眾所周知，鑄造是機械中最重要的成形方法。鑄件的質量和性能很大的程度上取決於凝固組織的特徵，而凝固組織主要受合金成分、冷卻速率和冷卻方向等控制，生產出不同的化學跟物理變化，進一步應用在各項領域當中。
本文針對錫鉛合金之方向性凝固製備，使用三種不同濃度的錫-鉛合金(Sn-10%Pb)、(Sn-37%Pb)、(Sn-60%Pb)作為研究材料，當中藉由不同冷卻介質及磁鐵產生的磁場，控制參數互相搭配產生出不同實驗組別，探討在巨觀及微觀之金相組織、冷卻曲線、成長速率、溫度梯度、晶粒尺寸、硬度值。

It is common knowledge that Casting is the most important forming method in machinery.
The quality and performance of castings depend to the characteristics of the solidification structure and solidification structure is mainly controlled by the alloy composition, colling rate and cooling direction, resulting in different chemical and physical changes, which can be applied in various filed.

In this study, Pb-Sn alloys were used by directional solidification using three different concentrations of Pb-Sn alloys (Sn-10wt.%Pb), (Sn-37wt.%Pb) and (Sn-60wt.%Pb) were used as the study material. Using different Colling Medium and magnetic field to study the solidification process through different experimental groups. After the experiment is completed, we will discuss the macroscopic and microscopic metallographic organization, cooling curves, temperature gradient, growth rate, grain size and hardness values.

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