni alloys Thermophysical properties Electromagnetic levitation New optical method Excess volume Thermodynamic model
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Research under Space Conditions
DLR - Research area:Raumfahrt
DLR - Program:R FR - Research under Space Conditions
DLR - Research theme (Project):R - Materials Research and Microgravity (MuM)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space
Deposited By: Brillo, Dr.rer.nat. Jürgen
Deposited On:03 Dec 2018 16:49
Last Modified:06 Sep 2019 15:21

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