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Home > Archive>Volume 53, Issue 6, 2024 >1555-1565. DOI:10.12442/j.issn.1002-185X.20230547
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Effect of Mn Microalloying on Microstructure Evolution and Mechanical Properties of Ti-Al-Mo-Zr-Fe-B Alloy
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Affiliation:

1.Tech Institute for Advanced Materials, College of Materials Science and Engineering, Nanjing Tech University, Nanjing 211816, China;2.Department of Materials Science and Physics of Metals, Ufa University of Science and Technology, Ufa 450008, Russia

Fund Project:

National Key Research and Development Program of China (2021YFB3700802); Russian Science Foundation Project (23-43-00041); National Natural Science Foundation of China (51931008); Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)

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    Abstract:

    The effects of Mn microalloying on the microstructure and mechanical properties of new near-α Ti-Al-Mo-Zr-Fe-B alloy were studied by OM, EBSD, and TEM. Results indicate that the addition of 0.5wt% Mn can refine the casting microstructure of the alloy from 3.28 μm to 2.65 μm, which leads to the increase in ultimate tensile strength from 882 MPa to 966 MPa. However, the elongation decreases from 7.8% to 5.1%. After forging, the grain size of two alloys tends to be similar, and the microstructure is more equiaxed. Besides, the microstructure becomes more homogeneous after Mn microalloying. The ultimate tensile strength and elongation of Ti-Al-Mo-Zr-Fe-B alloy increase to 966 MPa and 16.4%, respectively, whereas the alloy containing 0.5wt% Mn element possesses higher ultimate tensile strength, reaching 1079 MPa. Meanwhile, the elongation reaches 15.8%. These results suggest that the increase in strength can be attributed to the solid solution strengthening effect of Mn element. Additionally, the Mn microalloying promotes the enrichment of Al element in alloy into the α phase, which is beneficial to improve the strength and plasticity of the alloy.

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[He Miaoxia, Yan Chi, Dong Yuecheng, Chang Hui, V Alexandrov Igor. Effect of Mn Microalloying on Microstructure Evolution and Mechanical Properties of Ti-Al-Mo-Zr-Fe-B Alloy[J]. Rare Metal Materials and Engineering,2024,53(6):1555~1565.]
DOI：10.12442/j. issn.1002-185X.20230547

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History
  • Received:September 03,2023
  • Revised:November 03,2023
  • Adopted:November 13,2023
  • Online: June 20,2024
  • Published: June 17,2024

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