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- Title
INFLUÊNCIA DA COMPOSIÇÃO QUÍMICA, POROSIDADE E ENVELHECIMENTO NAS PROPRIEDADES MECÂNICAS DE LIGAS AL-SI-MG FUNDIDAS.
- Authors
Moura Guterres, Albino; de Oliveira, Claudio André Lopes; dos Santos, Carlos Alexandre
- Abstract
The main objective of this work was to analyze the influence of chemical composition, porosity and the effects of heat treatments on some mechanical properties in the Al-Si-Mg as-cast alloys. Two alloys of Al-3,8% Si-0,25% Mg (Alloy I) and Al-6,5% Si-0,6% Mg (Alloy II) were prepared, cast and solidified in metal mold, with without degassing process. Samples were extracted for percentage of porosity analysis and mechanical properties determination. Part of the samples were subjected to precipitation hardening heat treatments. In relation to the porosity, it was observed that the alloy II presented higher percentage of porosity because it contained more Si and Fe in its chemical composition. Regarding mechanical properties analyses, the alloy II presented the best results, resulting in an increase of 25% in the tensile strength and 23% in the hardness when heat treatment was applied. In the analysis of the correlation between chemical composition, percentage of porosity and the effects of the heat treatments with the variation in the mechanical properties, it was developed mathematical models that allow to predict the tensile strength and hardness in these Al-Si-Mg alloys.
- Subjects
HARDENING (Heat treatment); MECHANICAL heat treatment; HEAT treatment; METAL castings; TENSILE strength
- Publication
Tecnologia em Metalurgia, Materiais e Mineração, 2019, Vol 16, Issue 3, p316
- ISSN
2176-1515
- Publication type
Article
- DOI
10.4322/2176-1523.20191697