Microstructure and properties of directionally solidified LaB6 (100)-ZrB2 eutectic composite prepared by the optical zone melting method

Microstructure and properties of directionally solidified LaB6 (100)-ZrB2 eutectic composite prepared by the optical zone melting method
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光学区熔法制备定向凝固LaB6(100)-ZrB2共晶复合材料的组织与性能

DOI:
10.1016/j.jeurceramsoc.2019.01.019
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发表时间:
2019-05
影响因子:
5.7
通讯作者:
Jiuxing Zhang
Jiuxing Zhang
中科院分区:
材料科学1区
文献类型:
--
作者:
Zhenghong Wang;Xinyu Yang;Jingjing Zhao;Zhongwen Zhu;Yan Wang;Jiuxing Zhang

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采用光学区熔技术成功地制备了定向凝固LaB 6(001)-ZrB 2共晶复合材料。系统研究了凝固速度对合金组织和性能的影响,结果表明,随着凝固速度从20 mm/h增加到100 mm/h,合金呈现出均匀的共晶组织。建立了共晶平均间距与凝固速度的关系。断裂韧性表现出明显的各向异性。裂纹偏转和裂纹桥接对提高材料的断裂韧性起着重要作用。随着凝固速度从20 mm/h增加到300 mm/h,断裂韧性、抗弯强度和电流密度先增加后减小。当V = 100 mm/h时,在1873 K下获得了最高的断裂韧性5.16 MPa. m1/2、抗弯强度809.04 MPa和电流密度36.24 A/cm 2。
Directionally solidified (DS) LaB6(001)-ZrB2eutectic composite is successfully prepared by optical zone melting technique. The effect of the solidification rate on the microstructure and properties is systemically investigated.With the increase in the solidification rate from 20 to 100 mm/h, the eutectic rods present a homogeneous eutectic microstructure. The relationship between the average eutectic spacing and the solidification rate is established. The fracture toughness shows an obvious anisotropy. Crack deflection and crack bridging play important roles in improving the fracture toughness of the material. As the solidification rate is increased from 20 to 300 mm/h, the fracture toughness, bending strength and current density firstly increase and then decrease. The highest fracture toughness of 5.16 MPa.m1/2, bending strength of 809.04 MPa and current density of 36.24 A/cm2at 1873 K belong to the DS LaB6(001) - ZrB2eutectic composite obtained at V = 100 mm/h.
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