The effect of ternary additions on the vacancy hardening of FeAl

Journal Article · Fri Apr 15 04:00:00 EDT 1994 · Scripta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-716X(94)90559-2· OSTI ID:5264191

Kong, C H; Munroe, P R ^[1]

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1. Univ. of South Wales, Kensington (Australia). Materials Science and Engineering

It is now well-established that following high temperature heat treatments a high concentration of vacancies can be retained in ordered b.c.c. (or B2-structured) compound FeAl at room temperature, even following furnace cooling. This can result in a substantial increase in hardness, and a concomitant decrease in ductility. This anomalous hardening can be relieved by low temperature (400 C) aging during which the excess vacancies are removed. In a previous study it was shown that small nickel additions (< 1 at.%) can partially suppress the significant hardening effect in near-stoichiometric FeAl following high temperature annealing. However, these additions also produced significant increases in the equilibrium hardness following low temperature vacancy-relieving heat treatments. Further studies on these alloys revealed some compositional anomalies which may have affected some data. These previous studies were repeated and the revised data are presented. In addition, the effect of other transition metal ternary additions on vacancy hardening effects in FeAl was studies. A range of alloys with nominal composition Fe[sub 49]Al[sub 50]X[sub 1] (X = Cu, Ni, Co, Mn, Cr, V, Ti) were prepared. These alloys were subjected to both high temperature annealing and subsequent vacancy-relieving heat treatment. Their behavior was monitored by microhardness measurements and their microstructure was examined by both optical microscopy and transmission electron microscopy.

• OSTI ID: 5264191
• Journal Information: Scripta Metallurgica et Materialia; (United States), Journal Name: Scripta Metallurgica et Materialia; (United States) Vol. 30:8; ISSN 0956-716X; ISSN SCRMEX
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals &amp; Alloys-- Structure &amp; Phase Studies
360103 -- Metals &amp; Alloys-- Mechanical Properties
ALLOY SYSTEMS
ALLOYS
ALUMINIUM ALLOYS
CHROMIUM ADDITIONS
CHROMIUM ALLOYS
COBALT ADDITIONS
COBALT ALLOYS
COPPER ADDITIONS
COPPER ALLOYS
DATA
ELEMENTS
EXPERIMENTAL DATA
HARDENING
INFORMATION
IRON ALLOYS
MANGANESE ADDITIONS
MANGANESE ALLOYS
METALLURGICAL EFFECTS
METALS
MICROSTRUCTURE
NICKEL
NICKEL ADDITIONS
NICKEL ALLOYS
NUMERICAL DATA
TERNARY ALLOY SYSTEMS
TITANIUM ADDITIONS
TITANIUM ALLOYS
TRANSITION ELEMENTS
VANADIUM ADDITIONS
VANADIUM ALLOYS