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高壓扭轉(zhuǎn)法制備非均勻?qū)訝罱Y(jié)構(gòu)Al-Zn-Mg-Cu-Zr合金的組織演變與力學性能
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作者單位:

合肥工業(yè)大學 材料科學與工程學院，安徽 合肥 230009

作者簡介:

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中圖分類號:

TG311

基金項目:

國家自然科學基金項目（51575153，51705119）


Microstructure Evolution and Mechanical Properties of Al-Zn-Mg-Cu-Zr Alloy of Heterogeneous Lamellar Structure Processed by High Pressure Torsion
Author:
Affiliation:

School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China

Fund Project:

National Natural Science Foundation of China (51575153, 51705119)

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    摘要:

    采用透射電子顯微鏡（TEM）、電子背散射衍射（EBSD）和Instron試驗機對試驗溫度400 ℃下高壓扭轉(zhuǎn)變形加工的Al-Zn-Mg-Cu-Zr合金進行組織和力學性能的表征與測試。結(jié)果表明，變形試樣的晶界和晶粒中的第二相明顯被破碎和細化，晶界無沉淀析出帶寬度變窄，大大提高了變形試樣的強度和塑性。初始樣品的晶粒取向是隨機分布的。當應(yīng)變較小時，試樣的晶粒尺寸、晶粒取向和局部取向差異均呈現(xiàn)非均勻的片層狀分布。由于非均勻?qū)訝罱M織在變形過程中產(chǎn)生的背應(yīng)力強化效應(yīng)，0.5圈變形試樣的力學性能最好。

    Abstract:

    The microstructures and mechanical properties of the Al-Zn-Mg-Cu-Zr alloy processed by high pressure torsion (HPT) at 400 °C were analyzed by transmission electron microscopy (TEM), electron back-scattered diffraction (EBSD), and Instron testing machine. The results show that the grain boundaries and the secondary phases in the grains of deformed specimens are significantly broken and refined, and the width of precipitation-free zones at the grain boundaries narrows, which greatly improves the strength and plasticity of the deformed specimens. The grain orientation of the initial specimen is randomly distributed. When the strain is small, the grain size, grain orientation, and the local orientation difference of the specimen all present heterogeneous lamellar distribution. The deformed specimens of 0.5 turn exhibit the optimal mechanical properties due to the back stress strengthening effect caused by the heterogeneous lamellar structure during deformation.

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薛克敏,王薄笑天,吳廣善,嚴思梁,李萍.高壓扭轉(zhuǎn)法制備非均勻?qū)訝罱Y(jié)構(gòu)Al-Zn-Mg-Cu-Zr合金的組織演變與力學性能[J].稀有金屬材料與工程,2021,50(9):3125~3132.[Xue Kemin, Wang Boxiaotian, Wu Guangshan, Yan Siliang, Li Ping. Microstructure Evolution and Mechanical Properties of Al-Zn-Mg-Cu-Zr Alloy of Heterogeneous Lamellar Structure Processed by High Pressure Torsion[J]. Rare Metal Materials and Engineering,2021,50(9):3125~3132.]
DOI：10.12442/j. issn.1002-185X.20200574

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  • 收稿日期:2020-08-05
  • 最后修改日期:2020-11-11
  • 錄用日期:2020-12-14
  • 在線發(fā)布日期: 2021-09-26
  • 出版日期: 2021-09-24