Title

Effect Of Basic Physical Parameters On Engineering Properties Of Intermetallics

Description

An increased hardness of grain boundary regions above that of the bulk material is found to exist generally in intermetallic compounds having a stoichiometric excess of active metal component. This hardening is shown to be associated with the anomalously high brittle-ductile transition temperature in these materials, and to be related to the "pest" phenomenon. The presence of adsorbed oxygen and/or nitrogen in grain boundary regions is found to be responsible for the increased hardness in these areas; the precise manner in which the resistance to plastic deformation is increased by this phenomenon is not clear. The effect can be modified, however, by ternary solute additions and to some extent by appropriate annealing treatments.

Date

1962

Index Abstract

Coming Soon

Photo Quality

Complete

Report Number

WADD TR 60-184 Part III

Creator

Westbrook, J. H.

Wood, D. L.

Corporate Author

General Electric Research Laboratory

Laboratory

Directorate of Materials and Processes

Extent

37

Identifier

AD0286880

AD0286880

Access Rights

OTS

Distribution Classification

1

Contract

AF 33(616)-7714

DoD Project

7350

DoD Task

735001

DTIC Record Exists

Yes

Distribution Change Authority Correspondence

None

Abstract

An increased hardness of grain boundary regions above that of the bulk material is found to exist generally in intermetallic compounds having a stoichiometric excess of active metal component. This hardening is shown to be associated with the anomalously high brittle-ductile transition temperature in these materials, and to be related to the "pest" phenomenon. The presence of adsorbed oxygen and/or nitrogen in grain boundary regions is found to be responsible for the increased hardness in these areas; the precise manner in which the resistance to plastic deformation is increased by this phenomenon is not clear. The effect can be modified, however, by ternary solute additions and to some extent by appropriate annealing treatments.

Report Availability

Full text available

Date Issued

1962-07

Provenance

IIT

Type

report

Format

1 online resource (vi, 31 pages) : ill.

Subject

Intermetallic Compounds

Aluminum Compounds

Beryllium Compounds

Brittleness

Chromium Compounds

Cobalt Compounds

Deformation

Electron Microscopy

Fracture (Mechanics)

Grain Structures (Metallurgy)

Hardness

Heat Treatment

Iridium Compounds

Magnesium Compounds

Metal Crystals

Molybdenum Compounds

Nickel Compounds

Nitrogen

Oxygen

Silicon Compounds

Silver Compounds

Tantalum Compounds

Titanium Compounds

Transition Temperature

Zirconium Compounds

Publisher

Wright-Patterson Air Force Base, OH : Directorate of Materials and Processes, Aeronautical Systems Division, Air Force Systems Command

Distribution Conflict

No