Heat treatment process for Al-Mg-Mn-Er-Zr alloy
A technology of alloy and process, applied in the field of heat treatment strengthening process, can solve the problems of weakening strengthening mechanism, weakening strengthening effect, weakening work hardening effect, etc., and achieve the effect of improving heat resistance and mechanical properties
Active Publication Date: 2011-07-27
BEIJING UNIV OF TECH
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[0002] Literature survey shows ("Handbook of Aluminum Alloys and Its Processing", Central South University Press, 2005, 292 pages), the strengthening mechanism of traditional Al-Mg alloys (5××× aluminum alloys) is mainly fine grain strengthening, Mg Solid solution strengthening and work hardening of atoms, etc., the strengthening effect of the above strengthening mechanism is weakened at high temperature, such as fine grains will be coarsened at higher temperature; the diffusion of Mg atoms is accelerated at high temperature, and the effect of solid solution strengthening is weakened; deformation processing forms The dislocations are easy to slip at high temperature, which weakens the work hardening effect
Traditional Al-Mg alloys lack effective second-phase strengthening, and heat treatment cannot strengthen the alloy. Heat treatment will only weaken the existing strengthening mechanism and reduce the mechanical properties of Al-Mg alloys.
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[0023] 1) Melting Al-Mg-Mn-Er-Zr alloy at 720-740°C, the content of Mg in the alloy is 4.5wt%, the content of Mn is 0.7wt%, the content of Er is 0.3wt%, and the content of Zr is 0.1wt%, The total content of impurity elements in the alloy is less than 1wt%, and the balance is Al, and the alloy elements are melted and stirred to make the components of each element in the melt evenly distributed, and finally the alloy ingot is cast by using a water-cooled mold;
[0024] 2) Perform single-stage heat treatment on the alloy ingot obtained in step 1), heat the alloy ingot at 430-510°C for 4-20 hours, and conduct a total of 15 experiments, taking samples in different heat treatment states to test the hardness, using HV-5 A small load Vickers hardness tester was used to test the Vickers hardness of the samples before and after heat treatment, the test load was 1Kgf, and the loading time was 15s. The results are shown in Table 1.
[0025]
[0026] Table 1
[0027] Vickers hardness o...
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The invention relates to a heat treatment process of Al-Mg-Mn-Er-Zr alloy and belongs to the technical field of metal alloy. The invention aims at providing a single-stage and double-stage heat treatment processes of an AL-4.5Mg-0.7Mn-0.1Zr-0.3Er alloy cast ingot, wherein the single-stage heat treatment process comprises the following steps: the alloy cast ingot is insulated for 4-20 hours at thetemperature of 430-510 DEG C, wherein the optimization is to insulate the alloy cast ingot for 16 hours at the temperature of 470 DEG C; and the double-stage heat treatment process comprises the following steps: the alloy cast ingot is firstly insulated for 4-12 hours at the temperature of 250-310 DEG C and is then insulated for 4-20 hours at the temperature of 430-510 DEG C, wherein the optimization is to insulate the alloy cast ingot for 8 hours at the temperature of 280 DEG C and then for 12 hours at the temperature of 470 DEG C. The invention promotes the precipitation and the growth of strengthening phases, such as Al3Er, Al6Mn, and the like in the alloy, improves the mechanical property of the alloy and also facilitates improving the heat-resistant performance of aluminum alloy due to the strengthening phases formed due to high temperature.
Description
technical field [0001] The invention belongs to the technical field of metal alloys, and in particular relates to a heat treatment strengthening process for Al-Mg-Mn-Er-Zr alloys. Background technique [0002] Literature survey shows ("Handbook of Aluminum Alloys and Its Processing", Central South University Press, 2005, 292 pages), the strengthening mechanism of traditional Al-Mg alloys (5××× aluminum alloys) is mainly fine grain strengthening, Mg Solid solution strengthening and work hardening of atoms, etc., the strengthening effect of the above strengthening mechanism is weakened at high temperature, such as fine grains will be coarsened at higher temperature; the diffusion of Mg atoms is accelerated at high temperature, and the effect of solid solution strengthening is weakened; deformation processing forms The dislocations are easy to slip at high temperature, which weakens the work hardening effect. Traditional Al-Mg alloys lack effective second-phase strengthening, ...
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IPC IPC(8): C22F1/047
Inventor 黄晖聂祚仁苏学宽林双平刘永刚左铁镛
Owner BEIJING UNIV OF TECH