{110}織構。但是，經(jīng)人工時效后的2198鋁鋰合金板材的各向異性因不均勻析出的T1相而發(fā)生了明顯的變化，45°方向上的強度得到了較大程度的提升，具有和TD方向相同的水平，硬化率發(fā)生了明顯的降低，TD方向成為硬化率最大的方向，而延伸率和斷口形狀的各向異性并未變化，可見T1相導致2198鋁鋰合金板材發(fā)生了各向異性的強化，卻對斷裂行為的各向異性影響較小。本文的研究旨在明確熱處理對2198鋁鋰合金板材各向異性力學行為的影響，為開發(fā)其塑性成形工藝提供理論依據(jù)，有助于提出2198鋁鋰合金板材強韌化的新思路。"/>

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熱處理狀態(tài)對2198鋁鋰合金板材各向異性力學行為的影響
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作者單位:

1.沈陽飛機工業(yè)集團有限公司;2.沈陽航空航天大學

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基金項目:

國家自然科學基金(51605310)和中國博士后科學基金(2019M661123)


Influence of Heat Treatment on the Anisotropic Mechanical Behavior of 2198 Al-Li Alloy Sheet
Author:
Affiliation:

1.Shenyang Aircraft Corporation;2.Shenyang Aerospace University

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    摘要:

    應用鋁鋰合金板材生產(chǎn)蒙皮等大型薄壁結構零件是航空制造輕量化的重要途徑，本文利用單向拉伸系統(tǒng)測試了不同熱處理狀態(tài)下2198鋁鋰合金板材沿著軋向（RD）、45°和橫向（TD）方向的力學行為，研究了熱處理對其各向異性的影響，并從晶體學織構、時效相和斷口形貌分析了微觀機制。結果發(fā)現(xiàn)，新淬火和自然時效狀態(tài)的2198鋁鋰合金板材具有相似的各向異性，RD方向具有最高的強度、最高的硬化率和最低的延伸率，45°方向則具有最低的強度、最低的硬化率和最高的延伸率，主要原因是軋制板材存在強烈的<112>{110}織構。但是，經(jīng)人工時效后的2198鋁鋰合金板材的各向異性因不均勻析出的T1相而發(fā)生了明顯的變化，45°方向上的強度得到了較大程度的提升，具有和TD方向相同的水平，硬化率發(fā)生了明顯的降低，TD方向成為硬化率最大的方向，而延伸率和斷口形狀的各向異性并未變化，可見T1相導致2198鋁鋰合金板材發(fā)生了各向異性的強化，卻對斷裂行為的各向異性影響較小。本文的研究旨在明確熱處理對2198鋁鋰合金板材各向異性力學行為的影響，為開發(fā)其塑性成形工藝提供理論依據(jù)，有助于提出2198鋁鋰合金板材強韌化的新思路。

    Abstract:

    The application of Al-Li alloy sheet with high specific strength and low fatigue crack growth rate for large thin-walled structural parts such as skin is an important way to reduce the weight of aeroplane. The mechanical behaviors of 2198 Al-Li alloy sheet along the rolling direction (RD), 45° and transverse direction (TD) were tested using unidirectional tension. The effect of heat treatment on its anisotropy was studied. The crystallographic texture, aging precipitate and fracture morphology were analyzed for the micro mechanism. It was found that the new-quenched and naturally aged 2198 Al-Li alloy sheet has similar anisotropy. RD has the highest strength, the highest hardening rate and the lowest elongation. 45° direction has the lowest strength and the lowest hardening rate and the highest elongation. The main reason is the strong <112> {110} texture in the rolled sheet. However, the anisotropy of the 2198 Al-Li alloy sheet after artificial aging has changed significantly due to the inhomogeneous precipitation of the T1 phase. The strength in 45° direction has been greatly improved to the level same as TD. And the hardening rate was significantly reduced. TD becomes the direction with the largest hardening rate. The anisotropy of elongation and fracture shape did not change. It can be seen that the T1 phase caused the anisotropic strengthening of the 2198 Al-Li alloy sheet but it has little effect on the anisotropy of fracture behavior. The purpose of this study is to clarify the effect of heat treatment on the anisotropic mechanical behaviors of 2198 Al-Li alloy sheet, to provide a theoretical basis for the development of its plastic forming process and to help to propose new ideas for strengthening and toughening of 2198 Al-Li alloy sheet.

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彭皓云,謝洪志,白雪山,張帥,尹延廣,趙天章.熱處理狀態(tài)對2198鋁鋰合金板材各向異性力學行為的影響[J].稀有金屬材料與工程,2021,50(4):1398~1404.[PENG Haoyun, XIE Hongzhi, BAI Xueshan, ZHANG Shuai, YIN Yanguang, ZHAO Tianzhang. Influence of Heat Treatment on the Anisotropic Mechanical Behavior of 2198 Al-Li Alloy Sheet[J]. Rare Metal Materials and Engineering,2021,50(4):1398~1404.]
DOI：10.12442/j. issn.1002-185X.20200385

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  • 收稿日期:2020-06-03
  • 最后修改日期:2020-07-15
  • 錄用日期:2020-07-21
  • 在線發(fā)布日期: 2021-05-08
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