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A Method for Eliminating the Porteven-Le Chatelier Effect of Al-Mg Alloys at Low Strain Rate Conditions

An aluminum-magnesium alloy, low-strain technology, applied in the field of aluminum-magnesium alloy processing, can solve the problems of low cost and high efficiency, and achieve the effect of eliminating the PLC effect

Active Publication Date: 2022-05-27
SHANGHAI JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problem that the aluminum-magnesium alloy will produce the Porteven-Le Chatelier effect under the condition of low strain rate, the present invention proposes a method of introducing in-situ self-generated TiB into the aluminum-magnesium alloy. 2 The method of nano ceramic particles, the TiB prepared by the method 2 The aluminum-magnesium matrix composite material reinforced by nano-ceramic particles will not produce PLC effect at low strain rate, and this process is simple to operate, low in cost and high in efficiency, which can fully meet the needs of industrial production of aluminum-magnesium alloys

Method used

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  • A Method for Eliminating the Porteven-Le Chatelier Effect of Al-Mg Alloys at Low Strain Rate Conditions
  • A Method for Eliminating the Porteven-Le Chatelier Effect of Al-Mg Alloys at Low Strain Rate Conditions

Examples

Experimental program
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Effect test

Embodiment 1

[0028] With high purity aluminum, industrial pure magnesium, KBF 4 and K 2 TiF 6 Preparation of Al-5.7Mg alloy and in-situ autogenous 8wt.% TiB as raw materials 2 For the reinforced Al-5.7Mg alloy composite material, the final material is in the extruded state, and the steps are as follows:

[0029] (1) Put industrial 99.999% high-purity aluminum into a graphite crucible and heat to melting, cover with JZF-03 high temperature covering agent and heat up to 915°C;

[0030] (2) 99% pure KBF for industrial use 4 and 99% pure K for industrial use 2 TiF 6 Two kinds of reaction salts are evenly mixed at a mass ratio of 1:2, added to the melt in step (1) after drying, and mechanically stirred at a speed of 700rpm;

[0031] (3) After the reaction, take out the reaction by-products, cool and cast to obtain 11.8wt.% TiB 2 / Al masterbatch;

[0032] (4) 11.8wt.% TiB 2 / Al masterbatch is heated to 760℃ after being melted, and JZJ type harmless aluminum alloy refining agent is added...

Embodiment 2

[0038] With high purity aluminum, industrial pure magnesium, KBF 4 and K 2 TiF 6 Preparation of Al-5.2Mg alloy and in-situ autogenous 8wt.% TiB as raw materials 2 The reinforced Al-5.2Mg alloy composite material, the final material is in the extruded state, and the steps are as follows:

[0039] (1) Put industrial 99.999% high-purity aluminum into a graphite crucible and heat to melting, cover with JZF-03 high-temperature covering agent and heat up to 900 ° C;

[0040] (2) 99% pure KBF for industrial use 4 and 99% pure K for industrial use 2 TiF 6 Two kinds of reaction salts are evenly mixed at a mass ratio of 1:2, added to the melt in step (1) after drying, and mechanically stirred at a speed of 700rpm;

[0041] (3) After the reaction, take out the reaction by-products, cool and cast to obtain 11.8wt.% TiB 2 / Al masterbatch;

[0042] (4) 11.8wt.% TiB 2 / Al masterbatch is heated to 760℃ after being melted, and JZJ type harmless aluminum alloy refining agent is added f...

Embodiment 3

[0048] With high purity aluminum, industrial pure magnesium, KBF 4 and K 2 TiF 6 Preparation of Al-5.7Mg alloy and in-situ autogenous 7.8wt.%TiB as raw materials 2 For the reinforced Al-5.7Mg alloy composite material, the final material is in the extruded state, and the steps are as follows:

[0049] (1) Put industrial 99.999% high-purity aluminum into a graphite crucible and heat to melting, cover with JZF-03 high-temperature covering agent and heat up to 850 ° C;

[0050] (2) 99% pure KBF for industrial use 4 and 99% pure K for industrial use 2 TiF 6 Two kinds of reaction salts are evenly mixed at 2:1, added into the melt in step (1) after drying, and mechanically stirred at a speed of 700rpm;

[0051] (3) After the reaction, take out the reaction by-products, cool and cast to obtain 11.8wt.% TiB 2 / Al masterbatch;

[0052] (4) 11.8wt.% TiB 2 / Al master batch is heated to 770℃ after being melted, and JZJ type harmless aluminum alloy refining agent is added for slag ...

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Abstract

The invention discloses a method for eliminating the Porteven-Le Chatelier effect of an aluminum-magnesium alloy under the condition of a low strain rate, which comprises: heating industrial high-purity aluminum until melting, covering it with a high-temperature covering agent and raising the temperature; KBF 4 and K 2 TiF 6 Mix evenly in proportion, add to the melt after drying and stir mechanically; take out the reaction by-products after the reaction, cool and cast the obtained TiB 2 After heating the Al masterbatch until it melts, continue to heat up, add a harmless aluminum alloy refining agent to remove slag and refine; control the temperature, add industrial high-purity aluminum and industrial high-purity magnesium in turn, heat up and remove slag, and then mechanically stir; add covering agent to the melt, extract to a vacuum for 10 minutes, poured into a mold to form a slab; the resulting in-situ self-generated TiB 2 Unidirectional hot extrusion deformation of particle-reinforced Al‑Mg alloy composites. In the present invention, the in-situ self-generated TiB 2 The method of introducing nano-ceramic particles into aluminum-magnesium alloys eliminates the Porteven-Le Chatelier effect of aluminum-magnesium alloys at low strain rates.

Description

technical field [0001] The invention belongs to the technical field of aluminum-magnesium alloy processing, in particular to a method for eliminating the Portvin-Le Chatelier effect of the aluminum-magnesium alloy under the condition of low strain rate. Background technique [0002] The development of modern technology has gradually increased the requirements for material properties in industrial applications, especially in high-end fields such as aerospace, automobile manufacturing, and electronic instruments, which have extremely strict requirements on the comprehensive properties of materials. These fields usually require materials not only with high strength and good plasticity, but also with excellent specific strength and specific stiffness. Today, when the idea of ​​lightweight and sustainable development is deeply rooted in the hearts of the people, aluminum-magnesium alloys occupy a place in the field of structural materials due to their high specific strength, good...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/10C22C1/02C22C1/06C22C21/06C22C32/00
CPCC22C1/1036C22C1/06C22C21/06C22C32/0073C22C1/1052
Inventor 陈翔陈汉胡磊王磊吴一陈哲王浩伟
Owner SHANGHAI JIAOTONG UNIV