Mechanical Properties of LaB6-ZrB2 Composites

Guang Hui Min; Ruilan Gao; Hua Shun Yu; Jiande Han

doi:10.4028/www.scientific.net/KEM.297-300.1630

Paper Titles

Effect of Stress State on Mode II Stable Crack Extension
p.1604

Effect of Mode Mixty on Interfacial Fracture Toughness of Si/Organic Polymer
p.1611

Numerical Approach to Fracture of Glass under Biaxial Stress
p.1617

Behavior of Fatigue Crack around a Hole under Biaxial Loading: Effect of Biaxial Static Load
p.1623

Mechanical Properties of LaB₆-ZrB₂ Composites
p.1630

Vibration Characteristics of the FIV Test Loop
p.1639

Evaluation of Nuclear Piping Failure Frequency in Korean Pressurized Water Reactors
p.1645

Bottom-Mounted Nozzle Failure Modes of a Nuclear Reactor Pressure Vessel under Severe Accident Conditions
p.1652

Alternative Fatigue Evaluation of Nuclear Piping Designed by ANSI B31.1 Code
p.1659

HomeKey Engineering MaterialsKey Engineering Materials Vols. 297-300Mechanical Properties of LaB6-ZrB2 Composites

Mechanical Properties of LaB₆-ZrB₂ Composites

Abstract:

The polycrystallined LaB6-ZrB2 composites with different content of ZrB2 were fabricated by vacuum hot-pressed sintering technique in this paper. The effects of ZrB2 content on the microstructure and mechanical properties were investigated. For the eutectic LaB6-ZrB2 (21wt%) composite, the hardness, flexural strength and fracture toughness is of 93.0 (HRA), 330.0MPa and 3.70MPa·m1/2, respectively. The results showed the hardness and flexural strength of LaB6-ZrB2 polycrystalline have been enhanced with the increasing of ZrB2 content, but the fracture toughness increases first then arrives at peak value, which is corresponding to the ZrB2 content of 21wt%. The microstructure observation revealed an improved densification due to addition of ZrB2. The fracture morphology showed a tendency of the fracturing from intergranular to transgranular manner with increasing the ZrB2 content. The fracture behavior of the composites was analyzed in the paper