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Mn微合金化對Ti-Al-Mo-Zr-Fe-B合金組織演變和力學(xué)性能的影響
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1.南京工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院 新材料研究院，江蘇 南京 211816;2.烏法理工大學(xué) 材料科學(xué)與金屬物理系，俄羅斯 烏法 450008

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Effect of Mn Microalloying on Microstructure Evolution and Mechanical Properties of Ti-Al-Mo-Zr-Fe-B Alloy
Author:
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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    摘要:

    通過OM、EBSD和TEM等研究了Mn微合金化對新型近α Ti-Al-Mo-Zr-Fe-B合金微觀組織和力學(xué)性能的影響。結(jié)果表明：添加0.5%（質(zhì)量分?jǐn)?shù)）的Mn元素可以將合金的鑄態(tài)微觀組織從3.28 μm細(xì)化到2.65 μm，使其抗拉伸強(qiáng)度從882 MPa提高到966 MPa，但延伸率從7.8%下降到5.1%。鍛造后的2種合金的晶粒尺寸趨于一致，微觀組織趨于等軸化且Mn微合金化后的組織更加均勻。鍛造后，Ti-Al-Mo-Zr-Fe-B合金的抗拉伸強(qiáng)度和延伸率增加到966 MPa和16.4%，而含有0.5%（質(zhì)量分?jǐn)?shù)）Mn元素的合金具有更高的抗拉伸強(qiáng)度，達(dá)到了1079 MPa，同時延伸率達(dá)到了15.8%。結(jié)論表明，強(qiáng)度的提高可以歸因于Mn元素的固溶強(qiáng)化效應(yīng)，同時Mn微合金化處理使合金中的Al元素富集于α相，有利于提高合金的強(qiáng)度和塑性。

    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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引用本文

何苗霞,燕遲,董月成,常輝,Alexandrov Igor V.Mn微合金化對Ti-Al-Mo-Zr-Fe-B合金組織演變和力學(xué)性能的影響[J].稀有金屬材料與工程,2024,53(6):1555~1565.[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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歷史
  • 收稿日期:2023-09-03
  • 最后修改日期:2023-11-03
  • 錄用日期:2023-11-13
  • 在線發(fā)布日期: 2024-06-20
  • 出版日期: 2024-06-17