Study of the brittle-to-ductile transition in NiAl by texture analysis

Journal Article · Wed Feb 01 04:00:00 EST 1995 · Acta Metallurgica et Materialia

DOI:https://doi.org/10.1016/0956-7151(94)00273-K· OSTI ID:27894

Margevicius, R W; Cotton, J D ^[1]

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1. Los Alamos National Lab., NM (United States). Materials Science and Technology Div.

Polycrystalline NiAl displays a brittle-to-ductile transition temperature (BDTT) at the relatively low temperature of 0.3 T{sub m}. Explanations of the low BDTT generally suffer from uncertainties in measuring bulk deformation mechanisms in post-deformation thin foils. Therefore, the present study emphasizes the bulk measurement of deformation mechanisms by interpretation of experimental and computer simulated textures. While NiAl develops a {l_brace}110{r_brace} fiber texture during elevated temperature extrusion, subsequent uniaxial deformation of NiAl below the recrystallization temperature results in no texture evolution. This can only occur if the active deformation mechanisms produce no crystal rotation, consistent with the reported <100>{l_brace}011{r_brace} slip system. Activation of any secondary slip systems are activated at the BDTT in polycrystalline NiAl and that diffusional processes are responsible for the increased plasticity.

• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 27894
• Journal Information: Acta Metallurgica et Materialia, Journal Name: Acta Metallurgica et Materialia Journal Issue: 2 Vol. 43; ISSN 0956-7151; ISSN AMATEB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
BRITTLE-DUCTILE TRANSITIONS
BRITTLENESS
CRYSTAL STRUCTURE
DEFORMATION
DIFFUSION
DISLOCATIONS
INTERMETALLIC COMPOUNDS
METALLURGICAL EFFECTS
NICKEL ALLOYS
SLIP
TEXTURE