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非等溫蠕變時效對Al-Zn-Mg-Cu合金力學性能和耐腐蝕性能的影響
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1.華南理工大學 廣東省金屬新材料制備與成形重點實驗室，廣東 廣州 510640;2.華南理工大學 國家金屬材料近凈成形工程技術研究中心，廣東 廣州 510640;3.中國航空制造技術研究院，北京 100024

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基金項目:

Core Technology Research Project of Foshan City (No. 1920001000412); National Defense Basic Scientific Research Program (No. JCKY2018205B024).


Effect of Nonisothermal Creep Aging on Mechanical Properties and Corrosion Resistance of Al-Zn-Mg-Cu Alloy
Author:
Affiliation:

1.Guangdong Key Laboratory for Advanced Metallic Materials Fabrication and Forming, South China University of Technology, Guangzhou 510640, China;2.National Engineering Research Center of Near-Net-Shape Forming for Metallic Materials, South China University of Technology, Guangzhou 510640, China;3.AVIC Manufacturing Technology Institute, Beijing 100024, China

Fund Project:

Core Technology Research Project of Foshan City (1920001000412); National Defense Basic Scientific Research Program (JCKY2018205B024)

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    摘要:

    研究了非等溫蠕變時效處理中升溫速率和峰值溫度對Al-Zn-Mg-Cu合金回彈性能、力學性能和耐腐蝕性能的影響。通過透射電鏡分析了合金的析出行為和時效強化機理。結果表明：隨著加熱速率的降低和峰值溫度的升高，合金的回彈率降低；晶內析出相的尺寸增大，而體積分數(shù)先增大后減??；晶界析出相逐漸變得不連續(xù)，無析出區(qū)擴大。經非等溫蠕變時效（20 ℃/h，180 ℃）處理后的合金主要析出相為致密的η'相，晶界析出相不連續(xù)，無析出區(qū)的寬度約為44.2 nm。非等溫蠕變時效（20 ℃/h，180 ℃）處理的合金力學性能和耐腐蝕性能均優(yōu)于常見的等溫蠕變時效（120 ℃，24 h）處理的合金，并且時效時間縮短了67%。

    Abstract:

    The effects of the heating rate and peak temperature on the springback, mechanical properties, and corrosion resistance of Al-Zn-Mg-Cu alloy were investigated. The precipitation behavior and aging strengthening mechanism of the alloy were analyzed by transmission electron microscope. Results show that with decreasing the heating rate and increasing the peak temperature, the springback of the alloy is decreased; the size of intragranular precipitates is increased; the volume fraction of intragranular precipitates is firstly increased and then decreased; the grain boundary precipitates become discontinuous and the precipitate-free zone is expanded. After nonisothermal creep aging (NICA) treatment (20 °C/h, 180 °C), the main precipitates of alloy are compact η' phase, the grain boundary precipitates are discontinuous, and the free zone width is approximately 44.2 nm. The mechanical properties and corrosion resistance of the alloy treated by NICA (20 °C/h, 180 °C) are better than those of the alloy treated by common isothermal creep aging (120 °C, 24 h), and the aging time is shortened by 67%.

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王令姣,李小強,潘存良,朱德智,屈盛官,黃遐.非等溫蠕變時效對Al-Zn-Mg-Cu合金力學性能和耐腐蝕性能的影響[J].稀有金屬材料與工程,2023,52(3):867~875.[Wang Lingjiao, Li Xiaoqiang, Pan Cunliang, Zhu Dezhi, Qu Shengguan, Huang Xia. Effect of Nonisothermal Creep Aging on Mechanical Properties and Corrosion Resistance of Al-Zn-Mg-Cu Alloy[J]. Rare Metal Materials and Engineering,2023,52(3):867~875.]
DOI：10.12442/j. issn.1002-185X.20220474

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  • 收稿日期:2022-05-31
  • 最后修改日期:2022-08-31
  • 錄用日期:2022-09-27
  • 在線發(fā)布日期: 2023-03-31
  • 出版日期: 2023-03-24