| 李勇,朱靖,王莹,李焕,赵亚茹.定向凝固Cu-0.33Cr-0.1Ti亚共晶合金中带状组织的形成机理[J].材料导报,2018,32(4):602-605 |
| 定向凝固Cu-0.33Cr-0.1Ti亚共晶合金中带状组织的形成机理 |
| Formation Mechanism of Band Structure in Directionally Solidified Cu-0.33Cr-0.1Ti Hypoeutectic Alloy |
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| DOI：10.11896/j.issn.1005-023X.2018.04.019 |
| 中文关键词: 定向凝固 Cu-0.33Cr-0.1Ti 亚共晶合金 带状组织 溶质分布 |
| 英文关键词: directional solidification, Cu-0.33Cr-0.1Ti, hypoeutectic alloy, band-like microstructure, solute distribution |
| 基金项目:基金项目:国家自然科学基金(51561007；51261007)；江西省自然科学基金(20161BBM26036)；江西理工大学青年英才支持计划资助 |
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| 中文摘要: |
| 考察了Cu-0.33Cr-0.1Ti亚共晶合金在凝固速率为20 μm/s下的定向凝固组织,利用SEM和EDS对带状组织的形貌和成分进行了分析,并从动力学、形核条件等方面探讨了带状组织形成的原因和机理。结果表明,该带状组织是由单相胞状α-Cu相与(α-Cu)+(β-Cr)共晶组织交替生长形成,带状组织的产生与定向凝固界面前沿的溶质分布有关,即主要受溶质浓度、有效溶质系数和凝固速率等因素的影响。 |
| 英文摘要: |
| The directional solidification structures of the Cu-0.33Cr-0.1Ti hypoeutectic alloy at solidified rate of 20 μm/s were investigated. The morphology and composition of the band-like microstructure were analyzed by means of SEM and EDS. The reason and mechanism of formation of band-like microstructure were discussed based on the dynamics, nucleation conditions. The results showed that the band-like microstructures were formed by the alternation of the monocrystalline α-Cu phase and the (α-Cu)+(β-Cr) eutectic structure. The formation of the band-like microstructure was related to the solute distribution at the front of solid-liquid interface, which was mainly affected by solute concentration, effective solute coefficient and solidification rate and other factors. |
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