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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 |