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Al-Mg5.0-Mn0.5鋁合金均勻化退火過程中Mg、Mn元素顯微偏析的DICTRA 模擬
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1.廣西大學(xué)資源環(huán)境與材料學(xué)院;2.廣西有色金屬及特色材料加工重點(diǎn)實(shí)驗(yàn)室;3.無;4.廣西柳州銀海鋁業(yè)有限公司

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基金項(xiàng)目:

National Natural Science Foundation of China (No. 51661004), Innovation Drive Development Foundation of Guangxi (GK AA17202011), Guangxi Natural Science Foundation (2018GXNSFAA050048, 2017GXNSFAA198271) and Guangxi Key Laboratory Project for Processing Non-ferrous Metals and Characteristic Materials (GXYSSF1809).


DICTRA? simulation of Mg and Mn Micro Segregations in a Al-Mg5.0-Mn0.5 Aluminum Alloy During Homogenized Annealing
Author:
Affiliation:

1.School of Resources,Environment and Materials,Guangxi University;2.Guangxi Key Laboratory of Processing for Non-ferrous Metal and Featured Materials, Guangxi University;3.Guangxi Liuzhou Yinhai Aluminum Co., Ltd ,Guangxi Liuzhou

Fund Project:

National Natural Science Foundation of China (No. 51661004), Innovation Drive Development Foundation of Guangxi (GK AA17202011), Guangxi Natural Science Foundation (2018GXNSFAA050048, 2017GXNSFAA198271) and Guangxi Key Laboratory Project for Processing Non-ferrous Metals and Characteristic Materials (GXYSSF1809).

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    摘要:

    基于DICTRA動(dòng)力學(xué)軟件的MOB2和Al基數(shù)據(jù)庫對(duì) Al-Mg5.0-Mn0.5鋁合金在470℃不同時(shí)間均勻化退火過程中Mg和Mn元素的顯微偏析情況進(jìn)行了模擬計(jì)算。采用了模擬結(jié)果與顯微組織觀察相結(jié)合的方法,并使用偏析因子來評(píng)價(jià)470℃不同時(shí)間均勻化退火過程中Mg和Mn元素的偏析程度。在470℃不同退火時(shí)間Mg和Mn元素的偏析因子有如下變化：退火8.3小時(shí)后,Mg的偏析因子約為0.94,接近1.0,而Mn的偏析因子在0.78~1.3之間；在退火11.1小時(shí)后,Mg的偏析因子約為1.0,表示Mg的濃度基本擴(kuò)散均勻,而Mn的偏析因子依然在0.78~1.3之間；退火27.8小時(shí)以后,Mn的偏析因子為0.8~1.3,與11.1小時(shí)相比只有微小的變化。根據(jù)計(jì)算結(jié)果,Mg引起的微觀偏析可通過均勻化退火消除,470oC下最少退火時(shí)間為11.1小時(shí)；而Mn引起的微觀偏析即使是470oC下退火保溫時(shí)間為27.8 ~30小時(shí)依然不能消除。這為Al-Mg5.0-Mn0.5鋁合金退火工藝的選擇提供了參考。

    Abstract:

    Micro segregation of Mg and Mn in a Al-Mg5.0-Mn0.5 aluminum alloy homogenized annealing at 470°C was evaluated by computational simulation in DICTRA? software, using MOB2 diffusion database and Al-based database. The segregation factor was used to predict the distribution of Mg and Mn at 470°C annealing temperature for different annealing time. Simulation results were compared with microstructure observations. After homogenizing at 470 oC for 8.3h, the segregation factor of Mg was about 0.94, close to 1.0; while, the segregation factor of Mn varied from 0.78 to 1.3. After homogenization annealing at 470 oC for 11.1h, the segregation factor of Mg was close to 1.0, and concentration of Mg was basically uniform, the range of segregation factor of Mn was almost unchanged. However, almost the same segregation factor of 0.8~1.3 was observed for Mn at the annealing temperature of 470 °C and annealing time of 27.8h. According to the DICTRA calculation results, after homogenizing at 470oC/11.1h, the micro-segregation of Mg was nearly eliminated. While the micro-segregation of Mn could not be eliminated, even if the annealing holding time extended to 27.8 h and 30h. This provides a reference for the selection of annealing process of Al-Mg5.0-Mn0.5 aluminum alloy.

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胡治流,李平珍,陸澤鵬,馬本莉,丁俊,趙艷君,唐鵬,黃前斌. Al-Mg5.0-Mn0.5鋁合金均勻化退火過程中Mg、Mn元素顯微偏析的DICTRA 模擬[J].稀有金屬材料與工程,2021,50(1):23~28.[Zhiliu Hu, Pingzhen Li, Zepeng Lu, Benli Ma, Jun Ding, Yanjun Zhao, Peng Tang, Qianbin Huang. DICTRA? simulation of Mg and Mn Micro Segregations in a Al-Mg5.0-Mn0.5 Aluminum Alloy During Homogenized Annealing[J]. Rare Metal Materials and Engineering,2021,50(1):23~28.]
DOI：10.12442/j. issn.1002-185X.20200350

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  • 收稿日期:2020-05-23
  • 最后修改日期:2020-07-31
  • 錄用日期:2020-08-04
  • 在線發(fā)布日期: 2021-02-05
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