摘要
研究了不同Ｃｅ含量的１４２０合金在１２０℃，３０ｈ及１７０℃，６ｈ时效条件下的断裂性能。结果表明：微量Ｃｅ在这两种时效条件下可在一定程度上降低１４２０合金薄板的裂纹扩展阻力、启裂抗力及平面应力断裂韧性，减少二次裂纹，使沿晶分层现象不明显。Ｃｅ在１４２０合金中对断裂性能不能产生有利作用的原因，可认为是Ｃｅ微合金化能够降低１４２０合金的外韧化水平所致。
The fracture behavior has been investigated for alloy 1420 sheets contained various Ce contents under the conditions of aging for 30h at 120℃ and for 6h at 170℃. The results indicate that adding minor Ce into alloy 1420 could decrease the crack propagation resistance, starting fracture resistance and plane stress fracture toughness to a certain degree. The secondary cracks can be also reduced and the crack-dividing delamination becomes insignificant because of Ce microalloying. The reason why Ce microalloying could not be of benefit to the fracture toughness of alloy 1420 sheets might be supposed to be that the level of extrinsic toughness of the alloy is reduced by adding Ce element.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
1997年第2期45-49,共5页
Rare Metal Materials and Engineering
关键词
铝锂合金
合金化
断裂特性
铈
Al-Li based alloy,Ce addition,microalloying,fracture characteristic
