摘要
研究了预时效工艺对汽车车身用Al-Mg-Si-Cu铝合金板材组织及性能的影响。结果表明,合金板材固溶水淬后进行合适的预时效处理,能够显著降低自然时效的有害作用,合金板材的成形性能及烘烤硬化能力显著提高。预时效处理后,形成的原子团簇(或GP区)尺寸明显大于自然时效形成的原子团簇(或GP区),能够作为合金主要强化相β″的形核核心,有效促进烘烤条件下β″相的析出,从而显著提高板材烤漆硬化能力。合金板材经150℃/5 min预时效后,能够获得成形性能和烘烤硬化能力的良好组合。
The effect of pre-ageing on the microstructure and properties of Al-Mg-Si-Cu alloy used for automotive body sheets was investigated. The results show that the pre-ageing treatments after solution and water quenching can effectively decrease the detrimental effect of natural ageing,and the formability and paint-bake response of the pre-aged alloy sheet are improved dramatically. The size of the clusters（ or GP zones） formed during pre-aging treatment is larger than that formed during the natural ageing,and which can act as the nucleus of the main strengthening β″ phase, and effectively promote β″ phase precipitation under paint-baking conditions, then significantly improve the paint-bake response of the pre-ageing alloy sheet. After 150 ℃ /5 min pre-aging treatment,the studied alloy sheet can obtain good combination of the formability and paint-bake response.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2015年第7期88-93,共6页
Transactions of Materials and Heat Treatment
