Make schematic sketches of the microstructures that would be observed for conditions of very slow cooling for a 50 wt% Pb -50 wt% Mg at (a) 500°C and (b) 300°C. Label all phases and indicate their approximate compositions. Composition (at% Pb) 10 20 30 40 70 100 700 1200 600 a +L Mg Pb M 1000 500 800 400 L L 600 Mg2Pb 300 400 200 a + Mg2Pb 100 200 Mg Pb 81% 16.920 34.7 40 60 61.5 80 100 (Mg) Composition (wt% Pb) (Pb) Temperature ("C) Temperature ("F)

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Types of loading

In mechanical terminology, the term load indicates that external force/weight, either constant or variable, acts on a mechanical member/structure. The weight of an object of a specific material is also an external load, and the external force that works on a structure comes under the categories of loading. The external load generates its effects as stress and strain in the structure.