Morphology of Interface near Absolute Stable Growth Rate and Crystalline Anisotropy

接近绝对稳定生长速率和晶体各向异性的界面形貌

• 批准号: 10650728
• 负责人: MIYATA Yasunori
• 金额: $ 1.86万
• 依托单位: Nagaoka University of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10650728/
• 关键词: laser; rapid solidification; dendrite; cellular-interface; growth rate; primary-spacing; absolute stability; 界面形態; 絶対安定; 急速凝固; 臨界成長; 局所平衡

Al-Cu alloy is remelted by YAG laser and solidified rapidly in order to study the micro-tructure in the solidification. Specimen is cut out from the single crystal, because the initial micro-structure will affect the resultant micro-structure after laser treatment. The solidification is realized with growth rate near the absolute stability. The micro-structure is observed by the scanning microscope and the primary arm spacing is measured with the growth rate. The growth rate of dendrite and the temperature gradient at the interface are numerically estimated by the finite element method for heat conduction, MARC.The observed morphology is cellular -dendrite with very short arms. The primary spacing of dendrite decreased with growth rate, but the rate of decrease becomes smaller and smaller with increasing growth rate up to the absolute stability. The experimental primary spacing is compared with the available theoretical one. The theory is constructed for arrayed cellular-dendrite and the agreement between experiment and prediction is shown very well.

为了研究凝固过程中的微观组织，采用YAG激光重熔Al-Cu合金并快速凝固。样品是从单晶上切下来的，因为初始的微观结构会影响激光处理后所得的微观结构。以接近绝对稳定的增长率实现凝固。通过扫描显微镜观察微观结构，并用生长速率测量主臂间距。通过导热有限元法MARC对枝晶的生长速率和界面处的温度梯度进行了数值估计。观察到的形貌是具有非常短臂的细胞状枝晶。枝晶初生间距随着生长速率的增加而减小，但随着生长速率的增加，减小的幅度越来越小，直至达到绝对稳定。将实验初级间距与可用的理论间距进行比较。该理论是针对阵列细胞树突构建的，并且实验与预测之间的一致性非常好。

项目成果

宮田保教、本間武道: "一方向凝固におけるサクシノニトリル・アセトン系合金成長 形態の結晶方位依存性"日本金属学会誌. 63・12. 1490-1496 (1999)

Yasunori Miyata、Takedo Honma：“单向凝固过程中丁二腈-丙酮合金生长形态的晶体取向依赖性”日本金属学会杂志 63・12（1999）。

宮田保教、本間武道: "一方向凝固におけるサクシノニトリル・アセトン系合金成長形態の結晶方位依存性"日本金属学会誌. 63・12. 1490-1496 (1999)

Yasunori Miyata、Takedo Honma：“单向凝固过程中丁二腈-丙酮合金生长形态的晶体取向依赖性”日本金属学会杂志 63・12（1999）。

Yasunori Miyata and Takemiti Honma: "Change in Growth Morphology of Succinonitrile-acetone Alloy with Crystallographic Orientation during Unidirectional Solidification"J. Japan Inst. Metals. Vol. 63, No. 12. 1491-1496 (1999)

Yasunori Miyata和Takemiti Honma：“单向凝固过程中丁二腈-丙酮合金的生长形态随晶体取向的变化”J。