recrystallization in metals - Course Notes - McMaster University
recrystallization in metals - Course Notes - McMaster University
recrystallization in metals - Course Notes - McMaster University
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Pulse lasers<br />
“ULTRA FAST” HEAT TREATMENT: PULSE LASER IRRADIATION<br />
(nano/pico/femtosecond)<br />
Laser pulse:<br />
Energy (nJ to µJ)<br />
Time (fsec to nsec)<br />
Beam size (µm to mm)<br />
~100 nm<br />
to mm<br />
Small volume on the surface<br />
Rapid heat<strong>in</strong>g and cool<strong>in</strong>g<br />
(10 4 to 10 12 K/sec)<br />
Increase <strong>in</strong> pressure (up to TPa)<br />
Shock wave.<br />
Cooperation with Preston/Haugen group<br />
27
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