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不同時效態(tài)7050鋁合金時效成形中析出相對應(yīng)力松弛行為的影響
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作者單位:

1.福建工程學(xué)院 材料科學(xué)與工程學(xué)院福州;2.福州大學(xué) 材料科學(xué)與工程學(xué)院福州

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基金項目:

(Nos. 51901044和51871057),福建省自然科學(xué)基金(Nos. 2019J01227和2017J01477),福建省新材料制備與成形技術(shù)重點(diǎn)實驗室開放基金(No. KF-C19003)


Effect of precipitates on stress relaxation behavior of 7050 Al alloy with different tempers during creep age-forming process
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1.School of Materials Science and Engineering,Fujian University of Technology;2.School of Materials Science and Engineering

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    摘要:

    鋁合金時效成形方法結(jié)合了合金的蠕變松弛和析出強(qiáng)化作用,作為一種先進(jìn)的整體壁板制造技術(shù)倍受航空制造業(yè)青睞。7xxx系鋁合金在時效成形過程中的應(yīng)力松弛行為受到合金內(nèi)析出相與位錯蠕變交互作用的影響從而制約著成形后零件質(zhì)量與性能。本文采用設(shè)計的應(yīng)力松弛試驗研究了不同時效態(tài)(固溶態(tài),欠時效態(tài)和峰時效態(tài))7050鋁合金內(nèi)析出相對時效成形過程中應(yīng)力松弛行為的影響,并通過位錯熱激活動力學(xué)參數(shù)計算和顯微組織表征分析析出相與位錯運(yùn)動的交互作用。結(jié)果表明時效成形過程中析出相對位錯熱激活運(yùn)動有明顯地阻礙作用,因此含有不同尺度析出相鋁合金的應(yīng)力松弛行為表現(xiàn)不同,隨著析出相尺度的增加合金應(yīng)力松弛速率減緩,應(yīng)力松弛極限增大。不同時效態(tài)7050鋁合金位錯激活體積計算和顯微組織表征結(jié)果都證明了應(yīng)力松弛過程中析出相增大對位錯運(yùn)動的阻礙作用也越顯著。峰時效態(tài)7050鋁合金的位錯激活體積最大,時效成形后塑性應(yīng)變的轉(zhuǎn)化率最低。此外,時效成形過程中,7050鋁合金內(nèi)析出相對位錯熱激活的阻礙作用引起了檻應(yīng)力現(xiàn)象,且隨著析出相的增大檻應(yīng)力也逐漸增大。

    Abstract:

    Creep age-forming combined creep and precipitation strengthening on aluminum alloy is an advanced integrated panel forming technology in the aerospace industry, and has been widely studied. The interaction between precipitation and dislocation creep in7xxx series aluminum alloy significantly affect on stress relaxation behavior, which decides the forming quality and properties of integrated panel, during age-forming process, since 7xxx series aluminum alloy as a typical age-hardening alloys. In this paper, the effect of different size precipitates on stress relaxation behavior of 7050 aluminum alloy during age-forming process has been investigated, which is helpful to apply creep age-forming technology of 7xxx series aluminum alloy with different tempers. The precipitates can obstruct dislocation thermal activation, therefore 7050 aluminum alloy with different size precipitates obviously exhibits different stress relaxation behavior, and relaxation rate decreases and relaxation limit increases with increasing precipitates size respectively. The calculation of dislocation activation volume and microstructure characterization proves that the obstruction to dislocation motion from precipitates improves with increasing precipitates size. Besides, a special threshold stress phenomena was present in the stress relaxation of the age-forming process, which was scribed to the interaction between precipitation and dislocation in 7050 aluminum alloy.

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鄒林池,程佳樂,王文龍,王晨,汪炳叔,陳俊鋒.不同時效態(tài)7050鋁合金時效成形中析出相對應(yīng)力松弛行為的影響[J].稀有金屬材料與工程,2021,50(11):4095~4102.[ZOU Linchi, CHENG Jiale, WANG Wenlong, WANG Chen, WANG Bingshu, CHEN Junfeng. Effect of precipitates on stress relaxation behavior of 7050 Al alloy with different tempers during creep age-forming process[J]. Rare Metal Materials and Engineering,2021,50(11):4095~4102.]
DOI：10.12442/j. issn.1002-185X.20200905

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  • 收稿日期:2020-11-23
  • 最后修改日期:2021-01-11
  • 錄用日期:2021-02-04
  • 在線發(fā)布日期: 2021-11-30
  • 出版日期: 2021-11-24