摘要
通过力学性能的检测、扫描电镜和透射电镜的观察 ,研究了不同固溶制度、不同变形系数对高纯高强铝合金组织和性能的影响。结果表明 ,尽可能地提高固溶温度、延长固溶时间和采用较大的变形程度 ,可以提高残余可溶结晶相的固溶程度和合金的力学性能 ;合金的断裂属晶内韧窝与沿晶的混合型断裂 ;合金的KIc主要受δ值的影响并与δ值有相似的变化趋势 ;在同样的固溶制度下 ,当合金的变形系数为 1 2 5时其性能高于变形系数为6 5的场合 ;合金的最佳固溶制度为 4 85℃× 4 0 0min。在此制度下 ,合金的σb、σ0 .2 、δ和KIc分别为 6 46 7MPa、6 0 1 2MPa、1 2 %和 36 7MPa·m1/2 。
The effect of different solution treatments and different deformation coefficients on the microstructure and mechanical properties of the high-purity and high-strength aluminum alloy was investigated by means of mechanical properties test,OM,SEM and TEM analysis.The results show that the mechanical properties of high-purity and high-strength aluminum alloy are improved when the solution treatment temperature increases as high as possible and solution time is prolonged as far as possible;the variety of .K._(Ic) of the alloy resembles the variety of .δ. of the alloy;the fracture of the alloy belongs to the transgranular/intergranular mixed mode.The properties of the alloy with deformation coefficient 12.5 are higher than those of the alloy with deformation coefficient 6.5 when the solution treatment is the same.The best parameter of solution treatment for the alloy is 485℃×400min and .σ._b,.σ._(0.2),.δ. and .K._(Ic) of the alloy are 646.7MPa,601.2MPa,12% and 36.7MPa·m^(1/2) respectively,the values of the mechanical properties of the alloy are higher than ones of similar materials in the world.
出处
《金属热处理》
CAS
CSCD
北大核心
2004年第4期13-17,共5页
Heat Treatment of Metals
基金
重庆市院士基金项目 ( 2 0 0 0 62 85 )
湖南省教育厅项目 ( 0 3C44 4)
关键词
高纯高强铝合金
固溶处理
组织
性能
high-purity and high-strength aluminum alloy
solution treatment
microstructure
properties
