Engineering Materials
Stress relaxation is the phenomenon

In which parts are not loaded
Stress reduces on increasing load
In which stress remains constant on increasing load
In which deformation tends to loosen the joint and produces a stress reduced

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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
3.5 to 4.5% copper, 0.4 to 0.7% magnesium, 0.4 to 0.7% manganese and rest aluminium
5 to 6% tin, 2 to 3% copper and rest aluminium

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