Stress asymmetry of stoichiometric NiAl single crystals

Journal Article · Thu Apr 01 00:00:00 EST 1993 · Acta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-7151(93)90151-H· OSTI ID:6239877

Takasagu, T; Kishino, J; Hanada, S ^[1]

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1. Tohoku Univ., Sendai (Japan). Inst. for Materials Research

The yield stress properties of stoichiometric NiAl single crystals were investigated in terms of crystal orientation, temperature and the deformation mode. The calculated critical resolved shear stress (CRSS) was a strong function of crystal orientation, temperature and the deformation mode whether tension or compression. The CRSS was, in a wide range of experimental conditions, higher in the sequence of (110)(100), (100)(100) and (hk0)(100) slips. The CRSS in compression was higher particularly at low temperatures than the CRSS in tension. The tension-compression asymmetry on the CRSS was understood qualitatively as being due to the effect of the normal stress on the core structure of a (001) dislocation and a (111) dislocation. It was suggested that a compressive normal stress makes the core configuration more sessile, resulting in the increased stress effectively at low temperatures.

• OSTI ID: 6239877
• Journal Information: Acta Metallurgica et Materialia; (United States), Vol. 41:4; ISSN 0956-7151
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
MECHANICAL PROPERTIES
MICROSTRUCTURE
NICKEL ALLOYS
CRYSTAL DEFECTS
FRACTURE PROPERTIES
INTERMETALLIC COMPOUNDS
STOICHIOMETRY
TEMPERATURE DEPENDENCE
TENSILE PROPERTIES
ALLOYS
CRYSTAL STRUCTURE
360103* - Metals & Alloys- Mechanical Properties
360102 - Metals & Alloys- Structure & Phase Studies