摘要
本文研究指出,在标准范围内,2124T851合金厚板的断裂韧性随 Cu、Mg、Fe、Si 含量的增加而明显降低;板材晶粒大小及添加微量硼元素,对断裂韧性无明显影响;而固溶处理是影响断裂韧性的重要因素,但是在185～195℃温度范围内时效9～16小时,对 k_(Ic)值无明显影响。本文通过用2124T851厚板不同类型试样测量了 k_(Ic)值,结果表明:三点弯曲和紧凑拉伸直通缺口的 k_(Ic)值相当,而紧凑型缺口的 k_(Ic)值则偏低约1.5MN/m^(3/2)。
The results in this research indicated that the fracture toughness decreases obviously with the increase of Cu,Mg,Fe and Si contents within chemical com- position range specified in the standard of 2124 T851 aluminium alloy plate, but no obvious influence of grain size in plate and addition of B trace element on fracture toughness was observed.However,solution heat treatment bears an important influence on fracture toughness,the artificial ageing in the range of 185-195℃ for 9-16h has no obvious influence on K_(IC) value of 2124 T851 aluminium alloy plate. For comparison K_(IC) values of various type specimens taken from 2124 T851 plate used for this investigation were measured.The results show that K_(IC) values measured with three-point bend specimens and compact specimens with straight through notch are equivalent,however K_(IC) value of compact specimens with Chev- ron notch is lower 1.5MN/m^(3/2) approximately.
出处
《航空材料学报》
EI
CAS
CSCD
1989年第4期16-23,共8页
Journal of Aeronautical Materials
