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The O
same O
samples S-CONPRI
were O
imaged O
non-destructively O
before O
and O
after O
HIP S-MANP
and O
aligned O
carefully O
for O
side-by-side O
viewing O
. O
High O
pore S-PRO
closure O
efficiency O
is O
demonstrated O
for O
all O
types O
of O
cavities O
and O
pores S-PRO
investigated O
, O
but O
near-surface O
pores S-PRO
of O
all O
types O
are O
shown O
to O
be S-MATE
problematic O
to O
varying O
degrees O
, O
in O
some O
cases O
perforating S-CONPRI
the O
superficial O
surface S-CONPRI
and O
creating O
new O
external O
notches S-FEAT
. O
Subsequent O
heat B-MANP
treatments E-MANP
( O
annealing S-MANP
after O
HIP S-MANP
) O
in O
some O
cases O
resulted O
in O
internal O
pore S-PRO
reopening O
for O
previously O
closed O
internal O
pores S-PRO
as S-MATE
well O
as S-MATE
a O
new O
“ O
blistering O
” O
effect O
observed O
for O
some O
near-surface O
pores S-PRO