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均勻化態(tài)Mg-Gd-Y-Zn-Mn合金熱變形行為及加工圖
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重慶大學(xué)國(guó)家鎂合金材料工程技術(shù)研究中心,重慶大學(xué)國(guó)家鎂合金材料工程技術(shù)研究中心,重慶大學(xué)材料學(xué)院,重慶大學(xué)國(guó)家鎂合金材料工程技術(shù)研究中心,重慶大學(xué)國(guó)家鎂合金材料工程技術(shù)研究中心,重慶大學(xué)國(guó)家鎂合金材料工程技術(shù)研究中心

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Hot deformation behavior and processing maps of as-homogenized Mg-Gd-Y-Zn-Mn alloy
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National Engineering Research Center for Magnesium Alloys, Chongqing University,National Engineering Research Center for Magnesium Alloys, Chongqing University,National Engineering Research Center for Magnesium Alloys, Chongqing University,National Engineering Research Center for Magnesium Alloys, Chongqing University,National Engineering Research Center for Magnesium Alloys, Chongqing University

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    摘要:

    通過(guò)溫度在350℃-500℃，應(yīng)變速率在0.001/s-1/s的熱壓縮實(shí)驗(yàn)，本文研究了均勻化態(tài)Mg-Gd-Y-Zn-Mn合金熱變形行為和加工圖。采用雙曲線(xiàn)模型，建立了本構(gòu)方程，計(jì)算了激活能為260.94kJ/mol?；趧?dòng)態(tài)材料模型，繪制了應(yīng)變量為0.6,1.2的均與化態(tài)Mg-Gd-Y-Zn-Mn合金的加工圖，用于研究材料的熱成性。應(yīng)變量1.2加工圖顯示適合合金加工的兩個(gè)安全區(qū)域：一個(gè)是變形溫度460℃-500℃，應(yīng)變速率0.001/s-1/s；另一個(gè)是變形溫度350℃-500℃，應(yīng)變速率0.001/s-0.005/s。同時(shí)，討論了相應(yīng)的微觀組織演變，重點(diǎn)關(guān)注了該合金中長(zhǎng)程堆垛有序相（LPSO）的變相機(jī)制。

    Abstract:

    The hot deformation behavior and processing maps of as-homogenized Mg-Gd-Y-Zn-Mn alloy were investigated by hot compression tests performed at 350-500°C and strain rates ranging from 0.001/ s to 1/ s . The constitutive equation was established using hyperbolic law, and the activation energy of the alloy was calculated to be about 260.94 kJ/mol. Based on the dynamic material model, processing maps of as-homogenized Mg-Gd-Y-Zn-Mn deformed at strain values of 0.6,1.2 were drawn to study the hot workability of the alloy. The processing map developed at a strain of 1.2 shows two safety domains: one occurring at 460–500°C and strain rates ranging from 0.001 /s to 1 /s; the other occurring at 350–500°C, and strain rate ranging from 0.001/s to 0.005/s. The corresponding microstructure evolutions, with particular emphasis on the deformation mechanism of long-period stacking ordered phase (LPSO) in this alloy, were also discussed.

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王敬豐,謝飛舟,劉世杰,黃崧,潘復(fù)生.均勻化態(tài)Mg-Gd-Y-Zn-Mn合金熱變形行為及加工圖[J].稀有金屬材料與工程,2018,47(6):1700~1707.[wangjingfeng, xiefeizhou, liushijie, huangsong, panfusheng. Hot deformation behavior and processing maps of as-homogenized Mg-Gd-Y-Zn-Mn alloy[J]. Rare Metal Materials and Engineering,2018,47(6):1700~1707.]
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  • 收稿日期:2016-06-16
  • 最后修改日期:2016-12-01
  • 錄用日期:2017-01-06
  • 在線(xiàn)發(fā)布日期: 2018-09-06
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