High-strength powder metallurgy aluminum alloys in glass-forming Al-Ni-Ce-(Ti or Zr) systems

Journal Article · Thu Jul 15 00:00:00 EDT 1993 · Scripta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-716X(93)90322-J· OSTI ID:6404837

Kawamura, Y; Inoue, A; Sasamori, K; Masumoto, T ^[1]

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1. Tohoku Univ., Sendai (Japan)

Powder metallurgy (P/M) aluminum alloys with high mechanical strengths have been developed by taking advantage of rapid solidification (RS). The improved strengths result from structural modifications such as reduction of segregation, refinement of grain size and increase in solid solubility limit which mainly depend on the amount of undercooling of melt. To produce crystalline alloys with a refined structure, few approaches are considered: the crystallization of an amorphous alloy, the control of cooling rate from melt and the selection of optimum composition for glass-forming alloys. However, these methods are generally attended with a disadvantage for embrittlement. Recently, it has been found that Al-based amorphous alloys exhibiting high tensile strength and good bending ductility form by liquid quenching in the Al-Ln-TM (Ln: lanthanide metal, TM: transition metal) system. Furthermore, the consolidation of the amorphous alloy powders to a bulk amorphous alloy has also been achieved by warm extrusion. The first aim of this paper is to examine the effect of alloy composition on the strength and ductility of crystalline compacts produced by extrusion of rapidly solidified powders in the Al-Ni-Ce-TM(TM:Ti, Mn, Fe, Co, Cu, Zr) systems where an amorphous phase is formed by melt spinning. The second is to investigate whether or not the structural refinement by using glass-forming alloys is useful to develop high-strength P/M aluminum alloys.

• OSTI ID: 6404837
• Journal Information: Scripta Metallurgica et Materialia; (United States), Vol. 29:2; ISSN 0956-716X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
MECHANICAL PROPERTIES
MICROSTRUCTURE
CERIUM ALLOYS
NICKEL ALLOYS
TITANIUM ALLOYS
ZIRCONIUM ALLOYS
AMORPHOUS STATE
CHEMICAL COMPOSITION
DUCTILITY
EXPERIMENTAL DATA
EXTRUSION
POWDER METALLURGY
POWDERS
QUATERNARY ALLOY SYSTEMS
SOLIDIFICATION
ALLOY SYSTEMS
ALLOYS
CRYSTAL STRUCTURE
DATA
FABRICATION
INFORMATION
MATERIALS WORKING
METALLURGY
NUMERICAL DATA
PHASE TRANSFORMATIONS
RARE EARTH ALLOYS
TENSILE PROPERTIES
360103* - Metals & Alloys- Mechanical Properties
360102 - Metals & Alloys- Structure & Phase Studies