Al-10.78Zn-2.78Mg-2.59Cu-0.22Zr-0.047Sr铝合金挤压材的性能

doi:10.11901/1005.3093.2015.115

材料研究学报

2015, Vol. 29

Issue (10): 729-736 DOI: 10.11901/1005.3093.2015.115

本期目录 | 过刊浏览

Al-10.78Zn-2.78Mg-2.59Cu-0.22Zr-0.047Sr铝合金挤压材的性能

张香丽(

),许晓静,凌智勇,蒋伟

江苏大学先进制造与现代装备技术工程研究院镇江 212013

Microstructure and Mechanical Properties of an Extruded Al-Alloy Al-10.78Zn-2.78Mg-2.59Cu-0.22Zr-0.047Sr

Xiangli ZHANG(

),Xiaojing XU,Zhiyong LING,Wei JIANG

Institute of Advanced Manufacturing and Modern Equipment Technology Engineering, Jiangsu University, Zhenjiang 212013, China

引用本文:

张香丽,许晓静,凌智勇,蒋伟. Al-10.78Zn-2.78Mg-2.59Cu-0.22Zr-0.047Sr铝合金挤压材的性能[J]. 材料研究学报, 2015, 29(10): 729-736.
Xiangli ZHANG, Xiaojing XU, Zhiyong LING, Wei JIANG. Microstructure and Mechanical Properties of an Extruded Al-Alloy Al-10.78Zn-2.78Mg-2.59Cu-0.22Zr-0.047Sr[J]. Chinese Journal of Materials Research, 2015, 29(10): 729-736.

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摘要:

研究了Al-10.78Zn-2.78Mg-2.59Cu-0.22Zr-0.047Sr铝合金挤压材在固溶-T652和预回复-固溶-T652时的组织和性能。结果表明: 该合金在121℃×24 h时效制度下, 预回复退火处理可有效细化晶粒(从9.76 μm减小到5.56 μm), 降低晶界平均角度(从23.59°降低至17.41°), 显著提高低角度晶界百分比(从53%提高到67%), 提高位错强化, 并显著抑制再结晶的发生; 与固溶-T652相比, 预回复-固溶-T652工艺在不降低强度的情况下可提高其晶间和剥落腐蚀性能(最大晶间腐蚀深度从125.0 μm减少到91.4 μm, 剥落腐蚀从EB级提高到EA级); 在预回复-固溶-T652状态下合金的抗拉强度达到728 MPa, 预回复退火处理能提高合金的强度。位错强化和低角度晶界强化是合金的主要强化机制。

关键词 ：金属材料, 超高强铝合金, 预回复, 组织, 性能

Abstract：

Effect of solid solution-T652 treatment and pre-recovery-solid solution-T652 treatment on microstructure and mechanical properties of an extruded Al-alloy Al-10.78Zn-2.78Mg-2.59Cu-0.22Zr-0.047Sr was studied. The results show that after a pre-recovery-annealing treatment and then a post-aging at 121^oC for 24 h the grain size of the extrusion can be refined from 9.76 μm to 5.56 μm; the average grain boundary angle can be reduced from 23.59° to 17.41°, i.e.the percentage of low angle grain boundary is significantly enhanced from 53% to 67%, therewith, the dislocation strengthening is increased, and the recrystallization process may be suppressed. Compared with solid solution-T652, the pre-recovery-annealing treatment can enhance the corrosion resistance of the alloy, i.e. the maximum corrosion depth may be reduced from 125.0 μm to 91.4 μm, thus its exfoliation corrosion rating increased from EB to EA grade, while the alloy maintained a high strength. The strength of the alloy after the pre-recovery-solid solution plus T652 treatment is up to 728 MPa. Dislocation strengthening and low angle grain boundary strengthening are the main strengthening mechanisms.

Key words： metallic materials high-strength aluminum alloy pre-recovery-annealing treatment microstructure mechanical properties

收稿日期: 2015-03-06

基金资助:* 江苏大学研究生科研创新计划项目KYXX_0031资助。

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表1 实验用合金的实测成分

图1 实验合金固溶-T652和预回复-固溶-T652处理后的OM、SEM组织图

表2 实验合金组织的化学成分

图2 实验合金固溶-T652处理后的分析谱、预回复-固溶-T652处理后的分析谱、固溶-T652处理后的半高峰宽以及预回复-固溶-T652处理后的半高峰宽

图3 根据XRD数据计算经固溶-T652处理和预回复-固溶-T652处理试样的XRD相干衍射区尺寸和晶格应变

表3 从XRD数据计算出的一些微观结构与力学性能的特征参数

图4 固溶-T652处理和预回复-固溶-T652处理后合金试样的EBSD组织、晶界角度分布和晶粒尺寸分布图

表4 从EBSD分析计算得到的平均晶粒尺寸(L)、高及低角度晶界的百分比、高及低角度晶界的角度平均值

表5 经不同热处理后合金的电导率、硬度、抗拉强度和延伸率

图5 不同热处理下合金的晶间腐蚀形貌(a)固溶-T652; (b)预回复-固溶-T652

图6 合金在不同热处理下的剥落腐蚀形貌(a)固溶-T652; (b)预回复-固溶-T652

表6 不同热处理下合金的晶界强化与晶粒内部位错强化

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