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冷軋預(yù)變形對(duì)新型鋁鋰合金的時(shí)效析出與力學(xué)性能影響
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中南大學(xué)輕質(zhì)高強(qiáng)結(jié)構(gòu)材料國(guó)防科技重點(diǎn)實(shí)驗(yàn)室

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預(yù)研基金((6142912180105，41422060204)


Effect of cold rolling pre-deformation on microstructure andproperties of a new Aluminum lithium alloy
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Science and Technology on High-strength Structural Materials,Central South University

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    摘要:

    采用大氣熔煉鑄造及熱變形方法制備了Al-4.5Cu-1Li-0.7Mg-1Zn-0.3Ag-0.3Mn-0.2Zr新型鋁鋰合金板材。通過維氏硬度、拉伸性能、掃描電鏡、透射電鏡等方法，研究了固溶后不同冷軋預(yù)變形量對(duì)顯微組織和力學(xué)性能影響。結(jié)果表明，時(shí)效前的冷軋預(yù)變形量有效促進(jìn)了新型鋁鋰基體合金中T1(Al2CuLi)相的析出與均勻分布，減少了θ′(Al2Cu)相的體積分?jǐn)?shù)。冷軋預(yù)變形量的增加，縮短了峰時(shí)效時(shí)間，晶界析出相由連續(xù)析出變?yōu)榉沁B續(xù)析出，無沉淀析出區(qū)寬度變小。當(dāng)冷軋預(yù)變形量為15%時(shí)，時(shí)效態(tài)合金的屈服強(qiáng)度與抗拉強(qiáng)度分別達(dá)到了668 MPa、690 MPa，延伸率保持在7.9%。

    Abstract:

    New Al-4.5Cu-1Li-0.7Mg-1Zn-0.3Ag-0.3Mn-0.2Zr aluminium lithium alloys were prepared by casting and hot formation. The effects of cold-rolled pre-deformation on microstructure and mechanical properties after solid solution were investigated using Vickers hardness, tensile testing, scanning electron microscopy and transmission electron microscopy. The results show that cold-rolled pre-deformation can effectively promote the precipitation of T1 phases and reduce the volume fraction of θ" phases in the matrix. Adding cold-rolled pre-deformation resulted in an enhanced age hardening response and shorter the time to reach peak aging. At the same time, the grain boundary precipitates change from continuous precipitation to discontinuous precipitation, and the width of the PFZs becomes smaller. The yield strength, tensile strength and elongation of as-aged alloy, when the pre-deformation amount was 15%, were 668 MPa, 690 MPa and 7.9%, respectively.

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吳名冬,肖代紅,陳煒斌,黃靜,黃蘭萍,劉文勝.冷軋預(yù)變形對(duì)新型鋁鋰合金的時(shí)效析出與力學(xué)性能影響[J].稀有金屬材料與工程,2020,49(9):3251~3259.[Wu Mingdong, Xiao Daihong, Chen Weibing, Huang Jin, Huang Lanping, Liu Wensheng. Effect of cold rolling pre-deformation on microstructure andproperties of a new Aluminum lithium alloy[J]. Rare Metal Materials and Engineering,2020,49(9):3251~3259.]
DOI：10.12442/j. issn.1002-185X.20190782

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  • 收稿日期:2019-09-23
  • 最后修改日期:2019-10-24
  • 錄用日期:2019-11-12
  • 在線發(fā)布日期: 2020-10-15
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