Title:
PROCESSING METHOD FOR IMPROVING HIGH-TEMPERATURE CREEP PROPERTIES OF MAGNESIUM ALLOY BY MEANS OF ROLLING AND PRE-COMPRESSION
Document Type and Number:
WIPO Patent Application WO/2022/141874
Kind Code:
A1
Abstract:
Disclosed in the present invention is a processing method for improving the high-temperature creep properties of a magnesium alloy by means of rolling and pre-compression; the mass percentage composition of the magnesium alloy is Al: 8.5-9.5%, Zn: 0.45-0.90%, Mn: 0.15-0.4%, and Y: 0.3-0.8%, the remainder being magnesium and non-removable impurity elements; and the processing method comprises the following steps: 1) implementing solid solution treatment of the magnesium alloy; 2) rolling the solid solution state magnesium alloy, the rolling temperature being 300-400°C, the rolling speed being 0.2-0.6 m/s, the number of rolling passes being 3-8 times, and the total amount of deformation being 50-80%; 3) implementing pre-compression deformation of the rolled state magnesium alloy, the pre-compression direction being perpendicular to the rolling plate surface, the pre-compression temperature being 20-100°C, the compressive strain being 0.01-0.02, the strain rate being 1x10-4s-1-2x10-4s-1, and the compression deformation being maintained for more than 5 minutes. The present invention, by means of controlling the structure of the magnesium alloy, enables creep dynamic precipitation of the magnesium alloy to occur during high-temperature creep; the creep dynamic precipitation phase increases the thermal stability of the material, improving the high-temperature creep properties.
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Inventors:
HUANG WEIYING (CN)
LI WEI (CN)
HUANG HUANG (CN)
ZHOU LIBO (CN)
QIU WEI (CN)
LI WEI (CN)
HUANG HUANG (CN)
ZHOU LIBO (CN)
QIU WEI (CN)
Application Number:
PCT/CN2021/084244
Publication Date:
July 07, 2022
Filing Date:
March 31, 2021
Export Citation:
Assignee:
UNIV CHANGSHA SCIENCE & TECH (CN)
International Classes:
C22C23/02; B21B3/00; C22F1/06
Foreign References:
| CN108220725A | 2018-06-29 | |||
| CN109554646A | 2019-04-02 | |||
| CN104451484A | 2015-03-25 | |||
| CN103388115A | 2013-11-13 | |||
| EP3650567A1 | 2020-05-13 |
Other References:
QIU WEI, ET AL.: "Research Progress on Grain Refinement of Cast Magnesium Alloy", ZHUZAO JISHU = FOUNDRY TECHNOLOGY, XI'AN SHI ZHUZAO XUEHUI, CN, vol. 41, no. 11, 18 November 2020 (2020-11-18), CN , pages 1077 - 1087, XP055948566, ISSN: 1000-8365, DOI: 10.16410/j.issn1000-8365.2020.11.018
GUO XIAOQIAN: "Study on Large Strain Behavior of Polycrystalline Materials Based on Polycrystal Plasticity Model", 31 March 2017 (2017-03-31), XP055948571, ISSN: 5646-3474
GUO XIAOQIAN: "Study on Large Strain Behavior of Polycrystalline Materials Based on Polycrystal Plasticity Model", 31 March 2017 (2017-03-31), XP055948571, ISSN: 5646-3474
Attorney, Agent or Firm:
HUNAN ZHAOHONG PATENT LAW OFFICE (GENERAL PARTNERSHIP) (CN)
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