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一種亞共析鈾鈮合金的凝固特點(diǎn)及顯微偏析研究
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中國科學(xué)院金屬研究所,中國科學(xué)院金屬研究所,中國科學(xué)院金屬研究所,中國工程物理研究院,中國工程物理研究院

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Solidification Characteristics and Micro-Segregation of Sub-Eutectiod U-Nb alloy
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Institute of Metal Research,Chinese Acdimic of Science,Institute of Metal Research,Chinese Acdimic of Science,Institute of Metal Research,Chinese Acdimic of Science,China Academy of Engineering Physics,Mianyang Sichuan,China Academy of Engineering Physics,Mianyang Sichuan

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    摘要:

    分析了一種亞共析U-Nb合金的凝固過程,獲得了該合金的固相線、液相線溫度和固-液兩相區(qū)的殘余液相體積。發(fā)現(xiàn)凝固末期殘余液體不能形成液體網(wǎng),凝固枝晶很快互相連接,形成一些較大的孤立的液體池,凝固末期這種不能補(bǔ)縮的液體池易形成嚴(yán)重的疏松,理論初步計(jì)算合金的顯微疏松量約為1.6%。發(fā)現(xiàn)合金中鈮是嚴(yán)重的負(fù)偏析合金元素,凝固中期和凝固末期凝固系數(shù)k僅為0.16和0.11,極易在枝晶干偏聚造成枝晶偏析。

    Abstract:

    The solidus, liquidus and volume of residual liquid were achieved by study the solidification behavior of a sub-eutectiod U-Nb alloy. It is found under metallographic observation that their microstructure reveals as the dentritic crystal connected each other and residual liquid separated by solid phase during terminal solidification. Thus, serious micro-porosity form easily in oisolated residual liquid area for the filling channels plugging and residual liquid unable to fill the pore, and the amount of porosity in casting is about 1.6% derived from theoretical calculation. The chemical analysis results showed that segregation coefficients of niobium at intermediate and terminal solidifaction are 0.16 and 0.11 respectively, which indicated that Nb is a strong negative segregation element and it severely cluster in the dendritic area.

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陳波,趙秀娟,劉奎,陳世俊,王震宏.一種亞共析鈾鈮合金的凝固特點(diǎn)及顯微偏析研究[J].稀有金屬材料與工程,2018,47(2):642~646.[B. CHEN, X. J. ZHAO, K. LIU, S. J. CHEN, Z. H. WANG. Solidification Characteristics and Micro-Segregation of Sub-Eutectiod U-Nb alloy[J]. Rare Metal Materials and Engineering,2018,47(2):642~646.]
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  • 收稿日期:2015-11-16
  • 最后修改日期:2017-06-14
  • 錄用日期:2017-06-26
  • 在線發(fā)布日期: 2018-03-15
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