7075-T651铝合金表面纳米化处理及其强化机理

李莹; 侯振国; 钮旭晶

doi:10.7512/j.issn.1001-2303.2022.10.09

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7075-T651铝合金表面纳米化处理及其强化机理
Surface Nano-treatment of 7075-T651 AluminumAlloy and its Strengthening Mechanism
2022年52卷第10期页码：57-61
DOI： 10.7512/j.issn.1001-2303.2022.10.09

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李莹，侯振国，钮旭晶.7075-T651铝合金表面纳米化处理及其强化机理［J］.电焊机，2022，52（10）：57-61.

LI Ying, HOU Zhenguo, NIU Xujing.Surface Nano-treatment of 7075-T651 AluminumAlloy and its Strengthening Mechanism[J].Electric Welding Machine, 2022, 52(10): 57-61.
李莹，侯振国，钮旭晶.7075-T651铝合金表面纳米化处理及其强化机理［J］.电焊机，2022，52（10）：57-61. DOI： 10.7512/j.issn.1001-2303.2022.10.09.

LI Ying, HOU Zhenguo, NIU Xujing.Surface Nano-treatment of 7075-T651 AluminumAlloy and its Strengthening Mechanism[J].Electric Welding Machine, 2022, 52(10): 57-61. DOI： 10.7512/j.issn.1001-2303.2022.10.09.

摘要

通过表面机械滚压处理（SMRT）方法实现了7075-T651铝合金表面的纳米化。电子背散射衍射（EBSD）研究表明，SMRT后的试样表层形成了梯度纳米层：表层纳米晶粒层厚度约为50 μm，平均晶粒尺寸约为200 nm；亚表层变形晶粒层厚度约为450 μm，平均晶粒尺寸约为2 µm，母材呈现出典型的轧制晶粒特征，平均晶粒尺寸约为5 µm。拉伸试验结果表明，SMRT后试样的强度得到了显著提高，塑韧性也没有明显下降。通过SMRT在材料的表层引入了梯度纳米结构，这种特殊结构具有较为优秀的强度和塑性的匹配，是力学性能提升的主要原因。

Abstract

The surface nano-treatment of 7075-T651 aluminum alloy was realized by surface mechanical rolling treatment (SMRT) method. Electron backscatter diffraction (EBSD) results show that a 500 μm thick gradient nano-layer is formed on the surface of SMRT sample, the thickness of the surface nano-crystal layer is about 50 μm and the average grain size is about 200 nm. The thickness of the subsurface deformation grain layer is about 450 μm, and the average grain size is about 2 µm. The base metal shows typical rolling grain characteristics, and the average grain size is about 5 µm. The tensile test results show that the tensile strength, yield strength and elongation of the original 7075-T651 aluminum alloy are 545 MPa, 506 MPa and 17.3% respectively. After SMRT, the tensile strength, yield strength and elongation are 620 MPa, 536 MPa and 13.4% respectively. The strength of the sample significantly improves, and the toughness does not significantly decrease. Gradient nanostructures are introduced into the surface layer of the material by SMRT. This special structure has excellent matching of strength and plasticity, which is the main reason for the improvement of mechanical properties.

关键词

7075铝合金梯度纳米结构表面机械滚压处理表面纳米化处理

Keywords

7075 aluminum alloygradient nanostructuresurface mechanical rolling treatmentsurface nano-treatment

references

田福泉，李念奎，崔建忠.超高强铝合金强韧化的发展过程及方向［J］.轻合金加工技术，2005，33（12）：1-9.

Tian F Q，Li N K，Cui J Z.Research and Development of Ultra High Strength Aluminum Alloys［J］.Light Alloy Fabrication Technology，2005，33（12）：1-9.

Bakhshi R，Farshidi M H，Sajjadi S A.Streng-thening of aluminium alloy 7005 through imposition of severe plastic deformation supplemented by different ageing treatments［J］.Transactions of Nonferrous Metals Society of China，2021，31（10）：2909-2921.

Huang H W，Wang Z B，Lu J，et al.Materialia Fatigue behaviors of AISI 316L stainless steel with a gradient nanostructured surface layer［J］.Acta Materialia，2015，87：150-160.

Liu X C，Zhang H W，Lu K.Formation of nano-laminated structure in nickel by means of surface mechanical grinding treatment［J］.Acta Materialia，2015， 96：24-36.

Xu W，Liu X C，Lu K.Strain-induced microstructure refinement in pure Al below 100 nm in size［J］.Acta Materialia，2018，152：138-147.

Long J Z，Pan Q S，Tao N R，et al.Abnormal grain coarsening in cyclically deformed gradient nanograined Cu［J］.Scripta Materialia，2018，145：99-103.

Zhang K，Wang Z B，Lu K.Enhanced fatigue property by suppressing surface cracking in a gradient nanostructured bearing steel［J］.Materials Research Letters，2017，5（4）：258-266.

EN-573-3铝和铝合金化学成分和半成品形状第3部分：化学成分［S］.

Lu K.Making strong nanomaterials ductile with gradients［J］.Science，2014，345：1455-1456.

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