Effect of Particle Size on Microstructure and Mechanical Properties of Porous NiTi Alloys Prepared by Microwave Sintering [颗粒尺寸对微波烧结多孔NiTi合金的显微结构及力学性能的影响]

作者：Xu J.^*; Tao S.; Jin X.; Luo J.; Liu Y.

来源：Rare Metal Materials and Engineering, 2020, 49(2): 454-460.

• Mechanical property
• Microstructure
• Microwave sintering
• Particle size
• Porous NiTi alloy

The porous NiTi alloys were prepared by microwave sintering from Ni/Ti powder with different particle sizes, and the effect of particle size on the microstructure and mechanical properties of the porous NiTi alloys was systematically investigated. The results show that the undesired Ti2Ni and Ni3Ti phases in the porous NiTi alloys decrease and the Ni phase disappears with decreasing the particle sizes. At the same time, the pore shapes of the porous NiTi alloys change from the irregular shape with sharp angles to the suborbicular shape. Moreover, both of the porosities and pore sizes of the porous NiTi alloys increase with increasing the particle sizes, while all of the Rockwell hardness, compressive strength and bending strength decrease. Therefore, the decrease of particle sizes is beneficial to obtain the microwave sintered porous NiTi alloys with desired microstructure (pure phase composition and uniform pore structure) and high mechanical properties.

• 单位
  南昌航空大学