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Microstructure and anisotropy of mechanical properties in ring rolled AZ80-Ag alloy

AZ80-Ag 镁合金环轧件的组织及力学性能各向异性

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Abstract

The microstructure, anisotropy in tensile strength and tensile creep resistance of the ring rolled AZ80-Ag alloy were studied. The ring exhibited higher strength along rolling direction (RD) than transverse direction (TD). The microstructure characterization and texture analysis demonstrated that the tilted basal texture was responsible for the higher tensile performance along RD. Investigations on the creep anisotropy revealed that the samples along RD had lower creep resistance, higher creep strain and higher steady creep rate at 70–80 MPa, compared with that along TD. The nominal creep stress exponent (n) values, 1.13 for RD and 3.86 for TD, indicated that diffusional creep and dislocation climb were the two corresponding creep mechanisms. During creep of the alloy, Mg17Al12 phase discontinuous precipitations were witnessed and their volume fraction enhanced with increasing stress.

摘要

本文研究了 AZ80-Ag 镁合金环轧件显微组织及拉伸强度和拉伸蠕变的各向异性。环件在轧向比横向有更高的强度, 织构分析结果表明基面织构偏转导致沿轧向有更好的拉伸性能。通过拉伸蠕变试验发现, 当蠕变应力在 70~80 MPa 时, 轧向比横向的蠕变抗性差, 会产生更高的蠕变应变和稳态蠕变速率。轧向和横向的蠕变应力指数n 分别为 1.13 和3.86, 分别对应扩散蠕变和位错攀移蠕变机制。在蠕变过程中, 环件会析出不连续 Mg17 Al12 相, 并且它们的体积分数随应力增加而增加。

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Authors and Affiliations

  1. School of Materials Science and Engineering, Central South University, Changsha, 410083, China

    Dong-dong Zhang  (张冬冬), Chu-ming Liu  (刘楚明), Ying-chun Wan  (万迎春), Shu-nong Jiang  (蒋树农) & Gang Zeng  (曾钢)

  2. School of Materials Science and Engineering, Hunan University of Science and Technology, Xiangtan, 411201, China

    Chu-ming Liu  (刘楚明)

Authors
  1. Dong-dong Zhang  (张冬冬)
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  2. Chu-ming Liu  (刘楚明)
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  3. Ying-chun Wan  (万迎春)
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  4. Shu-nong Jiang  (蒋树农)
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  5. Gang Zeng  (曾钢)
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Corresponding author

Correspondence to Shu-nong Jiang  (蒋树农).

Additional information

Foundation item

Projects(51574291, 51874367) supported by the National Natural Science Foundation of China; Project(2019JJ50787) supported by the Natural Science Foundation of Hunan Province, China; Project(2018M642999) supported by the China Postdoctoral Science Foundation

Contributors

ZHANG Dong-dong provided experimental data, analyzed the measured data, and edited the original draft of manuscript. LIU Chu-ming provided samples, equipment, and funding. WAN Ying-chun provided funding and edited the draft of manuscript. JIANG Shu-nong edited the draft of manuscript and supervised the whole experiment. ZENG Gang analyzed the measured data. All authors replied to reviewers’ comments and revised the final version.

Conflict of interest

ZHANG Dong-dong, LIU Chu-ming, WAN Ying-chun, JIANG Shu-nong, ZENG Gang declare that they have no conflict of interest.

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Zhang, Dd., Liu, Cm., Wan, Yc. et al. Microstructure and anisotropy of mechanical properties in ring rolled AZ80-Ag alloy. J. Cent. South Univ. 28, 1316–1323 (2021). https://doi.org/10.1007/s11771-021-4699-5

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  • DOI: https://doi.org/10.1007/s11771-021-4699-5

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