1. True or false? In crystals, there exists an atomic mismatch within the regions where grains meet. These regions are called grain boundaries and they possess a lower energy than external surfaces A)True B)False 4. Some hypothetical alloy is composed of 30 wt% of metal A and 70 wt% of metal B. If the densities of metals A and B are 8.3 and 10.7 g/cm3, respectively, whereas their respective atomic weights are 115 and 108 g/mol, determine whether the crystal structure for this alloy is simple cubic, face-centered cubic, or body- centered cubic. Assume a unit cell edge length of 0.332 nm. (Non-anonymous question O)

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Analysis and Procedures for Material Selection

The term material selection means to select the right material for various engineering applications. There are various engineering materials available and each has different individual properties. Thorough knowledge of the material properties and behavior is crucial in the design process. For instance, a structural member, such as a beam, is used to support vertical shear loads by the building itself. To withstand such loads, the material of the beam must possess adequate strength and stiffness to resist any deformation that might lead to the formation of cracks.