Tensile properties of mechanically alloyed/milled ODS-Ni-based alloys

Journal Article · Wed May 01 04:00:00 EDT 1996 · Metallurgical Transactions, A

DOI:https://doi.org/10.1007/BF02649874· OSTI ID:260353

Zbiral, J ^[1]

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1. Univ. of Technology Vienna (Austria)

Oxide dispersion strengthened (ODS) NiCr20 alloys were produced by ball milling blends of either prealloyed NiCr20 and yttria powders or elemental Ni and Cr powders and yttria powder. After milling, the powders were degassed in a vacuum furnace, sealed in steel cans, and consolidated by hot extrusion. The mechanical alloying process, which occurs during ball milling of elemental Ni and Cr powders, as well as the changes of microstructure, which occur during milling and extrusion, were characterized by X-ray diffraction (XRD) techniques. Measurements of microhardness, tensile strength, and elongation of extruded bars were done to gain information about the dispersoid partitioning and about the relation between milling parameters, microstructure, and tensile properties. These investigations showed that the attainable quality of ODS NiCr20 alloys is higher if they are produced by milling elemental Ni and Cr powders and yttria powders. Besides the dispersoid partitioning, the homogeneity of the mechanically alloyed powder strongly affects the quality. High-quality materials are only produced if the ball milling process yields a homogeneous dispersoid partitioning and a completely mechanically alloyed NiCr20 solid solution.

• Sponsoring Organization: USDOE
• OSTI ID: 260353
• Journal Information: Metallurgical Transactions, A, Journal Name: Metallurgical Transactions, A Journal Issue: 5 Vol. 27; ISSN 0360-2133; ISSN MTTABN
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CHROMIUM ALLOYS
COMPOSITE MATERIALS
DISLOCATIONS
DISPERSION HARDENING
ELONGATION
EXTRUSION
GRAIN BOUNDARIES
GRAIN GROWTH
GRAIN SIZE
MICROHARDNESS
MILLING
NICKEL BASE ALLOYS
PARTICULATES
POWDERS
RECRYSTALLIZATION
SOLID SOLUTIONS
TENSILE PROPERTIES
X-RAY DIFFRACTION
YTTRIUM OXIDES