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塊體納米晶鎳的制備及力學(xué)性能研究
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國家自然科學(xué)基金(10502025)；江蘇省高校自然科學(xué)基金(05KJB1300421)


Preparation and Mechanical Properties of Bulk Nanocrystalline Nickel
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    摘要:

    采用直流電弧等離子體蒸發(fā)+預(yù)壓燒結(jié)法制得塊體納米晶鎳。對納米晶鎳的晶粒度、孔隙率進行了表征，對其壓縮強度、應(yīng)變速率敏感性及壓縮對晶格畸變、晶粒尺寸的影響進行了研究。結(jié)果表明，納米晶鎳的晶粒尺寸隨燒結(jié)溫度的升高而增大，725 ℃燒結(jié)時塊材相對致密度達97%。壓縮強度隨晶粒尺寸減小而增大，且與壓縮速率成正比；最大抗壓斷裂強度達到600 MPa，表現(xiàn)出較低的加工硬化和良好的塑性壓縮形變能力，斷口為沿晶斷裂；壓縮會引起晶格畸變量的減小和晶粒的細化

    Abstract:

    The bulk nanocrystalline nickel was prepared by DC arc plasma evaporation method and pre-press sintering. The grain size and porosity was characterized; the compression strength, the strain-rate sensitivity and the influence of the compression process on the grain size and lattice distortion of the specimens were investigated. The results show that the grain size increases with higher sintering temperature. At 725 oC, the relative density of the bulk nanocrystalline nickel is 97%. The compression strength increases with smaller grain size and it is proportional to the strain rate, and the highest compression fracture strength is 600 MPa. The specimen exhibits lower sensitivity to strain rate and lower working hardening exponent. The damage mechanism of the bulk nanocrystalline nickel is intergranular fracture, and the compression leads to the decrease of the grain size and lattice distortion

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巴志新,路承杰,張振忠,周建秋,張少明.塊體納米晶鎳的制備及力學(xué)性能研究[J].稀有金屬材料與工程,2010,39(4):628~632.[Ba Zhixin, Lu Chengjie, Zhang Zhenzhong, Zhou Jianqiu, Zhang Shaoming. Preparation and Mechanical Properties of Bulk Nanocrystalline Nickel[J]. Rare Metal Materials and Engineering,2010,39(4):628~632.]
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  • 收稿日期:2009-05-17
  • 最后修改日期:2010-03-15
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