Publication Date

8-1-2017

Department

Ames Laboratory

Campus Units

Ames Laboratory

Report Number

IS-J 9497

DOI

10.1039/C7MH00391A

Journal Title

Materials Horizons

Volume Number

4

First Page

1070

Last Page

1078

Abstract

Light-weight high-temperature alloys are important to the transportation industry where weight, cost, and operating temperature are major factors in the design of energy efficient vehicles. Aluminum alloys fill this gap economically but lack high-temperature mechanical performance. Alloying aluminum with cerium creates a highly castable alloy, compatible with traditional aluminum alloy additions, that exhibits dramatically improved high-temperature performance. These compositions display a room temperature ultimate tensile strength of 400 MPa and yield strength of 320 MPa, with 80% mechanical property retention at 240 °C. A mechanism is identified that addresses the mechanical property stability of the Al-alloys to at least 300 °C and their microstructural stability to above 500 °C which may enable applications without the need for heat treatment. Finally, neutron diffraction under load provides insight into the unusual mechanisms driving the mechanical strength.

Language

en

Department of Energy Subject Categories

36 MATERIALS SCIENCE

Publisher

Iowa State University Digital Repository, Ames IA (United States)

IS-J 9497 supplemental Information.pdf (1148 kB)
Supplementary Information

Included in

Metallurgy Commons

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