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均勻化退火對Al-6Mg-0.4Mn-0.15Zr-0.04Sc合金時(shí)效行為和微觀結(jié)構(gòu)影響
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材料科學(xué)與工程學(xué)院

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中圖分類號:

TG113.12

基金項(xiàng)目:

國家科技部重點(diǎn)研發(fā)項(xiàng)目(2016YFB0300801),國家自然科學(xué)基金(51621003,51671005)和北京市自然科學(xué)基金資助項(xiàng)目(2162006)


The Effect of Homogenization Treatment on Aging Behavior and Microstructure in Al-6Mg-0.4Mn-0.15Zr-0.04Sc Alloy
Author:
Affiliation:

College of Materials Science and Engineering,Key Laboratory of Advanced Functional Materials,Education Ministry of China,Beijing University of Technology

Fund Project:

National Key Research and Development Program of China (2016YFB0300801), National Natural Science Foundation of China (51671005 and 51621003) and Beijing Natural Science Foundation (2162006).

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    摘要:

    本文采用顯微硬度法，光學(xué)顯微鏡，掃描電鏡和透射電鏡探究了均勻化退火對Al-6Mg-0.4Mn-0.15Zr-0.04Sc合金Al3(Sc,Zr)相時(shí)效行為和Mg均勻性的影響。顯微硬度結(jié)果顯示，合金直接在Al-Mg合金的均勻化溫度475℃單級退火時(shí)，峰值硬度為83HV，遠(yuǎn)低于等時(shí)退火時(shí)的峰值硬度92HV，表明單級均勻化退火時(shí)Al3(Sc,Zr)時(shí)效強(qiáng)化效果沒有充分發(fā)揮。因此設(shè)計(jì)雙級均勻化退火，第一級退火在275-350℃進(jìn)行，使得Al3Sc相彌散析出，300℃具有最高的硬度峰值87HV，之后進(jìn)行475℃第二級退火，使得Zr包裹在Al3Sc相長大，硬度進(jìn)一步上升至92HV。微觀結(jié)構(gòu)分析顯示雙級退火相比于單級退火球形Al3(Sc,Zr)相更為細(xì)小彌散，因此具有更高的強(qiáng)化效果。合金經(jīng)過300℃/7h+475℃/15h雙級退火后，不僅枝晶處Mg的偏析完全消除，而且Al3(Sc,Zr)相可以細(xì)小彌散析出，從獲得了更高強(qiáng)度和再結(jié)晶溫度。

    Abstract:

    The effect of homogenization treatment on aging behavior of Al3(Sc,Zr) and homogeneity of Mg were studied in an Al-6Mg-0.4Mn-0.15Zr-0.04Sc alloy using Micro-hardness test, optical microscope, scanning electron microscope and transmission electron microscope. The peak hardness of alloy annealing at the normal homogeneous temperature of 475℃ was 83HV, much lower than those isochronally annealed at 175-550℃, demonstrated that the alloy did not obtained the sufficient aging strengthening from Al3(Sc,Zr) particle during one-stage annealing at 475℃. Therefore, two-stage homogeneous treatment was designed. The first stage annealing was selected from 275-350℃, where the 300℃ exhibited the highest peak hardness of 87HV, and the second-stage annealing were performed at 475℃ with the peak hardness of 92HV. The microstructure analyses indicated the Al3(Sc,Zr) particles in two-stage annealing were much finer than that of one step annealing. After annealing at 300℃/7h+475℃/15h, the segregation of Mg disappeared and the Al3(Sc,Zr) particles formed dispersedly at the same time.

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引用本文

丁宇升,高坤元,郭姍姍,黃暉,文勝平,吳曉藍(lán),聶祚仁.均勻化退火對Al-6Mg-0.4Mn-0.15Zr-0.04Sc合金時(shí)效行為和微觀結(jié)構(gòu)影響[J].稀有金屬材料與工程,2020,49(5):1803~1809.[Ding Yusheng, Gao Kunyuan, Guo shanshan, Huang Hui, Wen Shengping, Wu Xiaolan, Nie Zuoren. The Effect of Homogenization Treatment on Aging Behavior and Microstructure in Al-6Mg-0.4Mn-0.15Zr-0.04Sc Alloy[J]. Rare Metal Materials and Engineering,2020,49(5):1803~1809.]
DOI：10.12442/j. issn.1002-185X.20190283

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  • 收稿日期:2019-04-02
  • 最后修改日期:2019-05-05
  • 錄用日期:2019-05-15
  • 在線發(fā)布日期: 2020-06-05
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