(中南大學 粉末冶金國家重點實驗室，長沙 410083)
摘 要: 以超細/納米W-7Cu粉末、TiC粉末為原料，采用機械球磨法制備不同含量TiC(0.3%、0.5%、0.7%、1.0% (質量分數(shù)))的W-7Cu復合粉體，經壓制、預燒、燒結，獲得了W-7Cu-nTiC復合材料。研究了TiC添加量對W-7Cu復合材料的顯微組織和力學性能的影響。結果表明：在1300 ℃燒結后，添加不同含量的TiC，使得W-7Cu材料的晶粒大小從5~10 μm細化到2~5 μm；相對密度和抗拉強度也得到提高；在TiC添加量為0.3%時，相對密度從98.22%提高到98.63%，抗拉強度從781 MPa提高到843 MPa；材料的斷裂方式從沿晶斷裂變?yōu)檠鼐嗔押痛┚嗔鸦旌系臄嗔逊绞健Ｕf明TiC的添加，起到良好的細晶強化和彌散強化的作用。
關鍵字: W-Cu復合材料；TiC；彌散強化；細晶強化
（State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract:Ultra-fine/ nano-W-7Cu powders and TiC powders were used as reactors to synthesize W-7Cu composite powder containing TiC (0.3%, 0.5%, 0.7%, 1.0% (mass fraction)) by mechanical milling. Then the productions were pressed, pre-sintered, sintered to synthesize W-7Cu-TiC composites to find the effects of TiC on the microstructure and properties of W-7Cu composites. The results show that the fracture mode of W-7Cu material changes from along the crystal fracture to the mixed fracture mode. And the addition of TiC can refine the grain from 5-10 μm to 2-5 μm after sintered at 1300 ℃. The relative density and tensile strength of W-7Cu materials are increased by the addition of TiC. The tensile strength is promoted from 781 MPa to 843 MPa and the relative density is from 98.22% to 98.63% when the content of TiC is 0.3% after sintered at 1300 ℃. In summary, the addition of TiC can play a good role in grain refinement and dispersion strengthening.
Key words: W-Cu composites; TiC; dispersion strengthening; fine grain strengthening
