Effect of SPS Cyclic Heat-Treatment on the Microstructure and Properties of 93W-4.9Ni-2.1Fe Alloy [SPS循环热处理对93W-4.9Ni-2.1Fe合金组织和性能的影响]

作者：Guan M.; Li X.^*; Hu K.; Yang F.; Zhu D.

来源：Rare Metal Materials and Engineering, 2018, 47(7): 2210-2215.

• 93W-4.9Ni-2.1Fe
• Bending strength
• Cyclic heat-treatment
• Spark plasma sintering

The effect of vacuum cyclic heat-treatment based on spark plasma sintering (SPS) technique on the microstructure, composition and properties of as-sintered 93W-4.9Ni-2.1Fe tungsten heavy alloy was studied by optical microscope, SEM, EDS and three-point bending tests. The results show that the matrix penetration into W-W grain boundaries increases in amount remarkably, and the W-W contiguity and dihedral angle decrease gradually with the increase of the cycle index. SPS cyclic heat-treatment does not obviously change the micro-hardness and grain size. The matrix is strengthened by the increase of tungsten content owing to the treatment. The bending strength of the alloy is significantly increased after 2 cycles. When the number of cycles is increased to 20, the average bending strength reaches 2321 MPa, which is 160 MPa higher than that of the conventional liquid-sintered and solution-treated 93W-4.9Ni-2.1Fe alloy. The microstructure and properties of 93W-4.9Ni-2.1Fe tungsten heavy alloy can be improved greatly by SPS cyclic heat-treatment.

• 单位
  华南理工大学