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經(jīng)電脈沖處理的軋制AZ31鎂合金組織與性能演變
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新材料界面科學與工程教育部重點實驗室 太原理工大學,新材料界面科學與工程教育部重點實驗室 太原理工大學,新材料界面科學與工程教育部重點實驗室 太原理工大學,新材料界面科學與工程教育部重點實驗室 太原理工大學,新材料界面科學與工程教育部重點實驗室 太原理工大學,新材料界面科學與工程教育部重點實驗室 太原理工大學,新材料界面科學與工程教育部重點實驗室 太原理工大學,新材料界面科學與工程教育部重點實驗室 太原理工大學

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國家自然科學基金(51504162, 50901048, 51174143)；教育部新世紀優(yōu)秀人才支持計劃(NCET-12-1040 )；山西省自然科學基金(2015011033, 2015021073 )；教育部科學技術(shù)研究重點項目(2012017 )；山西省高等學?？萍紕?chuàng)新項目(2014118). 山西省留學人員科技活動擇優(yōu)資助項目；太原理工大學2014年校專項/青年基金(2014TD016 )


Microstructure and mechanical properties of rolled AZ31 alloy sheets processed by electropulsing treatment
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Key Laboratory of Interface Science and Engineering in Advanced Materials,Ministry of Education,Taiyuan University of Technology,Key Laboratory of Interface Science and Engineering in Advanced Materials,Ministry of Education,Taiyuan University of Technology,Key Laboratory of Interface Science and Engineering in Advanced Materials,Ministry of Education,Taiyuan University of Technology,Key Laboratory of Interface Science and Engineering in Advanced Materials,Ministry of Education,Taiyuan University of Technology,,,Key Laboratory of Interface Science and Engineering in Advanced Materials,Ministry of Education,Taiyuan University of Technology,Key Laboratory of Interface Science and Engineering in Advanced Materials,Ministry of Education,Taiyuan University of Technology

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    摘要:

    電脈沖處理是一種改善合金顯微組織、提高金屬材料綜合力學性能的新型處理方法。本文利用超景深顯微鏡、掃描電鏡(SEM)、電子背散射衍射(EBSD)研究了高能量脈沖電流對10%、15%、20%不同軋制變形量AZ31鎂合金組織演化與力學性能的影響。當變形量為20%的軋制板材經(jīng)電流密度為4.16×109 A/m2、脈寬為30us、頻率為100Hz的脈沖電流處理10min后,平均晶粒尺寸由150um細化至20um,抗拉強度提升至265MPa,伸長率可達19.7%。同時,分析了此實驗參數(shù)下電脈沖處理過程中熱效應(yīng)與非熱效應(yīng)對再結(jié)晶的影響,發(fā)現(xiàn)熱效應(yīng)在再結(jié)晶過程中占主導(dǎo)作用,并揭示了非熱效應(yīng)的作用機理。

    Abstract:

    Electropulsing treatment (EPT) is a new method to refine the microstructure and improve the mechanical properties of metal materials. In the present paper, the microstructure evolution of rolled AZ31 alloy sheets with 10%, 15% and 20% rolling reduction were investigated by VHX-2000 optical microscope and scanning electron microscope equipped with electron backscattered diffraction (EBSD). After EPT with a pluse-width of 30 μs, a current density of 4.16×109 A/m2, a duty ratio of 0.003 and a processing time of 10min, the average grain size of AZ31 alloy is refined from 150 μm to 20 μm, the tensile strength is improved to 265 MPa and the elongation can reach 19.7%. The affect of the thermal and athermal effect on the recrystallization during EPT was analysied. The result shows that the athermal effect plays a major role in recrystallization and the mechanism of the athermal effect is also revealed.

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李貝貝,樊建鋒,曾勛,張華,張強,王曉丹,董洪標,許并社.經(jīng)電脈沖處理的軋制AZ31鎂合金組織與性能演變[J].稀有金屬材料與工程,2017,46(9):2695~2701.[Li Beibei, Fan Jian feng, Zeng Xun, Zhang Hua, Zhang qiang, Wang Xiaodan, Dong Hongbiao, Xu Bingshe. Microstructure and mechanical properties of rolled AZ31 alloy sheets processed by electropulsing treatment[J]. Rare Metal Materials and Engineering,2017,46(9):2695~2701.]
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  • 收稿日期:2015-07-26
  • 最后修改日期:2017-09-08
  • 錄用日期:2016-02-24
  • 在線發(fā)布日期: 2017-11-29
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