Visual Testing (VT) Practice Exam

What does embrittlement, caused by a physical or chemical change in metal, lead to?

1. ductility

2. hardness

3. hydrogen

4. all of the above

The correct answer is: ductility

Embrittlement refers to a process that decreases the ductility of a material, particularly metals, making them more brittle. When metals undergo embrittlement due to physical or chemical changes, they lose their ability to deform plastically without breaking. In the context of this question, ductility is a crucial property of metals that allows them to be stretched or deformed under tensile stress. When embrittlement occurs, the ability of the metal to undergo this deformation is compromised, leading to increased risk of fracture when subjected to stress. Although embrittlement may also impact hardness or may involve hydrogen in certain contexts, the primary and most immediate effect is the loss of ductility. Thus, the focus on ductility is correct, as embrittlement significantly impacts this mechanical property, ultimately affecting the overall performance and reliability of the metal in application. This is particularly relevant in industries where metals are used under stress and may encounter fatigue or impact loads, making the understanding of embrittlement vital for material selection and safety considerations.