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沖擊載荷作用下Mg-Li合金的力學(xué)性能及顯微組織
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教育部博士點(diǎn)基金（20092304110003）；中央高校科研基本業(yè)務(wù)費(fèi)（GK2020260124）


Mechanical Property and Microstructure of Mg-Li Alloys under High Strain Rate Impact Load
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    摘要:

    采用分離式霍普金森壓桿（SHPB）對(duì)真空熔煉制備的Mg-Li合金進(jìn)行了靜、動(dòng)態(tài)試驗(yàn)研究，試件的加載應(yīng)變率范圍為1.7×10-3~1026 s-1，得到了材料在不同應(yīng)變率下的應(yīng)力-應(yīng)變曲線。并根據(jù)實(shí)驗(yàn)結(jié)果確立了Mg-Li合金在一維應(yīng)力高應(yīng)變率沖擊狀態(tài)下的本構(gòu)關(guān)系。同時(shí)還分析了不同應(yīng)變率沖擊后Mg-Li合金的金相組織。結(jié)果表明，該Mg-Li合金在室溫下的動(dòng)態(tài)沖擊性能對(duì)應(yīng)變率不敏感。Mg-Li合金在一維應(yīng)力高應(yīng)變率沖擊狀態(tài)下的本構(gòu)關(guān)系為σ=1.5ε，（σ<0.12 GPa），σ=0.12+2.7ε1.2（σ≥0.12 GPa）。隨著應(yīng)變率的增加，晶粒尺寸先變小，再趨于不規(guī)則形狀，而且晶界處分布的短條狀化合物也逐漸集中。

    Abstract:

    The static and dynamic mechanical responses of Mg-Li alloy prepared by vacuum induction melting were investigated by split Hopkinson pressure bar (SHPB) under the strain rates of 1.7×10-3-1026 s-1, and the stress-strain curves under different strain rates were obtained. Based on the SHPB experimental results, the constitutive relation of this alloy under one-dimensional stress high strain rates impact was fitted. Besides, the metallurgical structure of the Mg-Li alloy after impact under different strain rates was also analyzed. Results show that the dynamic impact properties of the Mg-Li alloy are not sensitive to the strain rate. The constitutive relation of the Mg-Li alloy under one-dimensional stress high strain rates impact is σ=1.5ε (σ<0.12 GPa), and σ=0.12+2.7ε1.2 (σ≥0.12 GPa). With increase of the strain rate, the grains become smaller at first and then tend to be irregular shapes. The short-strip compounds are concentrated distributing in the boundaries.

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鄒廣平,唱忠良,陳 思,王瑞瑞,張密林.沖擊載荷作用下Mg-Li合金的力學(xué)性能及顯微組織[J].稀有金屬材料與工程,2012,41(3):514~517.[Zou Guangping, Chang Zhongliang, Chen Si, Wang Ruirui, Zhang Milin. Mechanical Property and Microstructure of Mg-Li Alloys under High Strain Rate Impact Load[J]. Rare Metal Materials and Engineering,2012,41(3):514~517.]
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  • 收稿日期:2011-03-20
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