Assume you have a metal alloy - an aluminum alloy for example -
that has been welded and then heat treated in a way that leaves you
uncertain as to the microstructure. Since the component is to be
used for a critical application, you want to be sure of both the
structure and mechanical properties. You want to create a single
phase structure so that you can "start over" with a new heat treat
cycle to more exactly and carefully...
1. What are the age hardening alloy systems in Al-based alloys
based on classification of major alloyingsystems for Al-based
alloys?
2.In alloy system of Al - 4.4%Cu - 0.8%Si - 0.8%Mn - 0.5%Mg
which is commonly used for aircraft structures, sketch and explain
all transformation stages during age hardening. What is the driving
mechanism for each step?
An annealed aluminum alloy slab with a thickness of 12 mm and
width of 1m is to be cold rolled to a thickness of 9 mm using
2-high rolls with roll diameter of 1m. The rolls have a coefficient
of friction of 0.08 and they are rotating with a speed of 18 RPM.
The aluminum has an entrance speed of 50 m/min and a width that
does not change as a result of drawing. The strength coefficient K
=240 and...
The diameters of aluminum alloy rods produced on an extrusion
machine are known to have a standard deviation of 0.0001 in. A
random sample of 25 rods has an average diameter of 0.5046 in.
(a) Test the hypothesis that mean rod diameter is 0.5025 in.
Assume a two-sided alternative and use
(b) Find the P-value for this test.
(c) Construct a 95% two-sided confidence interval on the mean
rod diameter.