采用高能球磨及低压烧结方法,制备了超细晶WC-Ni_3Al硬质合金。通过X射线衍射、扫描电镜、力学性能及腐蚀性能测试,研究了Ni_3Al含量对超细晶WC-Ni_3Al的硬质合金的组织与性能影响。结果表明:随Ni_3Al含量的增加,合金的硬度和抗压缩强度逐渐下降,合金的断裂韧性明显增加,而其抗腐蚀性能则明显下降。 Ultrafine grained WC-Ni_3Al cemented carbide was prepared by high energy ball milling and low pressure sintering. The effect of Ni_3Al content on microstructure and properties of ultrafine WC-Ni_3Al cemented carbide was studied by X-ray diffraction, scanning electron microscopy, mechanical properties and corrosion resistance. The results show that with the increase of Ni_3Al content, the hardness and compressive strength of the alloy gradually decrease, the fracture toughness of the alloy increases obviously, and the corrosion resistance decreases obviously.