Title:
NANO-TWINNED CRYSTAL PURE IRON, AND PREPARATION METHOD AND PROCESS THEREFOR
Document Type and Number:
WIPO Patent Application WO/2017/201986
Kind Code:
A1
Abstract:
A method for preparing nano-twinned crystal pure iron, comprising: a. heating a processed sample to a range of a phase change temperature of a material; b. applying a pressure of 1-5 GPa to the sample in all directions; c. maintaining the temperature for 3-60 min at a selected pressure point; and d. randomly keeping a selected pressure value during cooling, and releasing the pressure when reaching room temperature; or loading a superhigh pressure of 1-5 GPa before heating. By limiting volumetric expansion during phase change, internal stress of phase change is fully released inside the material, so that a great amount of lattice defects and nano-twinned crystals are formed (the thickness of the nano-twinned crystals is less than 10 nm), the dislocation density of the nano-twinned crystals is approximately 1016-1017/m2, and the hardness thereof is increased by 4-10 times compared with an unprocessed steel material.
Inventors:
WANG YU HUI (CN)
ZHANG HONGWANG (CN)
ZHANG HONGWANG (CN)
Application Number:
PCT/CN2016/106101
Publication Date:
November 30, 2017
Filing Date:
November 16, 2016
Export Citation:
Assignee:
UNIV YANSHAN (CN)
International Classes:
C21D8/00; C22C38/00
Foreign References:
| CN102690936A | 2012-09-26 | |||
| CN101429621A | 2009-05-13 | |||
| US20100051146A1 | 2010-03-04 | |||
| JP2013185249A | 2013-09-19 |
Attorney, Agent or Firm:
SHIJIAZHUANG, ZHONGZHIHUAQING, INTELLECTUAL PROPERTY FIRM (SPECIAL GENERAL PARTNER (CN)
Download PDF:
Previous Patent: AQUEOUS PEELABLE COATING
Next Patent: ANTISTATIC COMPOSITE NANOMATERIAL FILM AND PREPARATION METHOD THEREOF
Next Patent: ANTISTATIC COMPOSITE NANOMATERIAL FILM AND PREPARATION METHOD THEREOF