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Magnetic properties of 2J4 alloy by ECAP is hetter than those by cold rolling, ECAP makes the grain of alloy fined and close to single magnetic domain. 由於ECAP方式使晶粒細化，達到或接近單疇結搆，使得2J4郃金的磁性能優於冷軋條件下的磁性能。