2上升至22.0±3 laths/μm2。當(dāng)預(yù)變形量較大時(shí)，如12%和20%，會(huì)形成板條狀的α相，這說明鈦合金經(jīng)預(yù)變形后再時(shí)效處理可以獲得細(xì)化的α相與更好的強(qiáng)化效果。"/>

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預(yù)變形對(duì)近β鈦合金時(shí)效階段的相變及微觀組織影響
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作者單位:

1.聊城大學(xué) 材料科學(xué)與工程學(xué)院，山東 聊城 252059;2.北京航空航天大學(xué) 材料科學(xué)與工程學(xué)院，北京 100191;3.天目山實(shí)驗(yàn)室，浙江 杭州 310023;4.棗莊學(xué)院 化學(xué)工程與材料科學(xué)學(xué)院，山東 棗莊 277160

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基金項(xiàng)目:

Natural Science Foundation of Shandong Province (ZR2022QE115); Liaocheng City Key Research Plan (2022YDSF85); Liaocheng University Doctoral Initiation Fund (318052132); Liaocheng University Students Innovation Plan (CXCY2023029); NSFC (51671012, 51671007 and 52174346), International Science and Technology Cooperation Program of China (2015DFA51430); Aeronautical Science Foundation of China (2015ZF51069);


Influence of Pre-deformation on Phase Transformations and Microstructures in Near β Ti Alloy During Aging
Author:
Affiliation:

1.School of Materials Science and Engineering, Liaocheng University, Liaocheng252059, China;2.School of Materials Science and Engineering, Beihang University, Beijing100191, China;3.Tianmushan Laboratory, Hangzhou310023, China;4.College of Chemistry, Chemical Engineering and Materials Science, Zaozhuang University, Zaozhuang277160, China

Fund Project:

Natural Science Foundation of Shandong Province (ZR2022QE115); Liaocheng City Key Research Plan (2022YDSF85); Liaocheng University Doctoral Initiation Fund (318052132); Liaocheng University Students Innovation Plan (CXCY2023029); National Natrual Science Foundation of China (51671012, 51671007, 52174346); International Science and Technology Cooperation Program of China (2015DFA51430); Aeronautical Science Foundation of China (2015ZF51069)

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    摘要:

    研究了預(yù)變形對(duì)近β鈦合金Ti-5Al-3Mo-3V-2Cr-2Zr-1Nb-1Fe（質(zhì)量分?jǐn)?shù)，%）在時(shí)效處理中相變、微觀組織及強(qiáng)化響應(yīng)的影響。結(jié)果表明，合金經(jīng)預(yù)變形后再進(jìn)行時(shí)效處理可以獲得明顯細(xì)化的α相與更好的時(shí)效強(qiáng)化效果。由于中間相O′、ω和O′′的形成抑制了長程應(yīng)力誘導(dǎo)馬氏體相變機(jī)制和機(jī)械孿晶，合金變形主要是通過位錯(cuò)滑移機(jī)制。預(yù)變形過程中會(huì)產(chǎn)生大量晶格缺陷，隨著預(yù)變形量的增大，位錯(cuò)數(shù)量密度逐漸上升。這些由預(yù)變形產(chǎn)生的晶格缺陷會(huì)在時(shí)效初期部分湮滅，但是仍然能夠促進(jìn)α相析出，實(shí)現(xiàn)α相細(xì)化。與未預(yù)變形的樣品相比，預(yù)變形量為5%的樣品在600 ℃時(shí)效后α相的平均寬度會(huì)下降57%，而且數(shù)量密度由7.0±1 laths/μm2上升至22.0±3 laths/μm2。當(dāng)預(yù)變形量較大時(shí)，如12%和20%，會(huì)形成板條狀的α相，這說明鈦合金經(jīng)預(yù)變形后再時(shí)效處理可以獲得細(xì)化的α相與更好的強(qiáng)化效果。

    Abstract:

    The influence of pre-deformation on phase transformations, microstructures and hardening response in near β Ti alloy Ti-5Al-3Mo-3V-2Cr-2Zr-1Nb-1Fe (wt%) during aging treatment was studied. The results show that obvious α phase refinement and stronger age hardening effect can be achieved when the alloy is slightly deformed before aging treatment. Because the formation of intermediate phases (O′, ω and O′′) suppresses long-range stress induced martensitic transformation and mechanical twinning, the alloy is mainly deformed via dislocation slipping during loading. Large numbers of crystal defects are generated during pre-deformation. With increasing the pre-deformation, the number density of dislocations increases gradually. These crystal defects generated by pre-deformation may partly annihilate upon early aging, but the precipitation of α can also be promoted, resulting in refined α precipitates. In the sample with 5% pre-strain, the average thickness of α precipitates decreases by 57% after aging at 600 °C compared with the sample without pre-strain, and the number density increases from 7.0±1 laths/μm2 to 22.0±3 laths/μm2. Some platelet-shaped α phases form when the samples experience comparably large pre-strains such as 12% and 20%. It proves that the refined α precipitates and better hardening effect can be achieved by pre-deformation plus aging treatment for titanium alloy.

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宋博,郗洪雷,付雨,王俊帥,肖文龍,任衍彪,馬朝利.預(yù)變形對(duì)近β鈦合金時(shí)效階段的相變及微觀組織影響[J].稀有金屬材料與工程,2024,53(11):3001~3009.[Song Bo, Xi Honglei, Fu Yu, Wang Junshuai, Xiao Wenlong, Ren Yanbiao, Ma Chaoli. Influence of Pre-deformation on Phase Transformations and Microstructures in Near β Ti Alloy During Aging[J]. Rare Metal Materials and Engineering,2024,53(11):3001~3009.]
DOI：10.12442/j. issn.1002-185X.20240111

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  • 收稿日期:2024-03-03
  • 最后修改日期:2024-09-26
  • 錄用日期:2024-05-09
  • 在線發(fā)布日期: 2024-11-18
  • 出版日期: 2024-11-08