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蠕變時效制度對回歸態(tài)Al-Zn-Mg-Cu合金析出相的影響
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中南大學(xué)輕合金研究院,中南大學(xué)機電工程學(xué)院

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國家自然科學(xué)基金項目（面上項目，重點項目，重大項目）;國家重點基礎(chǔ)研究發(fā)展計劃（973計劃）


Effect of stress-ageing treatments on precipitates of pre-retrogressed Al-Zn-Mg-Cu alloy
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Light Alloy Research Institute of Central South University,College of Mechanical and Electrical Engineering of Central South University

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    摘要:

    基于回歸再時效(RRA)工藝,提出一種新的回歸－應(yīng)力時效制度(RSA)用于Al-Zn-Mg-Cu合金。系統(tǒng)研究了應(yīng)力時效制度(時效時間和應(yīng)力)對回歸態(tài)Al-Zn-Mg-Cu合金析出相的影響。透射電鏡(TEM)觀察結(jié)果表明：在回歸處理后,合金內(nèi)部存在大量的基體析出相(MPts)和輕微不連續(xù)的晶界析出相(GBPs)。時效時間和應(yīng)力對回歸態(tài)合金析出相的影響十分顯著。隨著時間和應(yīng)力的增加,基體析出相的尺寸增加而密度減少；同時,晶界析出相的尺寸、間距和無沉淀的寬度也增加。相比于回歸再時效工藝,回歸-應(yīng)力時效工藝使得晶內(nèi)析出相尺寸增加,無沉淀析出帶變窄且晶界析出相更不連續(xù)。

    Abstract:

    According to retrogression and re-ageing treatment (RRA), a novel retrogression and stress-ageing treatment (RSA) is put forward for Al-Zn-Mg-Cu alloys. The effect of stress-ageing time and external stress on precipitates of pre-retrogressed Al-Zn-Mg-Cu alloy is investigated by transmission electron microscope (TEM). It is found that there is a large number of matrix precipitates (MPts) and slightly discontinuous grain boundary precipitates (GBPs) in the pre-retrogressed alloy. The effects of stress-ageing time and external stress on precipitates of the retrogressed alloy are significant. With the increase of stress-ageing time and external stress, the size of MPts increase and the density of MPts decreases. Meanwhile, the size of GBPs, the distance between GBPs and the width of precipitate free zone (PFZ) increase. Compared with the traditional retrogression and re-aging treatment, the retrogression and stress-ageing treatments increase the size of MPts, narrows the width of PFZ and discontinuous the GBPs of the studied Al-Zn-Mg-Cu alloy.

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徐永謙,湛利華.蠕變時效制度對回歸態(tài)Al-Zn-Mg-Cu合金析出相的影響[J].稀有金屬材料與工程,2017,46(2):355~362.[Xu Yongqian, Zhan Lihua. Effect of stress-ageing treatments on precipitates of pre-retrogressed Al-Zn-Mg-Cu alloy[J]. Rare Metal Materials and Engineering,2017,46(2):355~362.]
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  • 收稿日期:2016-04-25
  • 最后修改日期:2016-06-29
  • 錄用日期:2016-07-15
  • 在線發(fā)布日期: 2017-04-10
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