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熱軋及退火Mg-5Li-1Al板材的組織及力學(xué)性能演變
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1.內(nèi)蒙古科技大學(xué) 材料與冶金學(xué)院;2.內(nèi)蒙古第一機(jī)械集團(tuán)有限公司第十分公司;3.重慶大學(xué)材料科學(xué)與工程學(xué)院;4.重慶大學(xué) 材料科學(xué)與工程學(xué)院

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Microstructure and mechanical property development in a hot-rolled and annealed Mg-5Li-1Al alloy sheet
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1.School of Materials and Metallurgy, Inner Mongolia University of Science and Technology;2.The tenth sub-company,Inner Mongolia First Machinery Group Corporation;3.College of Materials Science and Engineering,Chongqing University

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    摘要:

    Mg-5Li-1Al 合金板材在熱軋后分別經(jīng)150℃和300℃退火30分鐘。本文研究了熱軋及退火態(tài)Mg-5Li-1Al板材的微觀組織、力學(xué)性能及織構(gòu),并且討論了其塑性變形機(jī)制。結(jié)果顯示,退火態(tài)板材顯示出了弱的織構(gòu)和均勻的再結(jié)晶組織,其晶粒尺寸大約為15μm。隨著退火溫度的升高,合金板材的延伸率在逐漸提升,而抗拉強(qiáng)度、屈服強(qiáng)度、屈強(qiáng)比在減小,這些都對合金的成形性能非常有利。經(jīng)300℃退火30分鐘的合金板材表現(xiàn)出最好的力學(xué)性能,其原因在于Li元素的添加和退火溫度的升高。

    Abstract:

    Mg-5Li-1Al magnesium alloy sheets processed by hot rolling were annealed at 150℃ and 300℃ for 30 min, respectively. The microstructure, mechanical properties, and texture of rolled and annealed Mg-5Li-1Al alloy sheet were investigated. The plastic deformation mechanism was also discussed. The results show that the annealed sheet possesses weak basal texture and homogenous recrystallized structure with grain size of ~ 15 μm. Increasing annealing temperature results in an increase in tensile elongation and a decrease in tensile strength and yield ratio, which are generally favored for the improvement of sheet formability. The rolled LA51 sheet after annealing at 300℃ exhibits improved mechanical properties due to Li addition and high annealing temperature.

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李瑞紅,陳志軍,蔣斌,潘復(fù)生.熱軋及退火Mg-5Li-1Al板材的組織及力學(xué)性能演變[J].稀有金屬材料與工程,2018,47(12):3640~3644.[Li Ruihong, Chen Zhijun, Jiang Bin, Pan Fusheng. Microstructure and mechanical property development in a hot-rolled and annealed Mg-5Li-1Al alloy sheet[J]. Rare Metal Materials and Engineering,2018,47(12):3640~3644.]
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  • 收稿日期:2017-05-24
  • 最后修改日期:2017-08-10
  • 錄用日期:2017-08-16
  • 在線發(fā)布日期: 2019-01-04
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