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采用单边缺口三点弯曲试样测定了Al-Li-Cu-Mg-Zr合金的断裂韧性,还测量了拉伸性能和硬度。着重分析了裂纹形态和断口形貌,讨论了裂纹偏斜和分叉对裂纹尖端的屏蔽作用,分别计算了本征的和非本征的断裂韧性值。
The fracture toughness of Al-Li-Cu-Mg-Zr alloy was measured by unilateral notched three-point bending test. Tensile properties and hardness were also measured. The crack morphology and fracture morphology are analyzed. The shielding effect of crack skew and bifurcation on the crack tip is discussed. The intrinsic and extrinsic fracture toughness values are calculated respectively.