Why is the mechanical strength of the HAZ next to the fusion
line of a heat treatable
aluminum alloy much lower
than that of the base metal?
Why does the mechanical strength of the HAZ of a heat treatable
aluminum alloy increase
with distance from the
fusion line?
Why is the mechanical strength of the HAZ next to the fusion
line of a non-heat treatable
aluminum alloy much lower
than that of the base metal?
Why does the mechanical strength of the HAZ of a non-heat
treatable aluminum alloy
increase with distance from
the fusion line?
1. The fusion of iron nuclei does not occur in stable stars. Why
not? a) no star ever gets hot enough for iron fusion b) elements
more massive than iron aren't stable c) iron fusion uses up energy
rather instead of producing energy d) iron is destroyed in stars as
soon as it is produced 2. The oldest stars in the galaxy have a
____ abundance of heavier chemical elements than the sun a) higher
b) lower c) similar 3....