Development of alloys with high strength at elevated temperatures by tuning the bimodal microstructure in the Al–Cu–Ni eutectic system

The development of high-strength aluminum alloys that can operate at 250°C and beyond remains a challenge to the materials community. In this paper we report preliminary development of nanostructural Al–Cu–Ni ternary alloys containing α-Al, binary Al2Cu and ternary Al7Cu4Ni intermetallics. The alloy...

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Bibliographic Details
Published in:Scripta materialia 2014-12, Vol.93, p.20-23
Main Authors: Tiwary, C.S., Kashyap, S., Chattopadhyay, K.
Format: Article
Language:English
Subjects:
Alloys
ALUMINUM ALLOYS (50 TO 99 AL)
Aluminum base alloys
Bimodal length scale
Communities
COPPER ALUMINUM ALLOYS
Ductility
ELEVATED TEMPERATURE
Eutectic alloy
Fracture mechanics
Fracture strength
High strength
INTERMETALLIC COMPOUNDS
MECHANICAL PROPERTIES
Microstructure
MICROSTRUCTURES
PHASE DIAGRAMS
Strength
Tuning
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Summary:The development of high-strength aluminum alloys that can operate at 250°C and beyond remains a challenge to the materials community. In this paper we report preliminary development of nanostructural Al–Cu–Ni ternary alloys containing α-Al, binary Al2Cu and ternary Al7Cu4Ni intermetallics. The alloys exhibits fracture strength of ∼1GPa with ∼9% fracture strain at room temperature. At 300°C, the alloy retains the high strength. The reasons for such significant mechanical properties are rationalized by unraveling the roles and response of various microstructural features.
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2014.08.020