-1~3800s-1對應(yīng)變率敏感,在4800s-1時幾乎無應(yīng)變率敏感性。合金晶粒隨應(yīng)變率變化發(fā)生不同程度的變形,且隨著應(yīng)變率的提高,晶粒變形不均勻性加重；析出相粒子形態(tài)、密度、尺寸等在4800s-1動態(tài)沖擊前后發(fā)生明顯變化。"/>

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新型Al-Mg-Zn合金不同應(yīng)變率動態(tài)沖擊性能與組織變化
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北京科技大學(xué) 新金屬材料國家重點實驗室

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國防科技創(chuàng)新特區(qū)項目


Effect of different strain rates on dynamic impact properties and microstructure of novel Al-Mg-Zn alloy
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State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing

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    摘要:

    通過Gleeble-1500、分離式Hopkinson壓桿、金相、掃描和透射電鏡探究了Al-Mg-Zn合金準(zhǔn)靜態(tài)及動態(tài)沖擊過程中的力學(xué)性能和組織演化。Al-Mg-Zn合金在準(zhǔn)靜態(tài)下表現(xiàn)為整體應(yīng)變硬化效應(yīng)。合金在1300s-1~3800s-1對應(yīng)變率敏感,在4800s-1時幾乎無應(yīng)變率敏感性。合金晶粒隨應(yīng)變率變化發(fā)生不同程度的變形,且隨著應(yīng)變率的提高,晶粒變形不均勻性加重；析出相粒子形態(tài)、密度、尺寸等在4800s-1動態(tài)沖擊前后發(fā)生明顯變化。

    Abstract:

    The mechanical properties and microstructure evolution of novel Al-Mg-Zn alloy during quasistatic and dynamic impact processes were investigated by Gleeble-1500, separated Hopkinson pressure bar(SHPB), optical microscope, scan electron microscope and transmission electron microscope. The Al-Mg-Zn alloy exhibited a global strain hardening effect in quasistatic impact. The dynamic yield strength increased first and then decreased slightly with the increase of strain rate. The grains of alloy deformed to different degrees with the change of strain rate, and the grains deformation inhomogeneity became more serious with the increase of strain rate. The morphology, density and size of precipitates varied significantly before and after dynamic impact with 4800s-1.

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劉浩然,趙澤宇,張迪,張濟山.新型Al-Mg-Zn合金不同應(yīng)變率動態(tài)沖擊性能與組織變化[J].稀有金屬材料與工程,2022,51(5):1767~1772.[Liu Haoran, Zhao Zeyu, Zhang Di, Zhang Jishan. Effect of different strain rates on dynamic impact properties and microstructure of novel Al-Mg-Zn alloy[J]. Rare Metal Materials and Engineering,2022,51(5):1767~1772.]
DOI：10.12442/j. issn.1002-185X.20210392

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  • 收稿日期:2021-04-30
  • 最后修改日期:2021-06-18
  • 錄用日期:2021-07-09
  • 在線發(fā)布日期: 2022-06-09
  • 出版日期: 2022-05-30