增材/等材复合制备Sc/Zr改性Al-Mg合金工艺研究  

Process of Sc/Zr-Modified Al-Mg Alloy Prepared by Additive/Equivalent Composite Manufacturing

作　　者：赵宇辉[1,2] 贺晨 赵吉宾 邹健[3] 王志国[1,2] 何振丰 Zhao Yuhui;He Chen;Zhao Jibin;Zou Jian;Wang Zhiguo;He Zhenfeng(Shenyang Institute of Automation,Chinese Academy of Sciences,Shenyang 110016,Liaoning,China;Institutes for Robotics and Intelligent Manufacturing,Chinese Academy of Sciences,Shenyang 110169,Liaoning,China;School of Mechatronics Engineering,Shenyang Aerospace University,Shenyang 110135,Liaoning,China)

机构地区：[1]中国科学院沈阳自动化研究所,辽宁沈阳110016 [2]中国科学院机器人与智能制造创新研究院,辽宁沈阳110169 [3]沈阳航空航天大学机电工程学院,辽宁沈阳110135

出　　处：《光学学报》2023年第7期155-162,共8页Acta Optica Sinica

基　　金：国家自然科学基金(52105415)、国防科技重点实验室基金(JCKY61420052017)。

摘　　要：为了实现高性能、低孔隙率Al-Mg-Sc-Zr合金在航空航天主承力结构领域的广泛应用,采用激光熔化沉积-热轧复合工艺制备了Al-Mg-Sc-Zr合金试样。基于金相显微镜、扫描电子显微镜、显微硬度和室温拉伸实验等检测方法,探究了复合工艺与微观组织和力学性能之间的关系,确定了最优工艺参数;研究了热轧压下量对沉积态试样微观组织演变、微孔缺陷闭合行为及力学性能的影响规律。结果表明:微孔缺陷随压下量的增加而逐渐减少,当压下量达到50%时,微孔缺陷完全闭合,试样的强度和硬度显著提高,熔合线区域合金元素的分布变得均匀。在优化的工艺参数条件下,复合工艺制备试样的抗拉强度、屈服强度、延伸率和硬度分别为412 MPa、243 MPa、22.8%和118.76 HV,较未轧制试样分别提高了22.6%、12.5%、54.1%和15.3%。Objective As one of the most important lightweight structural materials,Al-Mg alloy has been widely used in the aerospace field due to its low density,high specific strength,and high stiffness.As a new type of high-strength aluminum alloy,Al-Mg-Sc-Zr alloy offers high elastic modulus,high specific strength,and excellent damage resistance.As the aerospace manufacturing industry develops,higher performance requirements are placed on aluminum alloy structures with complex geometry.Additive manufacturing(AM)technology has significant advantages in solving such problems.This paper is designed to achieve the wide application of high-performance aluminum alloys in primary load-bearing structures in the field of aerospace and obtain additive high-strength Al-Mg-Sc-Zr alloy samples with high compactness Methods The laser melting deposition(LMD)technology is employed to prepare samples with a size of 70 mmX 10 mm X 40 mm(lengthX widthXheight).The processing parameters for the deposited Al-Mg-Sc-Zr alloy samples are a laser power of 3500 W,a scanning rate of 10 mm/s,a powder-feeding rate of 0.7 r/min,a spot diameter of 4 mm,a carrier gas flow rate of 3.3 L/min,an overlap ratio of 50%,and an oxygen mass fraction<50X10-6.The experimental study of LMD-processed Al-Mg-Sc-Zr alloy reveals that pores are the most important current defect in this alloy,and it is also one of the factors that greatly affects the mechanical property of the deposited Al-Mg-Sc-Zr alloy samples.In this paper,hot-rolling experiments with different reduction drafts(15%,30%,and 50%)are conducted to weld the pores in the deposits at a later stage and thereby strengthen the alloy samples.Then,the paper further analyzed the influence of the reduction draft on the pore welding behavior,micromorphology,and mechanical property of the LMD-hot rolling(LMDHR)-processed Al-Mg-Sc-Zr alloy.Results and Discussions For the wide application of the Al-Mg-Sc-Zr alloy with high performance and low porosity in primary load-bearing structures in the field of aerospace,Al-Mg-S

关 键 词：材料 AL-MG-SC-ZR合金 激光熔化沉积 热轧工艺 微观组织 力学性能 

分 类 号：TG146[一般工业技术—材料科学与工程]