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Effect Of Basic Physical Parameters On Engineering Properties Of Intermetallics

Report Number: WADD TR 60-184 Part 5
Author(s): J. H. Westbrook, D. L. Wood, and H. E. Grenoble
Corporate Author: General Electric Research Laboratory
Laboratory: AF Materials Laboratory
Date of Publication: 1964-03
Pages: 32
Contract: AF 33(616)-7714
Project: 7350
Task: 735001
AD Number: AD0433254

Abstract:
Ingots of nickel-rich NiAl were prepared by induction melting under argon, starting with primary materials of technical grade. Sections cut from these ingots have been hot-rolled to sheet at 1100 to 1200 degrees C by enclosing them in heavy-walled stainless steel containers. Rolled sheet sufficiently free of defects to enable preparation of mechanical test specimens is obtained. Cold-rolling of the hot-rolled sheet can be accomplished at 850 degrees C but requires a heavy reduction (about 30%) in each pass to avoid fracture.

Hot-rolled NiAl undergoes a transition to brittle behavior at about 600 degrees C. Below this temperature the mechanical properties are characterized by limited ductility, a sensitivity to surface notches, and by a flow stress that is relatively invariant in respect to temperature. Above 600 degees C, ductility increases markedly, sensitivity to surface conditions diminishes, and the flow stress becomes strongly temperature dependent. Single crystals do not exhibit a transistion in mechanical behavior and are much weaker and more ductile than polycrystalline material at temperatures below 800 degrees C. Single-crystal rods have been bent at room temperature to a maximum fiber strain of 25% without fracture. Polycrystalline material is of more limited ductility, the maximum fiber strain for fracture at room temperature being a few per cent.

Some few observations on the ductile-brittle transistion and other low-temperature properties of the compound AgMg are also included.

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