Engineering Materials
Specify the sequence correctly

Grain growth, stress relief, recrystallization
Stress relief, grain growth, recrystallization
Grain growth, recrystallization, stress relief
Stress relief, recrystallization, grain growth

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Engineering Materials
Y-alloy contains

4 to 4.5% magnesium, 3 to 4% copper and rest aluminium
3.5 to 4.5% copper, 1.2 to 1.7% manganese, 1.8 to 2.3% nickel, 0.6% each of silicon, magnesium and iron, and rest aluminium
5 to 6% tin, 2 to 3% copper and rest aluminium
3.5 to 4.5% copper, 0.4 to 0.7% magnesium, 0.4 to 0.7% manganese and rest aluminium

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Engineering Materials
Which of the following statement is true about brittle fracture?

Brittle fracture is always preceded by noise
Many metals with hexagonal close packed (H.C.P) crystal structure commonly show brittle fracture
High temperature and low strain rates favour brittle fracture
Cup and cone formation is characteristic for brittle materials

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