摘要
采用硬度、电导率、拉伸性能、撕裂性能等性能测试和差示扫描量热(DSC)、透射电镜(TEM)等分析方法研究单级时效和多级断续时效对高Cu/Mg比Al-Cu-Mg-Ag-Zr合金组织和性能的影响。结果表明:与T6态合金相比,多级断续时效处理在保持合金强度、硬度和电导率同时,显著提高合金的断裂韧性;160℃单级时效过程中,-和θ′相同时析出;断续时效第一级和第三级时效的主要析出相与单级时效的类似,第二级低温时效过程中,θ′相明显析出,未出现明显的-相析出特征。
Hardness,electrical conductivity,tensile,tear test and differential scanning calorimetry（DSC）,transmission electron microscopy were used to investigate the effect of single ageing and multi-step ageing process on the microstructure and properties of an Al-Cu-Mg-Ag-Zr alloy with high Cu/Mg ratio.The results show that comparing with the alloy at T6 condition,the hardness,strength and electrical conductivity of the alloy after multi-step ageing keeps unvaried,while the fracture toughness increases significantly.In the single ageing process,Ω and θ′ phases separate out simultaneously.At the first and third step of multi-step ageing,the characteristic of precipitates is not different from that of single ageing.But,θ′ phase separates out without significant characteristic of Ω phase at the second step of low temperature ageing.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2011年第6期1235-1243,共9页
The Chinese Journal of Nonferrous Metals
基金
国家自然科学基金资助项目(51004018)
关键词
铝合金
多级断续时效
断裂韧性
析出相
aluminum alloys
multi-step ageing
fracture toughness
precipitates
