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热变形含镁Zn-Cu-Ti合金组织特征、力学性能和耐腐蚀性能
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1.中国矿业大学材料与物理学;2.中国矿业大学 材料与物理学院;3.江苏中矿大正表面工程技术有限公司

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国家自然科学基金资助(51971241和52171091)


Microstructure, mechanical properties and corrosion resistance of hot-deformed magnesium-containing Zn-Cu-Ti alloy
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1.China University of Mining and Technology,School of Material Science and Physics,Xuzhou;2.Jiangsu CUMT Dazheng Surface Engineering Technology Co,Ltd

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    摘要:

    本文采用挤压加轧制的方法制备Zn-0.75Cu-0.15Ti-0.3Mg合金板材,并探讨其组织演变过程、力学性能和耐腐蚀性能。结果表明:挤压变形后Zn-0.75Cu-0.15Ti-0.3Mg合金呈细小的等轴晶形貌,Zn基体中存在微米级TiZn3和MgCuZn颗粒相以及纳米级CuZn5颗粒相。轧制变形促使合金的晶粒发生长大,并且晶粒尺寸较为不均匀。随着轧制变形量的增大,基体形变诱导晶内更多MgCuZn颗粒相的析出。轧制变形后合金的强度和延伸率均呈降低趋势,抗拉强度从142.7MPa降低到不到110MPa,这主要归因于晶粒的长大和脆性第二相的增多。不过,轧制变形有助于合金耐腐蚀性能的提高,轧制态合金具有较低的腐蚀电流密度(25.47×10-5Amp/cm2)和较高的腐蚀产物层电阻(166.7Ω/cm2)。

    Abstract:

    In this paper, Zn-0.75Cu-0.15Ti-0.3Mg alloy sheet was prepared by extrusion and rolling method, and its microstructure evolution process, mechanical properties and corrosion resistance were discussed. The results show that the Zn-0.75Cu-0.15Ti-0.3Mg alloy exhibits a fine equiaxed crystal morphology after extrusion deformation. Micro-scale TiZn3 and MgCuZn phases and nano-scale CuZn5 phase exist in Zn matrix. Rolling deformation promotes the grain growth of Zn matrix and the grain size is relatively non-uniform. With the increase of rolling deformation, the matrix deformation induces the precipitation of more MgCuZn in the Zn grains. After rolling deformation, both the strength and elongation of the alloy show a decreasing trend, and the tensile strength decreases from 142.7 MPa to less than 110 MPa, which was mainly attributed to the growth of grains and the increase of brittle second phases. However, the rolling deformation contributes to the improvement of the corrosion resistance of the alloy. The as-rolled alloy exhibits a lower corrosion current density (25.47×10-5Amp/cm2) and a higher corrosion product layer resistance (166.7Ω/cm2) compared to extruded alloy.

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戚继球,顾胡维,倪雅,孟庆坤,隋艳伟,委福祥.热变形含镁Zn-Cu-Ti合金组织特征、力学性能和耐腐蚀性能[J].稀有金属材料与工程,2022,51(11):4243~4250.[Qi Jiqiu, Gu Huwei, Ni Ya, Meng Qingkun, Sui Yanwei, Wei Fuxiang. Microstructure, mechanical properties and corrosion resistance of hot-deformed magnesium-containing Zn-Cu-Ti alloy[J]. Rare Metal Materials and Engineering,2022,51(11):4243~4250.]
DOI:10.12442/j. issn.1002-185X.20220223

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历史
  • 收稿日期:2022-03-21
  • 最后修改日期:2022-07-04
  • 录用日期:2022-07-12
  • 在线发布日期: 2022-12-02
  • 出版日期: 2022-11-30