Next Article in Journal
Studying Mechanical Properties and Micro Deformation of Ultrafine-Grained Structures in Austenitic Stainless Steel
Previous Article in Journal
The Influence of Deoxidation Practice on the As-Cast Grain Size of Austenitic Manganese Steels
Article Menu
Issue 6 (June) cover image

Export Article

Open AccessArticle
Metals 2017, 7(6), 187;

Phase Selection during Solidification of Ni-10.95 at. % and B-3.23 at. % Si Alloy

Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Saltillo, 25900 Ramos Arizpe, Coahuila, Mexico
Instituto Tecnológico de Saltillo, 25280 Saltillo, Coahuila, Mexico
Fundición de Aleaciones Especiales de Mexico S. A. de C.V., 25100 Saltillo, Coahuila, Mexico
Author to whom correspondence should be addressed.
Academic Editor: Anders E.W. Jarfors
Received: 13 February 2017 / Revised: 27 April 2017 / Accepted: 16 May 2017 / Published: 24 May 2017
View Full-Text   |   Download PDF [16981 KB, uploaded 25 May 2017]   |  


To gain insight into the solidification of the Ni-10.95 at. % and B-3.23 at. % Si alloy, 29 cast samples extracted from a casting of this alloy were remelted under an Ar atmosphere, using either DSC or an in-house thermal analysis apparatus. Ni(fcc) and Ni3B phases were identified by X-ray diffraction of both the remelted and original cast samples; however, microstructural differences were observed between the two. These microstructural differences are associated with the high undercooling observed during the eutectic reaction in the remelted samples. This high undercooling results from the difficulty of Ni3B nucleation, which allows the formation of a NixBy metastable phase. Metallographic inspection shows that the metastable phase solidifies at least partially through a non-cooperative growth mechanism. This metastable phase may be the elusive Ni23B6 phase. The melting temperature of the metastable phase is 985 °C, and it solidifies below 943 °C under the experimental conditions used in this study. The temperature of solid transformation of the metastable constituent to Ni3B and Ni is strongly dependent on the amount of Ni3B formed during solidification. The minimal temperature of such transformation, 834 °C, corresponds to samples where Ni3B solidification was not detected in the thermal curves. View Full-Text
Keywords: thermal analysis; microstructure; metastable phase thermal analysis; microstructure; metastable phase

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

Share & Cite This Article

MDPI and ACS Style

Fraga-Chávez, K.L.; Castro-Román, M.J.; Herrera-Trejo, M.; Ramírez-Vidaurri, L.E.; Aguilera-Luna, I. Phase Selection during Solidification of Ni-10.95 at. % and B-3.23 at. % Si Alloy. Metals 2017, 7, 187.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics



[Return to top]
Metals EISSN 2075-4701 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top