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Aging strengthening type magnesium alloy and heat treatment process thereof

An ageing strengthening, magnesium alloy technology, applied in the field of magnesium alloy materials and processing technology, ageing strengthening magnesium alloy and its heat treatment technology, can solve the limitation of alloy strength improvement effect, hinder the basal plane dislocation slip, and the limited effect of aging strengthening and other problems to achieve the effect of reducing adverse effects, increasing solid solubility, and improving plasticity

Active Publication Date: 2015-08-12
CHONGQING UNIV
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Problems solved by technology

[0003] However, in Mg-Zn alloys, the aging strengthening phase MgZn 2 Precipitation along the basal plane of the magnesium matrix cannot effectively hinder the dislocation slip on the basal plane, so the aging strengthening effect is limited, which limits the effect of improving the strength of the alloy; moreover, the alloy is added with the noble metal element Zr as a grain refiner, although Its content is not high (≥0.45wt%), but it increases the alloy cost to a certain extent
In the Mg-RE alloy system with rare earth as the main additive element, although the rare earth strengthening phase has a good strengthening effect; however, due to the high price of rare earth, this type of alloy is only used in aerospace and other fields, which limits the scope of use of the alloy

Method used

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  • Aging strengthening type magnesium alloy and heat treatment process thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: An aging-strengthened magnesium alloy, the weight percentage of each component in the magnesium alloy is 8.0% zinc, 1.5% copper, 1.0% manganese, and the rest is magnesium and unavoidable impurities.

[0023] The aging-strengthened magnesium alloy of the present invention is produced by the following preparation process: using industrial pure magnesium ingots, industrial pure zinc ingots, Mg-10%Mn master alloys, and Mg-30%Cu master alloys as raw materials, using a semi-continuous casting method Smelting and casting.

[0024] Heat to 720°C in a resistance crucible furnace to melt industrial pure magnesium, keep it warm for 5 minutes, remove slag, then raise the temperature to 760°C, add Mg-10%Mn master alloy, Mg-30%Cu master alloy and industrial pure zinc, when all melted Finally, let it stand for 15 minutes, add hexachloroethane refining agent after breaking the slag, refine for 3-5 minutes, let it stand for 15 minutes after breaking the slag, and then cool...

Embodiment 2

[0031] Embodiment 2: An aging-strengthened magnesium alloy, the weight percentage of each component in the magnesium alloy is zinc 7.3%, copper 1.0%, manganese 0.8%, and the rest is magnesium and unavoidable impurities. Prepared by the same preparation process as in Example 1.

[0032] 1) The cast ingot obtained by pouring is sawed and cut into wagons, and then two-stage homogenization treatment is carried out at 330°C×8h+400°C×20h;

[0033] 2) Hot extrusion at 360°C, with an extrusion ratio of 25, to obtain a Ф16 alloy rod;

[0034] 3) Perform solution aging heat treatment on the rod obtained by thermoforming, in which the solution treatment is kept at 400°C for 4 hours,

[0035] 4) Water cooling, followed by two-stage aging, the process parameters are 80℃×5h+175℃×18h.

[0036] The tensile mechanical properties of the alloy bars after solution treatment and solution aging treatment were tested, and the yield strengths were 225 and 387 MPa, respectively, and the strength inc...

Embodiment 3

[0037] Embodiment 3: An age-strengthened magnesium alloy, the weight percentage of each component in the magnesium alloy is 6.8% zinc, 0.9% copper, 1.2% manganese, and the rest is magnesium and unavoidable impurities. Prepared by the same preparation process as in Example 1.

[0038] 1) The cast ingot obtained by pouring is sawed and cut into wagons, and then two-stage homogenization treatment is carried out at 360°C×4h+410°C×18h;

[0039] 2) Hot extrusion at 400°C, with an extrusion ratio of 25, to obtain a Ф16 alloy rod;

[0040] 3) Perform solution aging heat treatment on the rod obtained by thermoforming, wherein the solution treatment is kept at 430°C for 3 hours;

[0041] 4) Water cooling, followed by two-stage aging, the process parameters are 100℃×3h+185℃×15h.

[0042] The tensile mechanical properties of the alloy bars after solution treatment and solution aging treatment were tested, and the yield strengths were 211 and 380 MPa, respectively, and the strength incre...

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Abstract

The invention provides an aging strengthening type magnesium alloy and a heat treatment process thereof. The alloy comprises, by weight, 6.8-8.0% of zinc, 0.8-1.5% of copper and 0.8-1.5% of manganese, with the balance being magnesium and inevitable impurities. According to the heat treatment process, an alloy ingot is subjected to two-stage homogenization treatment under the condition of (330-360) DEG C * (4-8)h+(400-420) DEG C * (16-20)h and is subjected to thermal forming at the temperature of 360-400 DEG C, a finished product is subjected to solution treatment at the temperature of 400-430 DEG C for 2-4 hours, and two-stage aging is performed under the condition of (80-100) DEG C * (3-5)h+(175-190) DEG C * (15-18)h after water cooling, so that an aging strengthening effect much better than that of a commercial high-strength ZK60 alloy can be achieved, and alloy strength can be improved obviously. The alloy does not contain heavy metal and is low in cost; the limitation that aging strengthening of conventional commercial magnesium alloys is achieved through MgZn2 phases is broken through; through proper heat treatment process, precipitated phases in the alloy can be precipitated in a small dispersed mode and the ageing strengthening potential of the alloy can be developed to the greatest extent.

Description

technical field [0001] The invention relates to a magnesium alloy material and a treatment process, in particular to an aging-strengthened magnesium alloy and a heat treatment process thereof. It belongs to the technical field of metal materials. Background technique [0002] Magnesium is by far the lightest commercial metal structural material, showing great application potential in 3C, aerospace, transportation and other fields. However, the development and application of magnesium alloys is far behind that of light metal aluminum. One of the main reasons is that the absolute strength of magnesium is insufficient. Aging strengthening is an effective means of strengthening metal materials, which can greatly improve the strength of metal materials. The current commercial high-strength magnesium alloys include Mg-Zn-Zr series (typical alloy ZK60) and Mg-RE series (typical alloy WE43), and the means of strengthening magnesium is aging strengthening. [0003] However, in M...

Claims

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Application Information

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IPC IPC(8): C22C23/04C22C1/03C22F1/06
Inventor 张静魏新黄浩邱斌
Owner CHONGQING UNIV
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