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凝固速率對(duì)鈮基共晶自生復(fù)合材料定向凝固組織的影響
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TG146.416

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Effect of Solidifying Rate on Directionally Solidified Microstructure of Niobium Based In-Situ Composites
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    摘要:

    鈮基共晶自生復(fù)合材料（NBISC）經(jīng)真空自耗電弧熔煉成母合金錠，采用高溫度梯度的電子束區(qū)熔裝置制備定向凝固的試樣，分析其組織特征。結(jié)果表明：Nb基固溶體（Nbss）相、（Nb，Ti）3Si相和（Nb，Ti）5Si3相為NBISC材料的主要組成相；在電了束區(qū)熔條件下，隨著電子槍移動(dòng)速率的提高，NBISC材料共晶組織變細(xì)，組織中片層狀的共晶團(tuán)增多，塊狀或板條狀的（Nb，Ti）3Si／（Nb，Ti）5Si3相尺度減小、數(shù)量增多，組織趨于規(guī)則、分布更均勻，組織的定向性增強(qiáng)，定向效果顯著。

    Abstract:

    An ingot of Nb based in-situ composites (NBISC) was produced by a vacuum self-consuming arc melting furnace. The directionally solidified samples were prepared by an electron beam floating zone melting (EBFZM) furnace with a high temperature gradient, and their microstructural characteristics were analyzed. The results show that the microstructure of as-cast NBISC is composed of primary dendrites of Nb solid solution (Nbss) and the eutectic colonies of Nbss plus (Nb,Ti)3Si/(Nb,Ti)5Si 3. In the EBFZM furnace, with the increase of withdrawing rate, the eutectic microstructure of NBISC is refined. The amount of eutectic colonies layers increases. The sizes of (Nb,Ti)3Si/(Nb,Ti)5Si3 lumps or plates decrease and their amount increases. Their morphology tends to more regular, and the distribution becomes more homogeneous. The directionality becomes intensive and the directionally solidified effects are remarkable.

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丁旭 周廉 郭喜平 周義剛 張廷杰 李中奎.凝固速率對(duì)鈮基共晶自生復(fù)合材料定向凝固組織的影響[J].稀有金屬材料與工程,2005,34(10):1605~1608.[Ding Xu, Zhou Lian, Guo Xiping, Zhou Yigang, Zhang Tingjie, Li Zhongkui. Effect of Solidifying Rate on Directionally Solidified Microstructure of Niobium Based In-Situ Composites[J]. Rare Metal Materials and Engineering,2005,34(10):1605~1608.]
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  • 收稿日期:2005-04-12
  • 最后修改日期:2005-05-20
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