-1條件下進(jìn)行了熱壓縮試驗(yàn)，研究了雙相Mg-Li合金的熱加工性能、顯微組織演變和相組成。建立了整合加工和α-Mg相含量的最佳熱加工窗口。結(jié)果表明，所建立的Arrhenius本構(gòu)模型能夠準(zhǔn)確預(yù)測(cè)軟化過(guò)程中的應(yīng)力流動(dòng)行為。通過(guò)對(duì)合金顯微組織的觀察，發(fā)現(xiàn)動(dòng)態(tài)回復(fù)（DRV）、動(dòng)態(tài)再結(jié)晶（DRX）和α-Mg相變是主要的軟化機(jī)制。α-Mg相以球化和α-Mg相內(nèi)析出的形式轉(zhuǎn)變?yōu)棣?Li相，尤其是在300 ℃以上相變現(xiàn)象顯著。同時(shí)，DRX行為容易在β-Li相中發(fā)生，而在α-Mg相中會(huì)被抑制?；趧?dòng)態(tài)材料模型和微觀結(jié)構(gòu)分析，獲得最佳加工窗口：溫度300?350 ℃/0.1?1 s-1和溫度250 ℃/0.1 s-1。"/>

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雙相Mg-Li合金的 α→β 相變及熱加工性能研究
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作者單位:

1.北京科技大學(xué) 機(jī)械工程學(xué)院，北京 100083;2.金屬輕量化成形制造北京市重點(diǎn)實(shí)驗(yàn)室，北京 100083

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基金項(xiàng)目:

國(guó)家自然科學(xué)基金項(xiàng)目（面上項(xiàng)目，重點(diǎn)項(xiàng)目，重大項(xiàng)目）,


Hot Workability of Dual-Phase Mg-Li Alloy with α→β Trans-formation at Elevated Temperatures
Author:
Affiliation:

1.School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China;2.Beijing Key Laboratory of Lightweight Metal Forming, Beijing 100083, China

Fund Project:

National Natural Science Foundation of China (52175285, 52161145407); Fundamental Research Funds for the Central Universities (FRF-BD-20-08A, FRF-AT-20-09, FRF-TP-20-009A2)

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    摘要:

    在溫度為250?400 ℃、應(yīng)變速率為0.1?10 s-1條件下進(jìn)行了熱壓縮試驗(yàn)，研究了雙相Mg-Li合金的熱加工性能、顯微組織演變和相組成。建立了整合加工和α-Mg相含量的最佳熱加工窗口。結(jié)果表明，所建立的Arrhenius本構(gòu)模型能夠準(zhǔn)確預(yù)測(cè)軟化過(guò)程中的應(yīng)力流動(dòng)行為。通過(guò)對(duì)合金顯微組織的觀察，發(fā)現(xiàn)動(dòng)態(tài)回復(fù)（DRV）、動(dòng)態(tài)再結(jié)晶（DRX）和α-Mg相變是主要的軟化機(jī)制。α-Mg相以球化和α-Mg相內(nèi)析出的形式轉(zhuǎn)變?yōu)?i>β-Li相，尤其是在300 ℃以上相變現(xiàn)象顯著。同時(shí)，DRX行為容易在β-Li相中發(fā)生，而在α-Mg相中會(huì)被抑制。基于動(dòng)態(tài)材料模型和微觀結(jié)構(gòu)分析，獲得最佳加工窗口：溫度300?350 ℃/0.1?1 s-1和溫度250 ℃/0.1 s-1。

    Abstract:

    Hot workability, microstructure evolution, and phase composition of dual-phase Mg-Li alloy were investigated via hot compression test at 250?400 °C with strain rates of 0.1?10 s-1. The optimum hot workability window integrating processing and α-Mg content maps was established. Results show that the established Arrhenius constitutive model can accurately predict the stress flow behavior during work softening. In addition, the microstructure of the alloy shows that dynamic recovery (DRV), dynamic recrystallization (DRX) and α-Mg phase transformation are the main softening mechanisms. α-Mg phase is transformed into β-Li phase in forms of both spheroidization and internal precipitation of α-Mg phase, especially above 300 °C. Meanwhile, the DRX process can easily occur in β-Li phase, whereas in the α-Mg phase it is retarded. Based on the dynamic materials model and microstructure analysis, the optimal processing window can be obtained as 300?350 °C/0.1?1 s-1 and 250 °C/0.1 s-1.

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馮英豪,孫朝陽(yáng),徐斯諾,朱南洋,王青磊,王春暉.雙相Mg-Li合金的 α→β 相變及熱加工性能研究[J].稀有金屬材料與工程,2023,52(4):1227~1237.[Feng Yinghao, Sun Chaoyang, Xu Sinuo, Zhu Nanyang, Wang Qinglei, Wang Chunhui. Hot Workability of Dual-Phase Mg-Li Alloy with α→β Trans-formation at Elevated Temperatures[J]. Rare Metal Materials and Engineering,2023,52(4):1227~1237.]
DOI：10.12442/j. issn.1002-185X. E20220026

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  • 收稿日期:2022-09-21
  • 最后修改日期:2023-04-03
  • 錄用日期:2022-11-09
  • 在線發(fā)布日期: 2023-04-28
  • 出版日期: 2023-04-25