Process for preparing block nano crystal/non-crystal alloy
Title：
Process for preparing block nano crystal/non-crystal alloy
Application Number：
 200410056890
Application Date：
 2004/08/30
Announcement Date：
 2005/03/23
Pub. Date：
 2007/06/20
Publication Number：
 1598034
Announcement Number：
 1322160
Grant Date：
 2007-6-20
Granted Pub. Date：
 2007-6-20
ApplicationType：
 Invention
State/Country：
 11[China|beijing]
IPC：
 C22F 1/00
Applicant(s)：
 Tsinghua Univ.
Inventor(s)：
 Yao Kefu
Key Words：
 preparing process, block, nano crystal, non-crystal alloy
Abstract：
 The invention relates to a method of preparing block millicron crystalsize/amorphous alloy, which belongs to the domain of metal millicron materials preparation technology. The direct current pulse supply of solid capacity charge/discharge is adopted. Aim at the features of block armophous alloy, Selecting current density range: j=100-100000 A/mm2. The processing time is between 2S and 60 min, current impulse width range: mu=10-200 mus, current impulse frequency range: f=2-5000 Hz. The standards are guaranteeing crystallization and gaining nm crystal grain, and not overheat leading to crystal grain growth. It utilizes the interact between current and metal atom to accelerate atomic diffusion and transfer, and product crystal nucleus and nm phase precipitation.
Claim：
Priority：
PCT：
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2008-4-17
  Selected patents owned by Tsinghua University filed in 2005 are loaded.
2008-3-31
  Selected patents owned by Tsinghua University filed in 2006 and 2007 are load.







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