Effect of stabilizing annealing on microstructure and properties of a new 5 ××× aluminum alloy
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采用扫描电镜、电子背散射衍射、透射电镜、晶间腐蚀质量损失测试和室温拉伸性能测试等手段,研究了稳定化退火温度和时间对新型5×××铝合金组织与性能的影响规律.结果表明,随着稳定化退火温度的升高,5 ×××铝合金静态再结晶过程趋于完全,{ 001}<100>织构组分逐渐占据主导地位.不同稳定化退火处理对铝合金的室温拉伸性能无显著影响.当稳定化退火温度为200～260℃时,保温20 min就会加速β相在晶界上的沉淀和球化,连续分布的网状析出相会严重恶化合金的耐晶间腐蚀性能;当稳定化退火温度为270～300℃时,保温10～60 min后,合金晶间腐蚀产生的质量损失满足标准ASTM G67中小于15 mg/cm2的要求.因此,最佳稳定化退火工艺参数为:保温温度270～300 ℃,保温时间10～60 min.
Effect of stabilizing annealing temperature and time on microstructure and properties of a new 5 × × × aluminum alloy was investigated by means of SEM,EBSD,TEM,intergranular corrosion mass loss test and tensile properties test.The results show that the static recrystallization of the 5 ××× aluminum alloy is gradually completed with the increase of stabilizing annealing temperature,showing a dominant role of { 001 }<100>texture component.The various stabilizing annealing treatments have no significant effect on the tensile properties of the aluminum alloy at room temperature.When the annealing temperature is located within the range of 200-260 ℃,the precipitation and spheroidization of β phase on the grain boundary can be accelerated after holding for 20 min.The continuous distribution of precipitation network seriously deteriorates the intergranular corrosion resistance of the aluminum alloy.In contrast,the mass loss of intergranular corrosion can meet the ASTM G67 requirement of less than 15 mg/cm2 when the stablizing annealing treatment is performed at 270-300 ℃ for 10-60 min.Thus,the optimum stabilization treatment for the aluminum alloy is annealing at 270-300 ℃ and holding for 10-60 min.
5 ××× aluminum alloystabilization treatmentprecipitationintergranular corrosionmicrostructure and properties
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