-1范圍的熱變形行為，建立了流變應(yīng)力本構(gòu)方程模型，繪制出了二維熱加工圖，確定了最佳熱加工區(qū)域，采用電子背散射衍射（EBSD）和透射電子顯微鏡（TEM）技術(shù)研究了該合金的組織演變規(guī)律。結(jié)果表明：ZL270LF鋁合金的流變應(yīng)力隨變形溫度的升高和應(yīng)變速率的降低而降低，熱變形激活能為309.05 kJ/mol，最優(yōu)熱加工區(qū)為溫度470~530 ℃、應(yīng)變速率為0.01~1 s-1。該合金在熱變形過程中存在3種不同的DRX機制，即連續(xù)動態(tài)再結(jié)晶（CDRX）、不連續(xù)動態(tài)再結(jié)晶（DDRX）和幾何動態(tài)再結(jié)晶（GDRX），其中CDRX是ZL270LF鋁合金動態(tài)再結(jié)晶的主要機制。"/>

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ZL270LF鋁合金的熱變形行為與組織演變
作者:
作者單位:

1.蘭州理工大學(xué) 材料科學(xué)與工程學(xué)院，甘肅 蘭州 730050;2.蘭州理工大學(xué) 省部共建有色金屬先進加工與再利用國家重點實驗室，甘肅 蘭州 730050

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基金項目:

國家自然科學(xué)基金項目[批準(zhǔn)號:52161006]甘肅省教育廳(2021CYZC-23)。甘肅省重點研發(fā)計劃項目(21YF5GD183和18YF1GA061)嘉峪關(guān)市科技規(guī)劃項目(21-10)中國博士后科學(xué)基金項目(2019M653896XB)


Hot Deformation Behavior and Microstructural Evolution of ZL270LF Aluminum Alloy
Author:
Affiliation:

1.School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China;2.State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China

Fund Project:

National Natural Science Foundation of China (52161006); Gansu Provincial Department of Education (2021CYZC-23); Gansu Key Research and Development Program (21YF5GD183, 18YF1GA061); Jiayuguan Science and Technology Planning Project (21-10); China Postdoctoral Science Foundation Project (2019M653896XB)

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    摘要:

    通過熱壓縮實驗研究了ZL270LF鋁合金在變形量為70%，溫度為300~550 ℃，應(yīng)變速率為 0.01~10 s-1范圍的熱變形行為，建立了流變應(yīng)力本構(gòu)方程模型，繪制出了二維熱加工圖，確定了最佳熱加工區(qū)域，采用電子背散射衍射（EBSD）和透射電子顯微鏡（TEM）技術(shù)研究了該合金的組織演變規(guī)律。結(jié)果表明：ZL270LF鋁合金的流變應(yīng)力隨變形溫度的升高和應(yīng)變速率的降低而降低，熱變形激活能為309.05 kJ/mol，最優(yōu)熱加工區(qū)為溫度470~530 ℃、應(yīng)變速率為0.01~1 s-1。該合金在熱變形過程中存在3種不同的DRX機制，即連續(xù)動態(tài)再結(jié)晶（CDRX）、不連續(xù)動態(tài)再結(jié)晶（DDRX）和幾何動態(tài)再結(jié)晶（GDRX），其中CDRX是ZL270LF鋁合金動態(tài)再結(jié)晶的主要機制。

    Abstract:

    The hot deformation behavior of ZL270LF aluminum alloy under a strain of 70%, deformation temperatures ranging from 300 °C to 550 °C, and strain rate ranging from 0.01 s-1 to 10 s-1 was studied by hot compression tests. A constitutive equation for flow stress was constructed, and the hot processing map was drawn, thus determining the optimal hot processing region. An electron back scattered diffractometer (EBSD) and a transmission electron microscope (TEM) were used to explore microstructural evolution of the alloy. The results show that the flow stress of ZL270LF Al alloy decreases with increasing deformation temperature and decreasing strain rate. The deformation activation energy is 309.05 kJ/mol, and the optimal processing region is the area where the temperature is from 470 °C to 530 °C and the strain rate is from 0.01 s-1 to 1 s-1. Three different dynamic recrystallization (DRX) mechanisms are involved in the hot deformation process of the alloy, namely continuous dynamic recrystallization (CDRX), discontinuous dynamic recrystallization (DDRX), and geometric dynamic recrystallization (GDRX). Among them, CDRX is the main DRX mechanism of ZL270LF Al alloy.

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丁萬武,陳世豪,胡立雯,張海霞,余海存,趙文軍.ZL270LF鋁合金的熱變形行為與組織演變[J].稀有金屬材料與工程,2023,52(12):4086~4098.[Ding Wanwu, Chen Shihao, Hu Liwen, Zhang Haixia, Yu Haicun, Zhao Wenjun. Hot Deformation Behavior and Microstructural Evolution of ZL270LF Aluminum Alloy[J]. Rare Metal Materials and Engineering,2023,52(12):4086~4098.]
DOI：10.12442/j. issn.1002-185X.20230311

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  • 收稿日期:2023-05-23
  • 最后修改日期:2023-11-16
  • 錄用日期:2023-07-28
  • 在線發(fā)布日期: 2023-12-25
  • 出版日期: 2023-12-22