退火态增材制造AlSi10Mg合金在极端条件下的力学行为  

Mechanical behavior of additively manufactured AlSi10Mg alloy with annealing state under extreme conditions

作　　者：张权 陈剑斌 史同亚 汪小锋 南小龙[3] 王永刚[1,2] ZHANG Quan;CHEN Jianbin;SHI Tongya;WANG Xiaofeng;NAN Xiaolong;WANG Yonggang(The Faculty of Mechanical Engineering and Mechanics,Ningbo University,Ningbo 315211,Zhejiang,China;Key Laboratory of Impact and Safety Engineering,Ministry of Education,Ningbo University,Ningbo 315211,Zhejiang,China;National Key Laboratory of Shock Wave and Detonation Physics,Institute of Fluid Physics,China Academy of Engineering Physics,Mianyang 621999,Sichuan,China)

机构地区：[1]宁波大学机械工程与力学学院,浙江宁波315211 [2]宁波大学冲击与安全工程教育部重点实验室,浙江宁波315211 [3]中国工程物理研究院流体物理研究所冲击波物理与爆轰物理全国重点实验室,四川绵阳621999

出　　处：《爆炸与冲击》2025年第3期37-52,共16页Explosion and Shock Waves

基　　金：冲击波物理与爆轰物理全国重点实验室稳定支持项目(JCKYS2023212005);宁波市科技创新2025重大专项(2021Z099,2023Z005,2023Z012);新金属材料国家重点实验室开放基金(2023-Z04)。

摘　　要：采用激光选区熔化技术制备AlSi10Mg合金并对其进行去应力退火处理,利用光学显微镜、扫描电子显微镜和电子背散射衍射技术研究了合金的微观组织。为了解宽应变率和宽温度耦合作用对AlSi10Mg合金力学行为的影响,通过配有环境温箱的万能试验机和分离式霍普金森压杆分析了AlSi10Mg合金在极端条件下的力学行为。结果表明:AlSi10Mg合金具有精细的胞状-枝晶微观结构,主要包含α-Al相和Si相,经退火处理后,微观组织由断续的、呈链状分布的共晶Si颗粒构成。AlSi10Mg合金在室温、应变率为0.002~4800 s^(-1)时,呈现出应变率强化效应,且在不同的应变率范围内具有不同的敏感性;在173 K下具有更高的屈服强度和流动应力;当温度为173~243 K时,流动应力对温度不敏感;而温度为293~573 K时,温度敏感性显著提高,合金软化效应随着温度的升高而加剧。基于实验结果拟合得到修正的J-C本构模型并对其进行了验证,该模型可较好地反映材料在高、低温和不同应变率下的力学行为。In this study,AlSi10Mg alloy was prepared by selective laser melting(SLM)first,and then subjected to stress relieved annealing treatment.The microstructures of the alloy were analyzed by optical microscope(OM),scanning electron microscope(SEM)and electron backscatter diffraction(EBSD)technology.To understand the influence of coupling effects on the mechanical behavior of AlSi10Mg alloy under wide strain rates and wide temperatures,the mechanical behavior of the alloy under extreme conditions(high and low temperatures,high strain-rate)were analyzed by universal testing machine with an environmental chamber and split Hopkinson pressure bar.The results show that AlSi10Mg alloy possesses fine cellular dendritic microstructure,mainly including α-Al and Si phases,and annealing treatment can result in the discontinuous distribution of eutectic Si particles.AlSi10Mg alloy displays strain-rate strengthening effect under room temperature condition at 0.002-4800 s^(−1),and has different strain-rate sensitivity in different strain-rate ranges.The material has higher yield strength and flow stress at 173 K.When the strain-rate is 0.002 s^(-1),the SLM AlSi10Mg alloy has different temperature sensitivities in different temperature ranges.The alloy does not have temperature sensitivity in the range of 173-243 K;the material exhibits temperature sensitivity ranging from 293 K to 573 K,and the softening effect due to temperature on the material intensifies with increasing temperature.Based on the J-C constitutive model,a modified J-C constitutive model expressed by piecewise functions is constructed and the experimental results are fitted.In addition,experimental verification was conducted on the modified J-C constitutive model,and the predicted results are basically consistent with the experimental results.Within the scope of the study,the modified J-C constitutive model effectively reflects the mechanical behavior of the alloy at high and low temperatures and under different strain-rate.

关 键 词：激光选区熔化 AlSi10Mg合金 微观组织 力学行为 修正的J-C本构模型 

分 类 号：O347.1[理学—固体力学]