Age Hardening in Aluminum Alloys
1. The first step in the age-hardening treatment is:
2. In a material, a shear stress of 400 MPa is required to cut the precipitate of diameter 4 µm. If the precipitate size is increased to 16 µm, the shear stress (in MPa) to cut the precipitate would be:
3. The shearing stress is proportional to:
Consider Al - 4 wt. % Cu alloy. The sequence of precipitation is:
If the load applied is 0.5 kgf and indentation size (diagonal length) is 86 µm, The Vickers hardness (in HV) is: