Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第30卷    第6期    总第255期    2020年6月

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文章编号:1004-0609(2020)-06-1281-08
TiC对W-7Cu复合材料组织与性能的影响
高 银,刘 涛,韩 勇,范景莲,王圆圆,雷 挺

(中南大学 粉末冶金国家重点实验室,长沙 410083)

摘 要: 以超细/纳米W-7Cu粉末、TiC粉末为原料,采用机械球磨法制备不同含量TiC(0.3%、0.5%、0.7%、1.0% (质量分数))的W-7Cu复合粉体,经压制、预烧、烧结,获得了W-7Cu-nTiC复合材料。研究了TiC添加量对W-7Cu复合材料的显微组织和力学性能的影响。结果表明:在1300 ℃烧结后,添加不同含量的TiC,使得W-7Cu材料的晶粒大小从5~10 μm细化到2~5 μm;相对密度和抗拉强度也得到提高;在TiC添加量为0.3%时,相对密度从98.22%提高到98.63%,抗拉强度从781 MPa提高到843 MPa;材料的断裂方式从沿晶断裂变为沿晶断裂和穿晶断裂混合的断裂方式。说明TiC的添加,起到良好的细晶强化和弥散强化的作用。

 

关键字: W-Cu复合材料;TiC;弥散强化;细晶强化

Effects of TiC on microstructure and properties of W-Cu composites
GAO Yin, LIU Tao, HAN Yong, FAN Jing-lian, WANG Yuan-yuan, LEI Ting

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

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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