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变形条件对挤压态ZA21镁合金热变形和腐蚀行为的影响
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北京科技大学工程技术研究院

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中央高校基本科研业务费专项资金资助项目(项目号2302018FRF-IC-18-004)


Effect of deformation conditions on hot deformation and corrosion behavior of as-extruded ZA21 magnesium alloy
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Engineering Technology Research Institute,University of Science Technology Beijing

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Fundamental Research Funds for the Central Universities(No.2302018FRF-IC-18-004)

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    摘要:

    本文研究了变形温度、应变速率和变形量对挤压态ZA21镁合金的热变形行为及组织演变的影响规律,建立了热加工图,并对失稳区、安全区和最佳加工区试样进行浸泡失重和电化学试验,研究ZA21镁合金不同区域内的腐蚀行为。结果表明:在高温低应变速率时,ZA21镁合金的动态软化机制以动态回复为主,低温高应变速率时,以动态再结晶为主;最佳加工工艺温度为300~350℃、应变速率为0.001~0.01s-1,这主要与完全动态再结晶的产生有关;在同一加工工艺下,随变形量增加,ZA21镁合金自腐蚀电位明显正移,自腐蚀电流密度明显下降,当变形量增加至60%时,自腐蚀电流密度可降低3~4个数量级,这主要是因为晶粒细化导致合金表面形成了更加致密的氧化膜;但加工失稳区的微观组织存在楔形裂纹和明显孔洞,所以腐蚀速率相对较大。

    Abstract:

    In this paper, the effects of deformation temperature, strain rate and deformation on the hot deformation behavior and microstructure of as-extruded ZA21 magnesium alloy were investigated. The processing map was established, and the immersion weight loss and electrochemical tests were carried out on the unstable zone, the safe zone and the best processing zone to study the corrosion behavior in different regions of ZA21 magnesium alloy. The results show that the dynamic softening mechanism of ZA21 magnesium alloy is mainly dynamic recovery at high temperature and low strain rate, and dynamic recrystallization is dominant at low temperature and high strain rate; The optimum processing temperature is 300~350 °C, and the strain rate is 0.001~0.01s-1, which is mainly related to the generation of complete dynamic recrystallization; Under the same processing technology, with the increase of deformation, the self-corrosion potential of ZA21 magnesium alloy is obviously positively shifted, and the self-corrosion current density is significantly decreased. When the amount of deformation increases to 60%, the self-corrosion current density can be reduced by 3~4 orders of magnitude. This is mainly because the grain refinement leads to a denser oxide film on the surface of the alloy; However , the microstructure of the processing instability zone has wedge cracks and obvious pores, so the corrosion rate is relatively large.

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王盼盼,江海涛,王玉娇,张韵,于博文,仲彬彬,曹志明.变形条件对挤压态ZA21镁合金热变形和腐蚀行为的影响[J].稀有金属材料与工程,2020,49(10):3544~3551.[Panpan Wang, Haitao Jiang, Yujiao Wang, Yun Zhang, Bowen Yu, Binbin Zhong, Zhiming Cao. Effect of deformation conditions on hot deformation and corrosion behavior of as-extruded ZA21 magnesium alloy[J]. Rare Metal Materials and Engineering,2020,49(10):3544~3551.]
DOI:10.12442/j. issn.1002-185X.20190894

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  • 收稿日期:2019-10-29
  • 最后修改日期:2019-11-09
  • 录用日期:2019-11-12
  • 在线发布日期: 2020-11-04
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