锻压技术

7075铝合金低应力多冲碰撞塑性变形动态响应

英文标题：Dynamic response on plastic deformation of 7075 aluminium alloy under low stress and multi-impact

作者：黄晓华1 2 傅戈雁2 杨强3

单位：（1. 苏州工业职业技术学院精密制造学院江苏苏州 215104 2.苏州大学机电工程学院江苏苏州215021 3.中国飞机强度研究所陕西西安 710065）

分类号：TG146.21

出版年,卷(期):页码：2024,49(9):230-238

摘要：

在338.1、382.3和433.6 MPa冲击应力下，使用0.25、1.00、2.00 和4.00 Hz的冲击频率对7075铝合金试样进行多冲碰撞试验，利用图像处理软件测量试样的累积塑性变形量和各层深值的变化，根据试验数据建立了S-σ-f-N的数学关系，并且通过金相显微组织分析晶粒变化。试验结果表明：试样的变形与冲击应力、冲击频率和冲击次数的大小有关，且均呈正相关，材料动态变形规律具有趋表效应，冲击频率逐级增大，形变增量梯度逐级衰减；当其他冲击条件相同时，冲击应力增大到一定值，约为7075铝合金材料的屈服强度的95.3%时，材料显微组织呈现纤维状。对比各项冲击因素，冲击应力是影响7075铝合金材料塑性变形的主要因素。

Under the impact stresses of 338.1,382.3 and 433.6 MPa, the multi-impact test on 7075 aluminum alloy specimen was conducted using the impact frequencies of 0.25,1.00,2.00 and 4.00 Hz, and the cumulative plastic deformation and the depth change of each layer for specimen were measured by image processing software. Then, based on the experimental data, the mathematical relationship of s-σ-f-N was established, and the grain change was analyzed by metallographic microstructure. The experimental results show that the deformation of specimen is related to impact stress, impact frequency and impact times, and they are all positively correlated. The dynamic deformation law of materials has the effect of tending to the surface. With the increasing of the impact frequency step by step, the deformation increment gradient decreases step by step. When the other impact conditions are the same, the impact stress increases to a certain value, about 95.3% yield strength of 7075 aluminium alloy, and the microstructure of material appears fibrous. Thus, comparing various impact factors, the impact stress is the main factor that affects the plastic deformation of 7075 aluminum alloy.

基金项目：

基金项目:国家自然科学基金资助项目（K111709416）；江苏省高校基础科学研究重大项目（23KJA460012）；苏州工业职业技术学院科研创新团队项目（2021KYTD001）

作者简介：黄晓华（1981-），女，硕士，副教授 E-mail：huangxh@siit.edu.cn

参考文献：

\[1］李琛，王和斌，欧平，等.7075 铝合金热变形行为和组织演变
［J］.金属热处理，2023，48(6): 147-156.

Li C，Wang H B，Ou P，et al.Hot deformation behavior and microstructure evolution of 7075 aluminum alloy\[J］.Heat Treatment of Metals，2023，48(6): 147-156.

\[2］耿其东，李春燕，洪捐.超声冲击对 7075 铝合金残余应力及微观组织的影响\[J］. 科学技术与工程，2020，20(8):3017-3023.

Geng Q D，Li C Y，Hong J.Effect of constant-current source ultrasonic impact strengthening on microstructure and residual stress of 7075 aluminum alloy\[J］.Science Technology and Engineering，2020，20(8):3017-3023.

\[3］毛玺，毛若鹏，冯丹霞.铣削 7075 铝合金表面粗糙度试验研究\[J］. 组合机床与自动化加工技术，2020(5):146-149.

Mao X，Mao R P，Feng D X.Experimental study on surface roughness of milling 7075 aluminum alloy\[J］. Modular Machine Tool and Automatic Manufacturing Technique，2020(5):146-149.

\[4］郭玉佩，王彬文，刘小川，等.多次冲击载荷作用下典型铝合金材料动态响应规律\[J］. 科学技术与工程，2021，21(16):6643-6650.

Guo Y P，Wang B W，Liu X C,et al.Dynamic response law of typical aluminum alloy materials under repeated-impact\[J］.Science Technology and Engineering，2021，21(16): 6643-6650.

\[5］许云华，熊建龙，武红，等.冲击接触载荷下45钢的微观塑性变形特征与损伤\[J］. 金属学报,2000,36(8):809-812.

Xun Y H，Xiong J L，Wu H，et al.Characteristics of micro-deformation and damage of mild carbon steel under impact contact load \[J］.Acta Metallurgica Sinica，2000,36(8): 809-812.

\[6］荆瑞红，石世宏.YT01低能量多碰塑性变形研究\[J］.哈尔滨工业大学学报,2017,49(5): 57-66，178-183.

Jing R H，Shi S H.Plastic deformation of YT01 submitted to repeated low-energy impacts\[J］.Journal of Harbin Institute of Technology,2017,49(5): 57-66,178-183.

\[7］傅戈雁，宋也黎，石世宏,等.机械零构件多冲碰撞失效研究的进展\[J］.热加工工艺,2003,32(6):50-52.

Fu G Y,Song Y L,Shi S H,et al.Studying achievement about the failure of mechanical components on repeated impact load\[J］.Hot Working Technology,2003,32(6):50-52.

\[8］傅戈雁，石世宏，欧阳八生，等.覆层零件多冲碰撞试验与失效特征\[J］.材料科学与工程学报,2004,22(2):217-219.

Fu G Y，Shi S H，Ouyang B S,et al.Repeated impact test and failure characteristic of mechanical components with cladding layer\[J］.Journal of Materials Science and Engineering,2004,22(2):217-219.

\[9］吴炯杰.碰撞能对低应力多碰塑性变形的影响研究及建模\[D］.苏州:苏州大学，20134.

Wu J J.Research and Model of Plastic Accumulation under Low Stress Repeated Impact and Different Impact Energy\[D］. Suzhou:Soochow University, 2013.

\[10］张倩茹.冲击频率对低应力多冲碰撞塑性变形的影响研究及建模\[D］.苏州:苏州大学，2015.

Zhang Q R.Research and Modeling of the Plastic Deformation under Low Repeated Impact Stress in Different Impact Frequencies\[D］.Suzhou:Soochow University, 2015.

\[11］薛山.MATLAB基础教程\[M］.4版.北京：清华大学出版社，2019.

Xu S.Matlab Basic Tutorial \[M］. 4nd Eidition.Beijing: Tsinghua University Press, 2019.

\[12］黄晓华，傅戈雁，杨强.不锈钢激光熔覆镍基粉末低应力多碰冲击塑性变形研究\[J］.应用激光，2021(12):50-52.

Huang X H,Fu G Y,Yang Q,et al.Low stress multi-impact plastic deformation of laser cladding nickel-based powder \[J］.Applied Laster,2021(12):50-52.

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