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ZrC含量對鎢材料組織和性能的影響
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中南大學(xué)粉末冶金研究院,中南大學(xué)粉末冶金研究院

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中圖分類號:

TG146.4 11；TF124.5 2

基金項目:

國家教育部博士點基金;國家重點基礎(chǔ)研究發(fā)展計劃（973計劃）


Effect of ZrC content on Microstructure and properties of tungsten materials
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Affiliation:

Powder Metallurgy Research Institute, Central South University,Powder Metallurgy Research Institute, Central South University

Fund Project:

National Natural Science Foundation of China (21077041); Science Foundation of Jilin Province of China (201205067)

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    摘要:

    采用“溶膠-非均相沉淀-噴霧干燥-熱還原”制備了W-ZrC復(fù)合粉末，經(jīng)氫氣保護氣氛高溫?zé)Y(jié)后制備出W-ZrC材料，研究了ZrC含量對W的力學(xué)性能和顯微組織的影響。結(jié)果表明，W-ZrC材料的相對密度較純W材料得到很大提高，其室溫拉伸強度由粉末燒結(jié)態(tài)純W的290MPa可提高至543MPa，材料的應(yīng)變由1.7%增大至3.5%；ZrC第二相粒子作為障礙能有效阻礙鎢晶界的移動，由純W晶粒的100μm左右細(xì)化至10-15μm；純W的斷口形貌主要為沿晶解理斷裂，添加ZrC第二相粒子后斷口組織中出現(xiàn)了穿晶解理斷裂，說明ZrC能夠有效強化W的晶界強度，并起到良好的細(xì)晶強化和彌散強化作用。

    Abstract:

    W-ZrC composite powders were prepared by sol-heterogeneous precipitation-spray drying thermal reduction technology. W-ZrC material was prepared by high temperature sintering under hydrogen atmosphere. Effect of ZrC content on the microstructure and properties were investigated. The results show that the relative density of W-ZrC material is greatly improved compared with that of pure W, the room temperature tensile strength of W-ZrC material is twofold of pure W , which is 290MPa. And the strain of the material is increased from 1.7% to3.5%. The second phase particles of ZrC can effectively prevent the migration of grain boundary. The grain is refined from 100μm to 10-15μm. The fracture morphology of pure W is mainly intergranular fracture, but W-ZrC materials is visible in transgranular brittle fracture. ZrC can effectively enhance the strength of the grain boundary of W, and has good effect in fine grain strengthening and dispersion strengthening.

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李鵬飛,范景蓮. ZrC含量對鎢材料組織和性能的影響[J].稀有金屬材料與工程,2016,45(11):2970~2974.[lipengfei, fanjinglian. Effect of ZrC content on Microstructure and properties of tungsten materials[J]. Rare Metal Materials and Engineering,2016,45(11):2970~2974.]
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  • 收稿日期:2014-08-13
  • 最后修改日期:2014-11-20
  • 錄用日期:2014-12-25
  • 在線發(fā)布日期: 2016-12-08
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