材料科学
断裂韧性
微晶
缩进
抗弯强度
维氏硬度试验
复合材料
电阻率和电导率
热压
断裂(地质)
微观结构
冶金
电气工程
工程类
作者
Ning Li,Yinjuan Bai,Shuai Wang,Yongting Zheng,Fanyu Kong,Xudong Qi,Rongguo Wang,Xiaodong He,Andrew Ian Duff
摘要
Abstract Polycrystalline Fe 2 AlB 2 bulk including minor Al 2 O 3 is synthesized by reactive hot pressing from Fe, Al, and B powders at 1200°C and 30 MPa for 30 minutes, with a relative density of 96%. The present approach enables a markedly reduced holding time compared with previous studies. The derived Fe 2 AlB 2 shows an electrical resistivity of 2.27±0.01 μΩ·m, Vickers hardness of 10.2±0.2 GPa, flexural strength of 232±25 MPa, compressive strength of 2101±202 MPa, fracture toughness of 5.4±0.2 MPa·m 1/2 and work of fracture of 117±12 J/m 2 . No dominant indentation cracks are observed, indicating that Fe 2 AlB 2 may be quite damage tolerant. Interestingly, a noncatastrophic failure is present in the SENB test, with a high work of fracture. The energy‐absorbing mechanisms in inhibiting crack formation are delamination and pullout of Fe 2 AlB 2 grains.
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