금속 표면에 IMC 생성 시 Crack 발생의 원인

다음의 세 가지 정도의 원인을 생각해 볼 수 있다.

CTE(Coefficient of thermal expansion) mismatch

Volume change during the formation of IMC

Defects by many reasons, such as the Kirkendall effect

 

크랙을 발생시키는 원인들

During the growth of intermetallic compounds, cracks can form due to several factors. One of the main factors is the difference in thermal expansion coefficients between the intermetallic compound and the surrounding metal matrix. This can lead to stress buildup in the intermetallic compound, which can eventually result in crack formation.

Another factor that can contribute to crack formation is the presence of impurities or defects in the intermetallic compound. These impurities or defects can act as stress concentration points, leading to crack initiation and propagation.

 

Furthermore, the growth of intermetallic compounds can also be influenced by the processing conditions, such as temperature and strain rate. Rapid cooling rates, for example, can lead to the formation of brittle phases within the intermetallic compound, which can increase the susceptibility to cracking.

 

In summary, crack formation during the growth of intermetallic compounds can be influenced by factors such as thermal expansion mismatch, impurities or defects, and processing conditions. Understanding these factors is important for developing strategies to mitigate or prevent cracking in intermetallic compounds.

 

금속간화합물 생성 시 체적 변화에 대한 문제

During the formation of intermetallic compounds (IMCs), there is usually a volume change that occurs due to the rearrangement of atoms as they form the new compound. This volume change can lead to stress buildup in the material, which can contribute to cracking and other forms of damage.

 

The volume change during IMC formation depends on a variety of factors, including the specific elements involved, the crystal structure of the resulting compound, and the conditions under which the reaction occurs. In some cases, the volume change may be small and relatively benign. In contrast, in other cases, it can be significant and pose a risk to the structural integrity of the material.

 

One common approach to minimizing the impact of volume changes during IMC formation is to carefully control the conditions under which the reaction occurs. This can include optimizing the temperature, pressure, and other environmental factors to ensure that the reaction proceeds in a controlled and predictable manner. Additionally, materials engineers may choose to alloy different elements together in specific ratios or use other techniques to minimize the volume change and reduce the risk of damage during IMC formation.