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Journal of Materials Engineering and Performance

Erschienen in:

03.04.2019

The Effects of Sc Addition on the Microstructure and Mechanical Properties of Be-Al Alloy Fabricated by Induction Melting

verfasst von: Liangbo Yu, Wenyuan Wang, Jing Wang, Bin Su, Xianfeng Dong, Zhenhong Wang

Erschienen in: Journal of Materials Engineering and Performance | Ausgabe 4/2019

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Abstract

This study investigated the alloying effects of 0.4 wt.% Sc on the microstructure, mechanical properties, and fracture behavior of a cast Be-Al alloy prepared by vacuum induction melting. The micromechanics of Sc-containing secondary-phase particles (SPs) were characterized by nanoindentation, and the fracture behavior of the alloy was investigated via tensile fractography and optical metallography. The addition of 0.4 wt.% Sc significantly modified the alloy microstructure by decreasing the secondary dendritic arm spacing (SDAS), weakening the dendritic structure of Be, and producing an equiaxed/cellular alloy microstructure with refined Be grains. Sc alloying increased the Vickers hardness by 36%, elastic modulus by 28%, yield strength by 35%, ultimate strength by 52%, but decreased the elongation from 3.6 to 2.9%. Sc-containing SPs had a higher elastic modulus, yield strength, microhardness, and a lower plasticity index than the Be and Al matrices, resulting in interface separation during the fracture process. SPs located at the Be/Al interfaces did not act as microcrack sources for the matrices, whereas highly faceted SPs within the Be grains induced microcrack formation and decreased the elongation. The failure mode of the cast Be-Al-0.4Sc alloy still involved the brittle cleavage failure of Be regions and ductile dimple failure of Al regions, which was not the case with the cast Be-Al alloy.

Vorheriger Artikel Surface Structure and Corrosion Behavior of Mg68−xZn28+xCa4(x = 0.4) Bulk Metallic Glasses after Immersion in Ringer’s Solution

Nächster Artikel Microstructure and Mechanical Properties of a Multiphase FeCrCuMnNi High-Entropy Alloy

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Titel: The Effects of Sc Addition on the Microstructure and Mechanical Properties of Be-Al Alloy Fabricated by Induction Melting
verfasst von: Liangbo Yu
Wenyuan Wang
Jing Wang
Bin Su
Xianfeng Dong
Zhenhong Wang
Publikationsdatum: 03.04.2019
Verlag: Springer US
Erschienen in: Journal of Materials Engineering and Performance / Ausgabe 4/2019
Print ISSN: 1059-9495
Elektronische ISSN: 1544-1024
DOI: https://doi.org/10.1007/s11665-019-04004-3

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