17Al12相,平均尺寸約為200nm。因此,本研究獲得了屈服強(qiáng)度為463MPa和極限抗拉強(qiáng)度為527MPa的AZ91雙峰合金,這主要?dú)w功于雙峰組織以及細(xì)晶強(qiáng)化、析出強(qiáng)化和加工硬化的共同作用。"/>

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低溫慢速擠壓和電脈沖處理制備具有優(yōu)異力學(xué)性能的AZ91雙峰合金
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作者單位:

1.新材料界面科學(xué)與工程教育部重點(diǎn)實(shí)驗(yàn)室;2.萊斯特大學(xué)工程系

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基金項(xiàng)目:

國(guó)家自然科學(xué)基金項(xiàng)目（U1710118, U1810122, 51504162 and 51601123）；山西省高等學(xué)校優(yōu)秀創(chuàng)新團(tuán)隊(duì)（2018）；山西省自然科學(xué)基金（201801D221139）；中國(guó)山西省留學(xué)基金委（2016-029）


Exceptional mechanical properties of a bimodal AZ91 alloy prepared by low-temperature slow rate extrusion and electrical pulse treatment
Author:
Affiliation:

1.Key Laboratory of Interface Science and Engineering in Advanced Materials,Ministry of Education,Taiyuan University of Technology;2.Department of Engineering,University of Leicester,Leicester LE RH,UK

Fund Project:

National Natural Science Foundation of China (U1710118, U1810122, 51504162 and 51601123)； Outstanding Innovative Teams of Higher Learning Institutions of Shanxi (2018)； the Natural Science Foundation of Shanxi Province (201801D221139) ；Shanxi Scholarship Council of China (2016-029).

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    摘要:

    通過(guò)低溫慢速擠壓(LTSRE)和電脈沖處理(EPT)獲得具有雙峰結(jié)構(gòu)的AZ91鎂合金,這種結(jié)構(gòu)由粗大的尺寸約為20-60μm 的未再結(jié)晶晶粒和細(xì)小的尺寸約為200nm的再結(jié)晶晶粒組成。雙峰晶粒結(jié)構(gòu)的形成原因主要是LTSRE過(guò)程中的不均勻變形以及EPT對(duì)于變形AZ91鎂合金靜態(tài)再結(jié)晶的加速效應(yīng)。與常規(guī)熱處理時(shí)的靜態(tài)再結(jié)晶過(guò)程相比,EPT過(guò)程的再結(jié)晶溫度顯著降低,處理時(shí)間明顯縮短,有效抑制了再結(jié)晶晶粒的生長(zhǎng)。同時(shí)在EPT過(guò)程中析出了大量形狀規(guī)則的Mg17Al12相,平均尺寸約為200nm。因此,本研究獲得了屈服強(qiáng)度為463MPa和極限抗拉強(qiáng)度為527MPa的AZ91雙峰合金,這主要?dú)w功于雙峰組織以及細(xì)晶強(qiáng)化、析出強(qiáng)化和加工硬化的共同作用。

    Abstract:

    Low-temperature slow rate extrusion (LTSRE) and electrical pulse treatment (EPT) were carried out to obtain a bimodal microstructure in AZ91 Mg alloy, which consisted of coarse un-recrystallized grains of about 20-60μm and fine recrystallized grains of around 200nm. The bimodal grains can be contributed to the inhomogeneous deformation under LTSRE and the acceleration effect of the static recrystallization of the deformed AZ91 magnesium alloy under EPT. In addition, the growth of the recrystallized grains was effectively restrained due to the notably lower recrystallization temperature and shorter processing time compared with the conventional static recrystallization by heat treatment. Meanwhile, abundant Mg17Al12 phase with an average size of 200nm and regular shapes precipitated during EPT. Consequently, the exceptional yield strength of 463MPa and ultimate tensile strength of 527MPa were acquired in the bimodal AZ91 alloy, which can be primarily attributed to the bimodal microstructure as well as the combined effect of fine grain strengthening, precipitation strengthening and work hardening.

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武紅飛,樊建鋒,單召輝,張華,張強(qiáng),鄧?yán)だ?吳玉程,李衛(wèi)國(guó),董洪標(biāo),許并社.低溫慢速擠壓和電脈沖處理制備具有優(yōu)異力學(xué)性能的AZ91雙峰合金[J].稀有金屬材料與工程,2021,50(3):807~815.[Hongfei Wu, Jianfeng Fan, Zhaohui Shan, Hua Zhang, Qiang Zhang, Kunkun Deng, Yucheng Wu, Weiguo Li, Hongbiao Dong, Bingshe Xu. Exceptional mechanical properties of a bimodal AZ91 alloy prepared by low-temperature slow rate extrusion and electrical pulse treatment[J]. Rare Metal Materials and Engineering,2021,50(3):807~815.]
DOI：10.12442/j. issn.1002-185X.20200121

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  • 收稿日期:2020-02-25
  • 最后修改日期:2020-03-31
  • 錄用日期:2020-04-02
  • 在線發(fā)布日期: 2021-04-02
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