【作者】 翁永刚； 王明星； 刘志勇； 宋天福；

【Author】 WENG Yonggang, WANG Mingxing, LIU Zhiyong, SONG TianfuMaterials Physics Lab, Zhengzhou University, Zhengzhou 450052, China

【机构】 郑州大学物理工程学院材料物理实验室；

【摘要】 以电解铝硅钛合金为基,熔配成符合国家标准牌号ZL101A成分的铝合金AST101。用柔度法测量了该合金的断裂韧度K_1C,并与同等条件下制备的ZL10lA试样测量值作了对比分析。在预制疲劳裂纹过程中,用自制的显微镜在线监测系统测量了疲劳裂纹扩展长度,按最小二乘法拟合了柔度法计算公式中的系数,并与原公式计算结果作了比较。结果表明:（1）AST101合金的断裂韧度K_1C=（462.1±20.3）N/mm^3/2,高于ZL10lA合金的断裂韧度K_1C=（376.7±15.5）N/mm^3/2,电解中进入AST101合金中的钛元素有利于提高断裂韧性;（2）平面应变条件下,柔度法计算的裂纹长度与显微镜在线测量值之间的差别对断裂韧度K_1C的计算结果影响不大,可适当修正以提高测试精度。更多还原

【Abstract】 The electrolyzed Al-Si-Ti alloy used as basic alloy was melted and mixed with other components to form a new aluminum alloy AST 101, whose chemical components conform to the national standard of ZL101 A. Its fracture toughness KIC has been tested by the compliance method, and is compared with the tested results of ZL101A specimen made under the same condition. During precracking, the fatigue crack lengths were measured by the self-designed microscopic monitoring system online, and the measured data were fitted using LSF method to obtain the coefficients of the compliance formula. The results were compared with the ones calculated in the former compliance formula. It is shown that: (1) the fracture toughness of AST101 alloy, which is KIC=(462.1±20.3) N/mm3/2, is superior to that of ZL101A alloy, which is KIC=(376.7±15.5) N/mm3/2. The titanium element entered AST101 alloy during electrolyzing process is believed to be in favor of improving the fracture toughness of aluminum alloy; (2) In the condition of plain strain, the difference between the crack lengths calculated by the compliance method and that measured by the microscopic monitoring system online has little influence on the calculated fracture toughness KIC , and the results can be revised properly to increase precision.更多还原