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Effect of Strain Rate and Sample Thickness on Mechanical Properties of Spray Deposited and Extruded Al–Zn–Mg–Cu Alloy

Journal of Materials Research and Technology-JMR&T(2022)

Changshu Inst Technol | Guangdong Univ Technol | Shanghai Spaceflight Precis Machinery Inst

Cited 5|Views12
Abstract
The microstructure of spray deposited and extruded Al–Zn–Mg–Cu alloy after regression re-aging (RRA) treatment was investigated by transmission electron microscope and electron back-scatter diffraction. The influence of strain rate and sample thickness on the mechanical properties were evaluated. The results showed that the main precipitate phases in the RRA Al–Zn–Mg–Cu alloy included short rod-shaped η′, coarse rod-shaped η and G.P. zones with nanoscale dimensions. The yield and ultimate tensile strength of RRA alloys were determined by sample thickness and strain rate to regulate the mass fraction of precipitate phases and the restraint of internal grains by sample surfaces, the number of activated slip systems and dislocation density. The RRA Al–Zn–Mg–Cu alloy exhibited a mixed-mode fracture due to the nanoscale precipitate phases restraining grain boundary sliding, the precipitate-free zones and high angle grain boundary inducing crack nucleation and propagation, and the post-necking elongation producing cleavage planes. The strain hardening is conducted by deformation texture. The strain hardening exponent n and the strain rate sensitivity coefficient m were determined by the sample thickness. The deformation texture intensity of RRA alloy was related to the strain rate controlled by texture components. The high strain rate improved the content of Cu texture {112}<-1-11> to elevate the mechanical properties of RRA alloy.
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Key words
Al–Zn–Mg–Cu alloy,Strain rate,Sample thickness,Mechanical properties,Texture
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要点】:研究探讨了应变率和样本厚度对喷沉积和挤压Al–Zn–Mg–Cu合金回归时效(RRA)处理后的微观结构和力学性能的影响,发现了应变率和样本厚度对析出相质量分数、晶粒内部约束及滑移系统激活数量的影响规律。

方法】:通过透射电子显微镜和电子背散射衍射技术分析了RRA处理后合金的微观结构,评估了应变率和样本厚度对力学性能的影响。

实验】:在喷沉积和挤压Al–Zn–Mg–Cu合金上进行实验,研究了不同应变率和样本厚度下的力学性能,使用的数据集为实验测定的屈服强度和抗拉强度等力学参数,结果显示合金表现出混合模式断裂特征,且应变硬化指数和应变率敏感性系数受样本厚度影响。