The microstructure and properties of a powder-processed copper-niobium alloy
High-pressure gas atomization (HPGA) was used to produce rapidly solidified Cu-21.2Nb-1.8Mo (wt%) alloy powders with a range of microstructures found to be dependent on powder size. Specifically, the microstructures of fine-scale powders (<15 {mu}m diameter) were characterized by a predominance of multiphase spheroids and a small population of Nb-based dendrites distributed within an almost pure copper matrix. In contrast, the larger particles (< 45 {mu}m diameter) were found to contain only Nb-based dendrites distributed within a copper matrix. The change in microstructure as a function of powder particle size was analyzed in terms of both the amount of undercooling and the cooling rate of the liquids prior to and during solidification. Yield behavior, flow behavior, parabolic strain hardening, and thermal stability of HPGA materials were determined, and results are discussed briefly.
- Research Organization:
- Pennsylvania State Univ., University Park, PA (United States)
- OSTI ID:
- 5477778
- Resource Relation:
- Other Information: Thesis (Ph.D.)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COPPER BASE ALLOYS
MECHANICAL PROPERTIES
MICROSTRUCTURE
MOLYBDENUM ALLOYS
NIOBIUM ALLOYS
PARTICLE SIZE
POWDER METALLURGY
POWDERS
ALLOYS
COPPER ALLOYS
CRYSTAL STRUCTURE
METALLURGY
SIZE
360103* - Metals & Alloys- Mechanical Properties
360102 - Metals & Alloys- Structure & Phase Studies