Pre-treatment to Improve the Bake-hardening Response in the Naturally Aged Al-Mg-Si Alloy

• Published in: Journal of materials science & technology Vol. 27; no. 3; pp. 205 - 212
• Main Author: Shen, Chin-Hui
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 2011
• Subjects: Natural aging and Bake hardening; Pre-aging; Pre-straining; 前处理方法; 差示扫描量热法; 烘烤条件; 硅合金; 硬化反应; 自然时效; 透射电子显微镜; 铝合金板; Natural aging and Bake hardening; Pre-aging; Pre-straining
• ISSN: 1005-0302; 1941-1162
• DOI: 10.1016/S1005-0302(11)60050-9

This paper describes pre-treatment methods to improve the bake-hardening response of naturally aged AA6022 （Al-0.6Mg-1.0Si）, which is an alloy used in automotive body panels. These methods are used to accelerate the artificial aging process, which proceeds 30-day period of natural aging. The precipitation behavior of the sheets of this aluminum alloy was analyzed by differential scanning calorimetry （DSC） and electrical conductivity measurements, and subsequently confirmed by microstructure observations by transmission electron microscopy （TEM）. Tensile tests and microhardness measurements were performed to determine the mechanical properties of the samples. Under simulated paint-baking conditions （30 min at 170℃）, the microhardness and the yield strength （YS） of the pre-strained ＋ pre-aged samples were found to be I13 HV and 225 MPa, respectively. These values are considerably higher than those of pre-aged samples, and they did not decrease significantly during the initial stage of artificial aging.