Mechanical properties of nanocrystalline metals, intermetalics and multiphase materials determined by tension, compression and disk-bend techniques

Conference · Sat Feb 01 04:00:00 EST 1997

OSTI ID:459329

Eastman, J A; Thompson, L J; DiMelfi, R J ^[1]; Dollar, M ^[2]; Weertman, J R ^[3]; Rittner, M N

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1. Argonne National Lab., IL (United States)
2. Illinois Inst. of Tech., Chicago, IL (United States)
3. Northwestern Univ., Evanston, IL (United States)

The mechanical behavior of nanocrystalline metallic, intermetallic, and multiphase materials was investigated using tension, compression, and disk-bend techniques. Nanocrystalline NiAl, Al-Al{sub 3}Zr, and Cu were synthesized by gas condensation and either resistive or electron beam heating followed by high temperature vacuum compaction. Disk- bend tests of nanocrystalline NiAl show evidence of improved ductility at room temperature in this normally extremely brittle material. In contrast, tension tests of multiphase nanocrystalline Al- Al{sub 3}Zr samples show significant increases in strength by substantial reductions in ductility with decreasing grain size. Compression tests of nanocrystalline copper result in substantially higher yield stress and total elongation values than those measured in tensile tests. Implications for operative deformation mechanisms in these materials are discussed.

• Research Organization: Argonne National Lab., IL (United States)
• Sponsoring Organization: USDOE Office of Energy Research, Washington, DC (United States)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 459329
• Report Number(s): ANL/MSD/CP--91462; CONF-970201--16; ON: DE97003231
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
COPPER
MECHANICAL PROPERTIES
NICKEL ALLOYS
POWDERS
ZIRCONIUM ALLOYS