Effects of substituting ytterbium for scandium on the microstructure and age-hardening behaviour of Al-Sc alloy

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:601

Article

Tuan, N. Q.¹  Pinto, A. M. P.¹  Puga, H.¹  Rocha, L. A.^1,2  Barbosa, J.¹ 

[1] Univ Minho, Ctr Mech & Mat Technol CT2M, P-4800058 Azurem, Guimaraes, Portugal

[2] Univ Estadual Paulista, UNESP, Fac Ciencias Bauru, BR-17033360 Sao Paulo, SP, Brazil

关键词: Aluminium-scandium alloys;    Ytterbium;    Age-hardening;    Precipitate coarsening;    TEM;    High-resolution TEM;   

DOI  :  10.1016/j.msea.2014.02.042

来源: Elsevier

【 摘 要 】

In order to reduce the cost of Al-Sc alloys and maintain their mechanical properties, the microstructure and mechanical properties of Al-0.24 wt% Sc-0.07 wt% Yb in comparison with Al-0.28 wt% Sc alloys were studied. The aging behaviour, precipitate morphologies, precipitate coarsening and precipitation hardening of both alloys were investigated. The average diameter and the size distribution of nanoscale Al3Sc and Al-3(Sc,Yb) precipitates at various aging conditions were measured. Transmission electron microscopy (TEM) and high-resolution TEM were used to deeply understand the precipitate evolution. A maximum hardness around 73 (HV30) was obtained with a precipitate diameter from 4.3 to 5.6 nm for both alloys. (c) 2014 Elsevier B.V. All rights reserved.

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