摘要
采用 (Vickers)压痕试验法来测试评估准晶Al59Cu2 5.5Fe12 .5B3 的断裂韧性。根据维氏压痕的断面轮廓、径向裂纹尺寸和相关的计算表达式 ,测试了显微硬度Hv和裂纹萌生的临界载荷值 ,评估了该准晶材料的杨氏弹性模量E和断裂韧性。结果表明 :该准晶材料的杨氏模量为 1 0 8.5GPa,断裂韧性约 1 .3 4MPa·m- 1/2 。对于维氏压头而言 ,裂纹萌生的临界载荷值在 2 5 0mN～ 5 0 0mN的范围。此外 ,运用原子力显微镜 (AFM)和扫描电子显微镜 (SEM)观察了裂纹萌生和裂纹扩展的表面形貌。
Vickers indentation test was used to evaluate the fracture toughness for Al 59 Cu 25.5 Fe 12.5 B 3 quasicrystals.According to the profiles of the indentation,radial crack size and related equations,the microhardness Hv,Young's modulus E,cracking threshold,and fracture toughness hade been evaluated.The results showed that the Young's modulus of Al_Cu_Fe_B quasicrystal was evaluated as 108.5 GPa,and the fracture toughness was about 1.34 MPa·m -1/2 .For the Vickers indenter,the cracking threshold was presented in the range of 250 mN～500 mN.Moreover,the surface morphology of the indentations and the cracks were observed by means of Atomic Force Microscopy (AFM)and Scanning Electron Microscopy (SEM).
出处
《江西科学》
2001年第3期134-137,共4页
Jiangxi Science
关键词
准晶
断裂韧性
裂纹
维氏硬度
Quasicrystal,Fracture toughness,Cracks,Vicker hardness
