Modul 7 Praktikum Metalografi

Summary

In this instructional video, Setiano Desa explains the process of metallographic testing in a materials science laboratory. The purpose is for students to analyze the micro and macro structures of metals using an optical microscope. The video covers the procedure of examining two specimens (iron-aluminum alloy and aluminum), taking images at different magnifications (10x, 40x, and 60x), and saving the results. The focus is on capturing images of metal structures to understand their properties, providing a practical demonstration of metallographic analysis.

Takeaways

• 😀 Introduction to the practicum on metallography, where students analyze the structure of metals using an optical microscope.
• 😀 The goal is for students to be able to analyze both the micro and macro structures of metal alloys.
• 😀 The first specimen is a combination of iron and aluminum welded together, and the second specimen is aluminum.
• 😀 The process involves using different magnifications: 10x, 40x, and 60x to observe and analyze the metal structures.
• 😀 Students take photos of the microstructures at each magnification and save them in a file directory.
• 😀 The procedure starts with setting the microscope to 10x magnification, adjusting the specimen for clarity.
• 😀 The magnification is then increased to 40x, followed by 60x, to observe finer details of the structure.
• 😀 The photos are saved with filenames that indicate the magnification used (e.g., 'perbesaran 10 kali' for 10x).
• 😀 The practicum emphasizes learning the difference between micro and macro observations of metal structures.
• 😀 The practicum concludes with a brief farewell and a final greeting in the context of the lab session.

Q & A

What is the main purpose of this material testing practical session?

The main purpose of this practical session is to enable students to analyze the micro and macro structures of metals using an optical microscope, as well as to capture micro and macro photos using the same microscope.

What is metalography?

Metalography is the study of the microstructure characteristics of metals and their alloys. It focuses on analyzing the structure of materials at the microscopic level.

What are the three methods of metalographic testing mentioned in the script?

The three methods of metalographic testing mentioned are microscopy, diffraction, and x-ray analysis.

Which method will be used during this practical session?

In this practical session, the microscopy method will be used for metalographic testing.

What are the two types of observations in microscopy?

The two types of observations in microscopy are micro observation, which uses magnification greater than 100 times, and macro observation, which uses magnification between 10 and 100 times.

What materials are used for testing in this practical session?

The two materials used for testing in this session are a metal alloy made of iron and aluminum welded together, and a pure aluminum specimen.

How is the specimen prepared for microscopic observation?

The specimen is placed on the microscope stage, the light is turned on, and the specimen is adjusted using the microscope's controls to achieve a clear image for observation.

What is the first magnification setting used during the observation process?

The first magnification setting used is 10x.

What do students do once the image is clearly visible on the computer screen?

Once the image is clearly visible on the computer screen, students take a photo of the structure and save it in the specified directory with an appropriate file name corresponding to the magnification level.

How are higher magnifications used during the practical session?

After the 10x magnification, students increase the magnification to 40x and then 60x, adjusting the microscope height to ensure the structure is clear before taking additional photos at each magnification level.