Deformation of polycrystalline Ni[sub 3]Al at high strain rates and elevated temperatures

Journal Article · Tue Jun 01 00:00:00 EDT 1993 · Acta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-7151(93)90205-7· OSTI ID:6466140

Sizek, H W; Gray, III, G T ^[1]

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1. Los Alamos National Lab., NM (United States)

The mechanical response of Ni[sub 3]Al to deformation at high temperatures has long been known to exhibit a flow stress/temperature anomaly. The variations in the yield and flow stress/temperature in Ni[sub 3]Al have been widely studied at quasi-static strain rates, [dot [epsilon]] < 1s[sup [minus]1]. In this study polycrystalline Ni[sub 3]Al with 0.095 at% boron was deformed over a wide range of strain rate (0.001-8,000s[sup [minus]1]) and temperatures (77-1,273 K). Dynamic strain rate tests were conducted over the entire temperature range using a split Hopkinson bar. At 300 K the yield stress remains constant with increasing strain rate. The anomalous yield behavior is observed at [dot [epsilon]] = 3,000s[sup [minus]1]. The yield stress was found to be strain rate sensitive at temperatures > 823 K. In all cases the work hardening exhibited a rate sensitivity, increasing with increasing strain rate and decreasing with increasing temperature. In Ni[sub 3]Al deformed at all rates and at temperatures below 473 K the microstructure observed with TEM was mostly (111)(110) dislocations with coarse planar slip bands forming at the highest strain rates. As the temperature increased more (100)(110) dislocations were observed but the overall density of the dislocations decreased.

• OSTI ID: 6466140
• Journal Information: Acta Metallurgica et Materialia; (United States), Vol. 41:6; ISSN 0956-7151
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
DEFORMATION
NICKEL ALLOYS
BORON ADDITIONS
DENSITY
DISLOCATIONS
EXPERIMENTAL DATA
FLOW STRESS
INTERMETALLIC COMPOUNDS
STRAIN RATE
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0400-1000 K
TEMPERATURE RANGE 1000-4000 K
VARIATIONS
YIELD STRENGTH
ALLOYS
BORON ALLOYS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DATA
INFORMATION
LINE DEFECTS
MECHANICAL PROPERTIES
NUMERICAL DATA
PHYSICAL PROPERTIES
STRESSES
TEMPERATURE RANGE
360103* - Metals &amp; Alloys- Mechanical Properties