摘要
采用三点弯曲法测试了2124铝合金的断裂韧性,并用扫描电子显微镜对试样断口纵剖面的组织形貌进行了观察.试验结果表明,2124铝合金的断裂韧性比国际标准略低,试样断口有明显的解理断裂特征,微坑较多,气孔、疏松、夹杂物以及第二相质点明显,裂纹源主要是θ相、夹杂物以及疏松,S相对材料的断裂韧性没有影响.
The fracture toughness of 2124 Al-alloy was determined by three-point bending test method, the fractograph of the fracture profile was observed by the use of scanning electron microscope. The results show that the fracture toughness value of 2124 Al-alloy is slightly low compared with those of the similar international products. The fracture surface showed obvious cleavage fracture characteristics with many micro-holes, gas-pocket, inclusions and the second phase particles. The crack initiated primarily from thephase, inclusions and loose holes,while the S-phase has no influence on the fracture toughness.
出处
《材料研究与应用》
CAS
2008年第1期39-42,共4页
Materials Research and Application
关键词
三点弯曲法
断裂韧性
组织
解理
three-point bending
fracture toughness
structure
cleavage
