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Method for improving strength of (Ce + Yb) composite modified hypoeutectic Al-Si-Mg-Cu-Cr alloy

A technology of al-si-mg-cu-cr and compound modification, which is applied in the field of improving the strength of compound modified hypoeutectic Al-Si-Mg-Cu-Cr alloy, can solve the problem that synergy cannot be fully exerted, strength, Problems such as limited improvement of plasticity

Active Publication Date: 2022-04-19
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Hypoeutectic Al-Si-Mg-Cu-Cr alloy under (Ce+Yb) composite modification is an Al-Si alloy, the addition of Ce and Yb is expected to effectively improve its mechanical properties such as strength and plasticity, but Using the conventional preparation process, its strength and plasticity are limited, and the effects of Ce and Yb, especially the synergistic effect with other alloying elements, cannot be fully exerted.

Method used

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  • Method for improving strength of (Ce + Yb) composite modified hypoeutectic Al-Si-Mg-Cu-Cr alloy
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  • Method for improving strength of (Ce + Yb) composite modified hypoeutectic Al-Si-Mg-Cu-Cr alloy

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Effect test

Embodiment 1

[0035] step one:.

[0036] Carry out solid solution treatment with Al-6Si-0.6Mg-0.6Cu-0.2Cr-0.2Ce-0.2Yb (wt.%) as-cast alloy cylindrical sample in electric resistance furnace, take out after solid solution time (stay in air Time ≤ 10s) Quenching with warm water at 60°C;

[0037] Step two:

[0038] The interval time does not exceed 24 hours, and the solid solution alloy sample is subjected to high-temperature compression and thermal deformation on a hydraulic press that can control the strain rate until the deformation reaches the set deformation amount, and immediately cools down with room temperature water to retain the thermally deformed structure;

[0039] Step three:

[0040] The interval time does not exceed 12h, and the high-temperature compression heat-deformation alloy sample is subjected to aging treatment in a resistance furnace, and after the aging time is up, it is taken out and air-cooled.

[0041] The alloy sample after the "solid solution-high temperature com...

Embodiment 2

[0043] Step 1, Step 2 and Step 3 in this embodiment are the same as those in Embodiment 1, except that the process parameters of "solid solution-high temperature compression thermal deformation-aging" treatment are different, as shown in Table 1. The alloy sample after the "solid solution-high temperature compression thermal deformation-aging" treatment was tested for tensile properties at room temperature, and the results were: the ultimate tensile strength of the alloy in this example was 353.1 MPa, and the uniform elongation was 14.3%. In this embodiment, the strength of the alloy is increased by 9.2%, and the elongation is increased by 134.4%.

Embodiment 3

[0045] Step 1, Step 2 and Step 3 in this embodiment are the same as those in Embodiment 1, except that the process parameters of "solid solution-high temperature compression thermal deformation-aging" treatment are different, as shown in Table 1. The alloy sample after the "solid solution-high temperature compression thermal deformation-aging" treatment was tested for tensile properties at room temperature, and the results were: the ultimate tensile strength of the alloy in this example was 346.3 MPa, and the uniform elongation was 13.4%. In this embodiment, the strength of the alloy is increased by 7.1%, and the elongation is increased by 119.7%.

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Abstract

The invention discloses a method for improving the strength of a (Ce + Yb) composite modified hypoeutectic Al-Si-Mg-Cu-Cr alloy, which is characterized in that on the basis of the (Ce + Yb) composite modified hypoeutectic Al-Si-Mg-Cu-Cr alloy, after the alloy is smelted and cast by adopting a gravity casting method, the alloy is firstly subjected to high-temperature solution treatment, then is subjected to high-temperature heat treatment, and finally is subjected to high-temperature heat treatment, so that the strength of the (Ce + Yb) composite modified hypoeutectic Al-Si-Mg-Cu-Cr alloy is improved. Secondly, carrying out high-temperature compression thermal deformation treatment at a constant temperature and a constant strain rate; and finally, carrying out aging treatment. According to the method, the strength of the alloy can be further improved, meanwhile, the plasticity of the alloy is improved more obviously, the comprehensive mechanical property of the alloy is excellent, the application range of the alloy is widened, and the method is easy and convenient to operate, high in feasibility and remarkable in effect.

Description

technical field [0001] The invention relates to a method for improving the strength of (Ce+Yb) composite modified hypoeutectic Al-Si-Mg-Cu-Cr alloy, which belongs to the technical field of aluminum alloy strengthening modification. Background technique [0002] Aluminum alloy material is the most common non-ferrous metal component material. Its high strength and light weight make it an outstanding contribution to transportation, construction, aerospace and other industries. Especially in the current rapid development trend of the automobile industry, aluminum alloy materials, as one of the very light metal materials, have broad application prospects before replacing the cast iron pistons, body shells, wheels, cylinder heads and other components that have been used before. . [0003] Among the aluminum alloys, there are the most varieties and the most used alloys are cast hypoeutectic Al-Si alloys. Because of their high specific strength and good casting performance, they ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/043C22C21/02
CPCC22F1/043C22C21/02C22F1/002
Inventor 杜晓东邱明坤陈畅孙建吴玉程
Owner HEFEI UNIV OF TECH
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