Title

Effect Of Basic Physical Parameters On Engineering Properties Of Intermetallics

Description

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°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°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°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°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°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.

Date

1964

Index Abstract

Coming Soon

Photo Quality

Complete

Report Number

WADD TR 60-184 Part V

Creator

Westbrook, J. H.

Grenoble, H. E.

Wood, D. L.

Corporate Author

General Electric Research Laboratory

Laboratory

AF Materials Laboratory

Extent

32

Identifier

AD0433254

AD0433254

Access Rights

OTS

Distribution Classification

1

Contract

AF 33(616)-7714

DoD Project

7350

DoD Task

735001

DTIC Record Exists

No

Distribution Change Authority Correspondence

None

Distribution Conflict

No

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°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°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°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°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°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.

Report Availability

Full text available

Date Issued

1964-03

Provenance

IIT

Type

report

Format

1 online resource (iv, 28 pages) : ill.

Subject

Aluminum Alloys

Sheets

Mechanical Properties

Nickel Alloys

Intermetallic Compounds

Rolling (Metallurgy)

Brittleness

Ductility

High Temperature

Crystals

Single Crystals

Magnesium Alloys

Silver Alloys

Transition Temperature

Electrolytic Polishing

Processing

Grain Structures (Metallurgy)

Deformation

Crystal Structure

Symmetry (Crystallography)

Microstructure

Publisher

Wright-Patterson Air Force Base, OH : AF Materials Laboratory, Research and Technology Division, Air Force Systems Command, United States Air Force

NTRL Accession Number

AD433254