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wan9000

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lehigh_73

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ÒýÓûØÌû:
Originally posted by tckyw at 2006-4-19 21:32:
ÎÒÏëÓ¦¸Ã·¢Õ¹³¬¸ßνṹ²ÄÁÏ£¬±Ï¾¹¸ßÎÐҶƬÏÖÔÚζÈÔ½À´Ô½¸ßÁË£¬ÆÕͨµÄNi»ù²ÄÁÏÒѾ­²»ÄÜÂú×ãÒªÇóÁË

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8Â¥2006-04-20 12:19:31
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tckyw

Ìú³æ (СÓÐÃûÆø)

TiAl

Yet its modest melting point
(1500C) precludes it from use in hightemperature
blades and restricts it to the
low-pressure turbine and static parts of
the engine. After more than 20 years of effort
on TiAl,8¨C11 it is not yet used in commercial
jet engines,

The problems
that remain include low roomtemperature
ductility (1¨C2%), low fracture
toughness, high stress-sensitivity of fatigue
life, and high manufacturing cost for
finished parts.
ÎÒÊDZ¿Ð¡¿µ£¡
9Â¥2006-04-20 20:14:14
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tckyw

Ìú³æ (СÓÐÃûÆø)

NiAl

Alloy parts based on this intermetallic
have been successfully made by a
variety of processes (e.g., investment casting,
powder metallurgy, hot extrusion,
and injection molding). Tests for application
as static parts for stationary turbines
have been successful. In NiAl alloy development
for jet-engine applications, both
directionally solidified eutectics and polycrystalline
multiphase structures have
been explored. Serious consideration for
engine applications will require better
toughness at room temperature and higher
creep strength at high temperatures.
ÎÒÊDZ¿Ð¡¿µ£¡
10Â¥2006-04-20 20:15:38
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