Interconnection of Zn content, macrosegregation, dendritic growth, nature of intermetallics and hardness in directionally solidified Mg-Zn alloys

Autor(es)

Verissimo, Nathalia C. ^[1] ; Brito, Crystopher ^[1] ; Santos, Washington L. R. ^[1] ; Cheung, Noe ^[1] ; Spinelli, Jose E. ^[2] ; Garcia, Amauri ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, UNICAMP, Dept Mfg & Mat Engn, BR-13083E86 Campinas, SP - Brazil

^[2] Fed Univ Sao Carlos UFSCar, Dept Mat Engn, BR-13565905 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Alloys and Compounds; v. 662, p. 1-10, MAR 25 2016.
• Citações Web of Science: 16

Resumo

Mg and Mg-based alloys are lightweight metallic materials that are extremely biocompatible and have promising mechanical properties. Mg-Zn alloys have potential applications as biomaterials in the field of hard tissue engineering for load bearing applications, and are mainly produced by casting with limited further operations such as finishing by thermo-mechanical and machining of the surface. Thus, understanding the solidification behaviour of Mg-Zn alloys becomes an essential task to be accomplished. The aim of this work is to examine the interconnection of alloy Zn content/macrosegregation/scale of the dendritic microstructure/nature of intermetallics and hardness of samples obtained by transient directional solidification of four Mg-Zn alloys. Experimental growth laws relating the primary dendrite arm spacing, lambda(1), of directionally solidified samples to solidification thermal parameters such as the growth rate and the cooling rate are proposed. The experimental scatters of lambda(1) are shown to be mainly inside the range of theoretical lambda(1) values predicted by the Hunt-Lu model. Also, the combined effects of macro-segregation, Zn alloying and lambda(1) on hardness of Mg-Zn alloys are evaluated and functional equations relating lambda(1) to hardness are proposed. (C) 2015 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 12/08494-0 - Parâmetros Térmicos e Microestruturais na Solidificação Transitória de Ligas Al-Mg e Al-Mg-Si e Correlação com Resistências Mecânica e à Corrosão
• Beneficiário: Crystopher Cardoso de Brito
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 14/50502-5 - Interrelation of thermal and microstructural solidification parameters and corrosion/tribocorrosion behavior of alloys for tribological, biomedical and solder applications
• Beneficiário: Amauri Garcia
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 13/23396-7 - Efeitos de parâmetros da microestrutura de solidificação de ligas multicomponentes à base de alumínio (Al-Mg-Si; Al-Sn-Cu; Al-Zn-Mg) nas resistências à degradação por corrosão e tribocorrosão
• Beneficiário: Amauri Garcia
• Modalidade de apoio: Auxílio à Pesquisa - Regular