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Title: The effect of Mn on the activities of Fe, Ni, and Cr in an Fe-Ni-Cr base alloy

Abstract

A combination Knudsen cell-mass spectrometer apparatus developed by the Bureau of Mines is accurate enough to permit the activity of many alloy components to be measured directly as the ratio of the ion currents of an appropriate isotope evaporated from the alloy and from the pure component. This apparatus has been used to determine the activities of Fe, Ni, and Cr as functions of temperature in 71Fe-20Ni-6Cr-3Mn (at. pct). A comparison of the data with data obtained earlier from other Fe-Ni-Cr base alloys indicates that partial substitution of Mn for Cr causes the activity coefficient of Fe to decrease and to deviate negatively above 1,550 K. The activity coefficient of Ni is markedly increased by the substitution decreases both the activity coefficient of Cr and the temperature dependence of this coefficient. The oxidation behavior of Fe-Ni-Cr base alloys, the stability of the austenitic phase in such alloys, and the Ni equivalent of Mn are discussed in light of these changes in activity coefficient.

Authors:
 [1]
  1. Bureau of Mines, Washington, DC (United States). Div. of Mineral Commodities
Publication Date:
OSTI Identifier:
5631297
Resource Type:
Journal Article
Journal Name:
Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States)
Additional Journal Information:
Journal Volume: 24:11; Journal ID: ISSN 0360-2133
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CHROMIUM ALLOYS; THERMODYNAMIC ACTIVITY; IRON BASE ALLOYS; MANGANESE; METALLURGICAL EFFECTS; MANGANESE ALLOYS; NICKEL ALLOYS; AUSTENITE; MATERIAL SUBSTITUTION; OXIDATION; REACTION KINETICS; STABILITY; VAPOR PRESSURE; ALLOYS; CARBON ADDITIONS; CHEMICAL REACTIONS; ELEMENTS; IRON ALLOYS; KINETICS; METALS; PHYSICAL PROPERTIES; THERMODYNAMIC PROPERTIES; TRANSITION ELEMENTS; 360104* - Metals & Alloys- Physical Properties

Citation Formats

Lee, M C.Y. The effect of Mn on the activities of Fe, Ni, and Cr in an Fe-Ni-Cr base alloy. United States: N. p., 1993. Web. doi:10.1007/BF02646517.
Lee, M C.Y. The effect of Mn on the activities of Fe, Ni, and Cr in an Fe-Ni-Cr base alloy. United States. https://doi.org/10.1007/BF02646517
Lee, M C.Y. 1993. "The effect of Mn on the activities of Fe, Ni, and Cr in an Fe-Ni-Cr base alloy". United States. https://doi.org/10.1007/BF02646517.
@article{osti_5631297,
title = {The effect of Mn on the activities of Fe, Ni, and Cr in an Fe-Ni-Cr base alloy},
author = {Lee, M C.Y.},
abstractNote = {A combination Knudsen cell-mass spectrometer apparatus developed by the Bureau of Mines is accurate enough to permit the activity of many alloy components to be measured directly as the ratio of the ion currents of an appropriate isotope evaporated from the alloy and from the pure component. This apparatus has been used to determine the activities of Fe, Ni, and Cr as functions of temperature in 71Fe-20Ni-6Cr-3Mn (at. pct). A comparison of the data with data obtained earlier from other Fe-Ni-Cr base alloys indicates that partial substitution of Mn for Cr causes the activity coefficient of Fe to decrease and to deviate negatively above 1,550 K. The activity coefficient of Ni is markedly increased by the substitution decreases both the activity coefficient of Cr and the temperature dependence of this coefficient. The oxidation behavior of Fe-Ni-Cr base alloys, the stability of the austenitic phase in such alloys, and the Ni equivalent of Mn are discussed in light of these changes in activity coefficient.},
doi = {10.1007/BF02646517},
url = {https://www.osti.gov/biblio/5631297}, journal = {Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States)},
issn = {0360-2133},
number = ,
volume = 24:11,
place = {United States},
year = {Mon Nov 01 00:00:00 EST 1993},
month = {Mon Nov 01 00:00:00 EST 1993}
}