Er-containing casting heat-resistant Al-Si-Cu-Mg alloy

An al-si-cu-mg, alloy technology, applied in the field of Er-containing cast Al-Si aluminum alloy and its heat treatment process, can solve the problems of decreased mechanical properties of the alloy, reduction of dislocation pinning effect, etc., reaching room temperature and The effect of improved high temperature mechanical properties, good high temperature tensile properties, and excellent room temperature tensile properties

Active Publication Date: 2021-06-11
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Automobile cylinders and other parts need to serve at higher temperatures, and the strengthening phases formed by alloying elements Cu and Mg in Al-Si alloys, such as Al2Cu and Mg2Si, will grow rapidly or partially dissolve at temperatures above 200 °C. The reduction of the dislocation pinning effect leads to a significant decline in the mechanical properties of the alloy.

Method used

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  • Er-containing casting heat-resistant Al-Si-Cu-Mg alloy
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  • Er-containing casting heat-resistant Al-Si-Cu-Mg alloy

Examples

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Embodiment 1

[0017] Embodiment 1 (i.e. comparative example)

[0018] An Al-Si-Cu-Mg alloy containing Er, the mass percentage of the alloy is: Si: 6.61%, Cu: 0.10%, Mg: 0.59%, Er: 0.21%, Zr: 0.23%, Fe: 0.15% , the balance being Al.

[0019] Smelting is carried out in a laboratory resistance furnace, and after slag removal and stirring, the molten aluminum is poured into a metal mold to obtain an ingot; the ingot is subjected to solution treatment, and the specific solution treatment process is: the first-stage solution temperature is 280°C, Insulate for 3 hours; the second stage solid solution temperature is 530°C, hold for 3 hours, and quench in water at 30°C. Single-stage aging treatment is carried out on the alloy obtained by solution treatment, and the specific aging treatment process is as follows: the aging temperature is 170°C, the temperature is kept for 3 hours, and then air-cooled to room temperature. According to the GB / T228.1-2010 standard, room temperature and high temperatur...

Embodiment 2

[0021] The mass percentage of the alloy composition is: Si: 6.34wt.%, Cu: 0.68wt.%, Mg: 0.64wt.%, Er: 0.18wt.%, Zr: 0.16wt.%, Fe: 0.19%, and the balance is Al .

[0022] Referring to the smelting and casting method under the same conditions in Example 1, the ingot was subjected to solution treatment. The specific solution treatment process was: the first-stage solution temperature was 280° C., and the temperature was kept for 3 hours; the second-stage solution temperature was 500° C., Heat preservation for 4 hours; the third stage solid solution temperature is 540°C, heat preservation for 2 hours, and water quenching at 30°C. Single-stage aging treatment is carried out on the alloy obtained by solution treatment, and the specific aging treatment process is as follows: the aging temperature is 180°C, the temperature is kept for 10 hours, and then air-cooled to room temperature. Tensile tests at room temperature and 300°C were carried out on the alloy after heat treatment. The ...

Embodiment 4

[0026] The mass percentage of the alloy composition is: Si: 6.57wt.%, Cu: 1.11wt.%, Mg: 0.58wt.%, Er: 0.12wt.%, Zr: 0.14wt.%, Fe: 0.18%, and the balance is Al .

[0027] Referring to the smelting and casting method under the same conditions in Example 1, the ingot was subjected to solution treatment. The specific solution treatment process was: the first-stage solution temperature was 280° C., and the temperature was kept for 3 hours; the second-stage solution temperature was 500° C., Heat preservation for 4 hours; the third stage solid solution temperature is 540°C, heat preservation for 2 hours, and water quenching at 30°C. Aging treatment is carried out on the alloy obtained by solution treatment: the aging temperature is 180° C., the temperature is maintained for 12 hours, and then air-cooled to room temperature. Tensile tests at room temperature and 300°C were carried out on the alloy after heat treatment. The results of the room temperature tensile test are shown in Tab...

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Abstract

The invention discloses an Er-containing casting heat-resistant Al-Si-Cu-Mg alloy, and belongs to the field of nonferrous metal materials. The alloy has one characteristic that an Er element is added while the mass ratio of the alloy element in the Al-Si-Cu-Mg alloy is adjusted. According to a heat treatment process, three-stage solid solution treatment is adopted, the first-stage solid solution can enable the supersaturated Er element in the cast alloy to be separated out in the form of Al3Er, the size is 5-10nm, the second-stage solid solution can enable an intermetallic compound with a low melting point to be re-dissolved into a matrix on the premise of not overburning, and the third-stage solid solution can enable most coarse primary phases in the alloy to be re-dissolved into the matrix. Compared with the traditional single-stage solid solution, the three-stage solid solution has the advantage that the room-temperature and high-temperature mechanical properties of the Al-Si-Cu-Mg alloy are greatly improved. According to the alloy and the heat treatment process, the alloy has excellent room-temperature tensile property and good high-temperature tensile property.

Description

technical field [0001] The invention relates to an Er-containing cast Al-Si aluminum alloy with high room temperature strength and high heat resistance and a heat treatment process thereof, which can be used in the automobile industry and civilian fields, and belongs to the field of nonferrous metal materials. Background technique [0002] In recent years, with the development of the automobile, aerospace and automation industries, the performance requirements of alloy materials have become more stringent. For example, the design of automobile and automation industrial parts not only requires alloys to have high tensile strength and high yield strength at room temperature , and the requirements for tensile and yield strength at high temperatures are becoming more and more stringent. At present, the application of aluminum alloys in domestic and foreign markets has been widely popularized, but ordinary aluminum alloys can no longer meet the needs of the automotive and automat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/02C22C1/03C22F1/043
CPCC22C21/02C22C1/026C22C1/03C22F1/043
Inventor 黄晖代钊荣莉魏午高坤元文胜平吴晓蓝聂祚仁
Owner BEIJING UNIV OF TECH
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