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A kind of al-mg-er-zr heat-resistant aluminum alloy and its preparation process

An al-mg-er-zr and preparation process technology, applied in the field of metal alloys, can solve the problems of insignificant alloy microalloying effect, high annealing temperature, unfavorable strengthening, etc., so as to suppress the recrystallization process and increase the recrystallization temperature. Effect

Active Publication Date: 2016-07-06
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, under this conventional annealing process, due to the high annealing temperature, it is not conducive to the formation of fine and dispersed strengthening phases, so that the microalloying effect of the alloy is not significant

Method used

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  • A kind of al-mg-er-zr heat-resistant aluminum alloy and its preparation process
  • A kind of al-mg-er-zr heat-resistant aluminum alloy and its preparation process
  • A kind of al-mg-er-zr heat-resistant aluminum alloy and its preparation process

Examples

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Effect test

example 1

[0020] Example 1: An alloy ingot was prepared by smelting in a graphite crucible and casting in an iron mold, and the raw materials used were pure aluminum, pure magnesium, and master alloys of Al-6Er and Al-4Zr. At a melting temperature of 770±10°C, first melt the aluminum ingot, then add Al-Er and Al-Zr master alloys, add pure magnesium after the master alloy is melted, and add hexachloroethane to degas after the pure magnesium is melted. Stir, keep warm and stand for 10 minutes to make the components of each element in the melt evenly distributed before iron mold casting. Four Al-Mg-Er-Zr alloys with different compositions were prepared, and their actual compositions were measured by XRF, as shown in Table 1 below.

[0021] Table 1 Experimental alloy composition

[0022]

example 2

[0023] Example 2: The alloy in Example 1 is subjected to isochronous annealing treatment at 150-550° C., and the same is taken every 25° C. figure 1 The Vickers hardness of the alloys at different temperatures is given. It can be seen from the figure that the hardness of alloys A1, A2, and A3 all reach the peak at about 475 ° C, while the hardness value of Al-Mg alloy A4 is in the whole isochronous annealing process. basically unchanged. This shows that adding Er and Zr composite microalloying alloy has a very significant strengthening effect in the annealing process. In addition, it can be seen that as the magnesium content increases, the hardness value of the as-cast alloy also increases sequentially, and the increase in the hardness value during the annealing process increases accordingly with the increase of the magnesium content. For example, the peak hardness of the A1 alloy is higher than that of the as-cast alloy The alloy is 10Hv higher, the peak hardness of the A2 a...

example 3

[0024] Example 3: The alloy in Example 1 was subjected to isochronous annealing treatment at 150-475° C., then cold rolled on a rolling mill with a total deformation of 80%, and then recrystallization annealing treatment was performed on the cold rolled alloy. Such as figure 2 The recrystallization annealing hardness change curve of the alloy is given, image 3 The metallographic photographs of the alloy after recrystallization annealing are given. From image 3 In (a), it can be seen that the A1 alloy has not started to recrystallize after recrystallization annealing at 450 °C; image 3 In (b), it can be seen that the A2 alloy has begun to partially recrystallize after recrystallization annealing at 400 °C; image 3 In (c), it can be seen that the A3 alloy has also begun to partially recrystallize after recrystallization annealing at 375 °C; image 3 In (d), it can be seen that the A4 alloy has been completely recrystallized after recrystallization annealing at 325 °C. ...

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Abstract

Al-Mg-Er-Zr heat-resistant aluminum alloy and its preparation technology belong to the technical field of alloy. The alloy is obtained by adding 1.1-5.1 wt% of Mg, 0.25-0.35 wt% of Er and 0.25-0.3 wt% of Zr into an aluminium matrix. The percentage is weight percentage of each component in the Al-Mg-Er-Zr heat-resistant aluminum alloy. The preparation technology comprises the following steps: smelting Al-Mg-Er-Zr alloy at 760-780 DEG C, stirring after each alloy element is smelted, casting to obtain as-cast alloy, isochronally annealing the alloy every 25 DEG C between 150-475 DEG C for 3 hours, and carrying out cold rolling on the annealed alloy by a cold-rolling mill. Total deformation of cold rolling is 60-80%. A lot of Al3 (Er,Zr) strengthening phase particles are separated out, and the hardening effect is remarkable during the annealing process. When an alloy cold-rolled sheet is used at high temperature, the strengthening phase particles can impede alloy dislocation and grain and sub-grain boundary migration and merging and inhibit recrystallization process of the alloy. Recrystallization temperature of the alloy is raised.

Description

technical field [0001] The invention relates to a composite microalloyed aluminum alloy material and a preparation process thereof, belonging to the technical field of metal alloys. Background technique [0002] Al-Mg alloys are widely used in aerospace, marine and automotive industries due to their excellent corrosion resistance, weldability, moderate strength and good formability. However, the Al-Mg alloy is an alloy that cannot be strengthened by heat treatment, and its strength mainly depends on the Mg content and the degree of deformation strengthening. The increase of Mg content makes the forming of the alloy difficult, so the method of deformation strengthening is often used, and the deformation strengthening state alloy will appear "softening" with the increase of temperature and the extension of time. Adding a small amount of strengthening elements is an effective method to stabilize the properties of the alloy. Studies have found that adding a small amount of Sc c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/06C22C1/03C22F1/047
CPCC22C1/026C22C1/03C22C21/06C22F1/047
Inventor 王为赵万辉文胜平聂祚仁高坤元黄晖
Owner BEIJING UNIV OF TECH
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