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Method for eliminating Portevin-Le Chatelier effect of aluminum magnesium alloy under low strain rate condition

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: 2021-05-07
SHANGHAI JIAO TONG 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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  • Method for eliminating Portevin-Le Chatelier effect of aluminum magnesium alloy under low strain rate condition
  • Method for eliminating Portevin-Le Chatelier effect of aluminum magnesium alloy under low strain rate condition

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 autogeneous 8wt.%TiB as raw material 2 Reinforced Al-5.7Mg alloy composite material, the final material is extruded state, the steps are as follows:

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

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

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

[0032] (4) 11.8wt.%TiB 2 / Al masterbatch is heated to melting, then continue to heat up to 760°C, add JZJ type harmless aluminum alloy ref...

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 autogeneous 8wt.%TiB as raw materials 2 Reinforced Al-5.2Mg alloy composite material, the final material is extruded state, the steps are as follows:

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

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

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

[0042] (4) 11.8wt.%TiB 2 / Al masterbatch is heated to melting, then continue to heat up to 760°C, add JZJ type harmless aluminum alloy re...

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 autogeneous 7.8wt.%TiB as raw material 2 Reinforced Al-5.7Mg alloy composite material, the final material is extruded state, the steps are as follows:

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

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

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

[0052] (4) 11.8wt.%TiB 2 / Al masterbatch is heated to melting, then continue to heat up to 770°C, add JZJ type harmless aluminum alloy refining ...

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Abstract

The invention discloses a method for eliminating the Portevin-Le Chatelier effect of an aluminum-magnesium alloy under the low strain rate condition. The method that comprises the following steps of heating industrial high-purity aluminum until the aluminum is molten, covering with a high-temperature covering agent, and heating; uniformly mixing KBF4 and K2TiF6 in proportion, drying, adding into the melt, and mechanically stirring; after finishing the reaction, taking out reaction byproducts, heating TiB2 / Al master batch obtained through cooling and casting to be molten and then continues to be heated, and adding a harmless aluminum alloy refining agent for deslagging and refining; controlling the temperature, sequentially adding the industrial high-purity aluminum and industrial high-purity magnesium, heating, removing slag, and mechanically stirring; adding a covering agent into the melt, conducting vacuumizing for 10min, and pouring the melt into a casting mold to form a casting blank; and carrying out one-way hot extrusion deformation on obtained in-situ synthesis TiB2 particle reinforced Al-Mg alloy composite material. According to the method, in-situ synthesized TiB2 nano ceramic particles are introduced into the aluminum-magnesium alloy, so that the Portevin-Le Chatelier effect of the aluminum-magnesium alloy at a low strain rate is eliminated.

Description

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

Claims

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Application Information

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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 JIAO TONG UNIV