s）比初生相α（αp）對時效參數(shù)更為敏感。此外，αs相的厚度與時效溫度和時效時間呈正相關(guān)。隨著時效溫度和時效時間的增加，Ti和Al元素在βt相中的偏析明顯，αs相由細針狀轉(zhuǎn)變?yōu)殚L棒狀。當合金在600 ℃時效12 h時，合金表現(xiàn)出較好的綜合力學性能?？估鞆姸取⑶姸群蜕扉L率分別為907 MPa、796 MPa和16%，沖擊功為55 J。"/>

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時效處理對Ti-6Al-3Nb-2Zr-Mo合金組織演變和力學性能的影響
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1.中國科學院金屬研究所 核材料與安全評估重點實驗室;2.中國科學技術(shù)大學 材料科學與工程學院;3.中國科學院金屬研究所 沈陽材料科學國家實驗室

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基金項目:

National Key Research and Development Program [Grant No. 2018YFA0702900], National Natural Science Foundation of China [Grant Nos. 52173305, 52101061, 52233017, 52203384], Strategic Priority Research Program of the Chinese Academy of Sciences [Grant No. XDC04000000], China Postdoctoral Science Foundation [Grant Nos. 2020M681004, 2021M703276], IMR Innovation Foundation [Grant No. 2022-PY12], LingChuang Research Project of China National Nuclear Corporation, and Youth Innovation Promotion Association, CAS.


Effects of Aging Treatment on Microstructure Evolution and Mechanical Properties of Ti-6Al-3Nb-2Zr-Mo Alloy
Author:
Affiliation:

1.Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;2.School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China;3.Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Fund Project:

National Key Research and Development Program (2018YFA0702900); National Natural Science Foundation of China (52173305, 52101061, 52233017, 52203384); Strategic Priority Research Program of the Chinese Academy of Sciences (XDC04000000); China Postdoctoral Science Foundation (2020M681004, 2021M703276); IMR Innovation Foundation (2022-PY12); LingChuang Research Project of China National Nuclear Corporation; Youth Innovation Promotion Association, CAS

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    摘要:

    為了解不同時效參數(shù)對Ti-6Al-3Nb-2Zr-Mo （Ti6321）合金組織和力學性能影響的根本原因，通過光學顯微鏡（OM）、掃描電鏡（SEM）、透射電鏡（TEM）和力學性能測試，研究了不同時效條件（500~650 ℃，3~24 h）下的顯微組織和力學性能。結(jié)果表明，次生相α（αs）比初生相α（αp）對時效參數(shù)更為敏感。此外，αs相的厚度與時效溫度和時效時間呈正相關(guān)。隨著時效溫度和時效時間的增加，Ti和Al元素在βt相中的偏析明顯，αs相由細針狀轉(zhuǎn)變?yōu)殚L棒狀。當合金在600 ℃時效12 h時，合金表現(xiàn)出較好的綜合力學性能?？估鞆姸?、屈服強度和伸長率分別為907 MPa、796 MPa和16%，沖擊功為55 J。

    Abstract:

    In order to understand the influence of the different aging parameters on the microstructure and mechanical properties of Ti-6Al-3Nb-2Zr-Mo (Ti6321) alloy, the microstructures and mechanical properties under different aging parameters (temperatures ranging from 500 °C to 650 °C, 3–24 h) were investigated by optical microscopy (OM), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and mechanical properties tests. The results reveal that the secondary α phase (αs) is more sensitive to the aging parameters than the primary α phase (αp). Moreover, the thickness of αs phase is positively correlated with aging temperature or aging time. As the aging temperature and aging time increase, the segregation of Ti and Al elements in the β transformation phase (βt) becomes obvious, and the αs phase changes from fine needle-like to long rod-like. When the alloy is aged at 600 °C for 12 h, the alloy shows good comprehensive mechanical performance. The tensile strength, yield strength, and elongation are 907 MPa, 796 MPa, and 16%, respectively, and the impact energy is 55 J.

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江海洋,江福清,王冰,徐斌,孫明月.時效處理對Ti-6Al-3Nb-2Zr-Mo合金組織演變和力學性能的影響[J].稀有金屬材料與工程,2023,52(6):2002~2009.[Jiang Haiyang, Jiang Fuqing, Wang Bing, Xu Bin, Sun Mingyue. Effects of Aging Treatment on Microstructure Evolution and Mechanical Properties of Ti-6Al-3Nb-2Zr-Mo Alloy[J]. Rare Metal Materials and Engineering,2023,52(6):2002~2009.]
DOI：10.12442/j. issn.1002-185X.20220943

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  • 收稿日期:2022-12-04
  • 最后修改日期:2023-02-07
  • 錄用日期:2023-02-14
  • 在線發(fā)布日期: 2023-07-03
  • 出版日期: 2023-06-30