摘要
通过TEM及拉伸性能试验研究了较宽的预时效工艺参数（80-200℃,230 min）下,Al-Mg-Si-Cu合金的组织及性能演变规律。研究表明：实验合金在80200℃进行预时效处理,能够抑制自然时效的不利影响。在80℃×（230min）进行预时效后,材料烘烤硬化效应提高有限;在120-160℃预时效5-10 min后,材料的烘烤硬化效应得到较大的提高,且材料烤漆前的屈服强度较低,有利于冲压成形;在更高的温度如200℃进行预时效时,材料烤漆前屈服强度过高,但此时材料的烘烤硬化效应提高尤为显著。T4P下GP区的尺寸对材料烘烤硬化效应的提高至关重要。
Effect of pre-aging process parameters on microstructure and mechanical properties of an Al-Mg-Si-Cu alloy were investigated using TEM and tensile test.The results show that the pre-aging treatments at 80-（200 ℃） can suppress the negative effect of natural aging on subsequent paint-bake cycle.After pre-aging at（80 ℃） for 2-30 min,the improvement of strength for the alloy after paint-bake treatment is not significant.Meanwhile,the alloy pre-aged at 120 to（160 ℃） for 5 to 10 min exhibits a relative low yield strength and good ductility in T4P state,which is favorable for stamping,and after the paint-bake treatments the high strength of the alloy is obtained.The strength of the alloy at T4P and T8X conditions is further increased when it is pre-aged at（200 ℃.） The size of GP zones at T4P condition has a crucial influence on the improvement of paint-bake response of the alloy.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2010年第2期85-89,共5页
Transactions of Materials and Heat Treatment
基金
苏州市科技发展计划基金资助项目(SWH0906)
