摘要
为研究不同时效制度对7B04铝合金断裂韧性的影响,测定了15种时效工艺的常规力学性能和断裂韧度,并利用扫描电镜对拉伸断口进行分析.通过比较不同时效工艺制度的性能指标和断口形貌,总结出时效制度对7B04铝合金断裂韧度的影响规律.结果表明:随着第二级时效温度的提高和时效时间的延长,7B04铝合金强度下降,断裂韧性提高,其中,温度对性能的影响更大;采用115℃×7 h+185℃×13 h双级时效工艺时,对应的强度和断裂韧度指标均比T73和T76工艺对应的指标高.
In this article, the influence of aging process on fracture toughness is studied. The tensile performance and the fracture toughness of 7B04 aluminium alloy have been determined, and the fracture of tensile sample is scanned. According to the results, it shows that the strength decreases and the fracture toughness increases with the increase of the second aging temperature and the increase of the second aging time and the temperature is more effective. The 115℃ ×7 h ＋ 185 ℃× 13 h aging process has higher strength and fracture toughness than T76 and T73.
出处
《材料科学与工艺》
EI
CAS
CSCD
北大核心
2006年第3期240-243,共4页
Materials Science and Technology
关键词
7B04铝合金
时效
断裂韧性
强度
7B04 aluminium alloy
ageing
fracture toughness
strength
