| 128 | 0 | 290 |
| 下载次数 | 被引频次 | 阅读次数 |
由于稀土(RE)元素在激光粉末床熔融(Laser powder bed fusion, LPBF)制备的WE43合金中具有超高的固溶度，因此本文省去固溶处理过程，直接对其进行T5时效处理，研究了T5时效处理对其微观组织、物相、缺陷以及拉伸性能的影响。结果表明：T5时效处理后，WE43合金中的椭圆形和鱼鳞纹组织消失，平均晶粒尺寸由2μm长大至8.5μm,稀土相由点状弥散分布在α-Mg晶体内转变为连续或较小间距的分布在晶界处，形状为碟状或片状、针状，整体分布均匀；T5时效处理后WE43合金的屈服强度、抗拉强度和伸长率相对于LPBF态分别下降了12.6%、10.7%和6.6%,其力学性能降低的原因可归因于以下3个方面：时效后合金的晶粒尺寸增大；时效后连续或较小间距分布于晶界处的脆性析出相破坏了晶界的连续性，以及微孔等缺陷依然存在；时效后稀土元素从α-Mg基体中析出，导致其在α-Mg基体中的固溶度降低；但稀土原子在α-Mg中的固溶度对LPBF制备的WE43合金塑性的影响程度相对较低。
Abstract：Due to the extremely high solid solubility of rare earth(RE) elements in WE43 alloy prepared by laser powder bed fusion(LPBF), this study omitted the solution treatment process and directly subjected it to T5 aging treatment to investigate the effects of T5 aging treatment on microstructure, phase, defects and tensile properties of the WE43 alloy. The results show that after T5 aging treatment, the elliptical and fish scale like structures in the WE43 alloy disappear, and the average grain size increases from 2 μm to 8.5 μm. The rare earth phase changes from point like dispersed distribution within the α-Mg crystal to continuous or small spacing distribution at the grain boundaries, with a shape of disc, sheet or needle, and uniform distribution overall. The yield strength, tensile strength and elongation of the WE43 alloy after T5 aging treatment decrease by 12.6%, 10.7%, and 6.6% respectively compared to the alloy without aging treatment. The reason for the decrease in mechanical properties of the alloy after T5 aging can be attributed to the following three aspects: the increase in grain size of the alloy after aging; the brittle precipitates distributed continuously or with small spacing at the grain boundaries after aging have disrupted the continuity of the grain boundaries, and defects such as micropores still exist; the rare earth elements precipitate from the α-Mg matrix after aging, resulting in a decrease in their solid solubility in the α-Mg matrix. However, the influence of the solid solubility of rare earth atoms in α-Mg on the plasticity of the WE43 alloy prepared by LPBF is relatively low.
[1] Xu C,Nakata T,Oh-Ishi K,et al.Improving creep property of Mg-Gd-Zn alloy via trace Ca addition[J].Scripta Materialia,2017,139:34-38.
[2] Kang Y H,Yan H,Chen R S.Creep behavior and microstructure evolution of sand-cast Mg-4Y-2.3 Nd-1Gd-0.6 Zr alloy crept at 523-573 K[J].Journal of Materials Science & Technology,2017,33:79-89.
[3] 刘武平，陈乐平，周全，等.Zn和Sr复合处理对WE43镁合金组织及性能影响[J].特种铸造及有色合金，2023,43(11):1555-1560.LIU Wu-ping,CHEN Le-ping,ZHOU Quan,et al.Effects of Zn and Sr compound treatment on microstructure and properties of WE43 magnesium alloy[J].Special Casting & Nonferrous Alloys,2023,43(11):1555-1560.
[4] Pang S S,Zhao W X,Qiu T Y,et al.Study on surface quality and mechanical properties of micro-milling WE43 magnesium alloy cardiovascular stent[J].Journal of Manufacturing Processes 2023,101:108090.
[5] 田晓莹，魏健雄，闫宏，等.热等静压对低压铸造WE43镁合金组织和室温及高温力学性能的影响[J].材料热处理学报，2023,44(10):87-95.TIAN Xiao-ying,WEI Jian-xiong,YAN Hong,et al.Effect of hot isostatic pressing on the microstructure,room temperature and high temperature mechanical properties of low-pressure cast WE43 magnesium alloy[J].Transactions of Materials and Heat Treatment,2023,44(10):87-95.
[6] Zhang Y,Tan L L,Wang Q C,et al.Effects of microstructure on the torsional properties of biodegradable WE43 Mg alloy[J].Journal of Materials Science & Technology,2020,51:10210.
[7] Lei B,Jiang B,Yang H,et al.Effect of Nd addition on the microstructure and mechanical properties of extruded Mg-Gd-Zr alloy[J].Materials Science and Engineering A,2021,816:141320.
[8] 王征远，秦守益，王先飞，等.热处理对WE43镁合金显微组织和力学性能的影响[J].特种铸造及有色合金，2021,41(3):364-367.WANG Zheng-yuan,QIN Shou-yi,WANG Xian-fei,et al.Influence of heat treatment on microstructure and properties of WE43 magnesium alloy[J].Special Casting & Nonferrous Alloys,2021,41(3):364-367.
[9] 陈利超，王长喜，苏植成，等.时效工艺对WE43镁合金组织与力学性能的影响[J].金属热处理，2022,47(5):208-212.CHEN Li-chao,WANG Chang-xi,SU Zhi-cheng,et al.Effect of aging process on microstructure and mechanical properties of WE43 magnesium alloy[J].Heat Treatment of Metals,2022,47(5):208-212.
[10] 尹浜兆，刘金戈，刘冰川，等.WE43镁合金激光粉末床熔融工艺研究[J].中国激光，2022,49(14):76-86.YIN Bang-zhao,LIU Jin-ge,LIU Bing-chuan,et al.Process optimization on laser powder bed fusion of WE43 magnesium alloy[J].Chinese Journal of Lasers,2022,49(14):76-86.
[11] Seede R,Whitt A,Ye J,et al.A lightweight Fe-Mn-Al-C austenitic steel with ultra-high strength and ductility fabricated via laser powder bed fusion[J].Materials Science and Engineering A,2023,874:145007.
[12] Milaege D,Eschemann N,Hoyer P K,et al.Anisotropic mechanical and microstructural properties of a Ti-6Al-7Nb alloy for biomedical applications manufactured via laser powder bed fusion[J].Crystals,2024,14(2):117.
[13] Li K,Chen W,Yin B Z,et al.A comparative study on We43 magnesium alloy fabricated by laser powder bed fusion coupled with deep cryogenic treatment:Evolution in microstructure and mechanical properties[J].Additive Manufacturing 2023,77:103814.
[14] Hyer H,Le Z,George B,et al.Additive manufacturing of dense WE43 Mg alloy by laser powder bed fusion[J].Additive Manufacturing 2020,33:101123.
[15] 高海瑞，李继康，张振武，等.多场调控金属激光增材制造研究现状与展望(特邀)[J].中国激光，2024,51(10):99-121.GAO Hai-rui,LI Ji-kang,ZHANG Zhen-wu,et al.Research status and prospect of multi-field modulated metal laser additive manufacturing (Invited)[J].Chinese Journal of Lasers,2024,51(10):99-121.
[16] 王迪，黄锦辉，谭超林，等.激光增材制造过程中循环热输入对组织和性能的影响[J].金属学报，2022,58(10):1221-1235.WANG Di,HUANG Jin-hui,TAN Chao-lin,et al.Review on effects of cyclic thermal input on microstructure and property of materials in laser additive manufacturing[J].Acta Metallurgica Sinica,2022,58(10):1221-1235.
[17] 汪飞，卢学刚.材料科学基础[M].西安：西安交通大学出版社，2023.WANG Fei,LU Xue-gang.Fundamentals of Materials Science[M].Xi’an:Xi’an Jiaotong University Press,2023.
[18] 彭立明，邓庆琛，吴玉娟，等.镁合金选区激光熔化增材制造技术研究现状与展望[J].金属学报，2023,59(1):31-54.PENG Li-ming,DENG Qing-chen,WU Yu-juan,et al.Additive manufacturing of magnesium alloys by selective laser melting technology:A Review[J].Acta Metallurgica Sinica,2023,59(1):31-54.
[19] 阮玉陶.固溶态WE43稀土镁合金室温单轴压缩变形机理研究[D].重庆：重庆理工大学，2022.YUAN Yu-tao.Research on deformation mechanism of WE43-T4 rare earth magnesium alloy under uniaxial compression at room temperature[D].Chongqing:Chongqing University of Technology,2022.
[20] Michi R A,Plotkowski A,Shyam A,et al.Towards high-temperature applications of aluminium alloys enabled by additive manufacturing[J].International Materials Reviews,2021,67:298-345.
[21] Wei K W,Gao M,Wang Z M,et al.Effect of energy input on formability,microstructure and mechanical properties of selective laser melted AZ91D magnesium alloy[J].Materials Science and Engineering A,2014,611:212-222.
[22] Bai J F,Wang Q L,Men Z X,et al.Generation mechanism of anisotropy in mechanical properties of WE43 fabricated by laser powder bed fusion[J].Micromachines,2024,15:976.
[23] Knudsen F P.Dependence of mechanical strength of brittle polycrystalline specimens on porosity and grain size[J].Journal of the American Ceramic Society,1959,42:376-387.
[24] 王秋林，李明富，门正兴，等.激光熔化沉积制造翅片热管管壳[J].热加工工艺，2023,52(13):127-130.WANG Qiu-lin,LI Ming-fu,MEN Zheng-xing,et al.Fabrication of finned heat pipe shell by laser melting deposition[J].Hot Working Technology,2023,52(13):127-130.
[25] 万响亮，李光强，周博文，等.奥氏体不锈钢晶粒细化对形变机制和力学性能的影响[J].材料工程，2016,44(8):29-33.WAN Xiang-liang,LI Guang-qiang,ZHOU Bo-wen,et al.Effect of grain refinement on deformation mechanism and mechanical properties of austenitic stainless steel[J].Materials Engineering,2016,44(8):29-33.
基本信息:
DOI：10.13289/j.issn.1009-6264.2024-0344
中图分类号:TG156.92;TG665;TG146.22
引用信息:
[1]岳太文,王秋林,门正兴,等.T5时效对激光粉末床熔融制备的WE43合金组织和性能的影响[J].材料热处理学报,2025,46(05):44-53.DOI:10.13289/j.issn.1009-6264.2024-0344.
基金信息:
国家自然科学基金(52201105); 四川省自然科学基金(2023NSFSC0407,2022NSFSC0324); 成都航空职业技术学院重点自然科研项目(ZZX0623069); 成都市哲学社会科学重点研究基地-成都航空产业发展与文化建设研究中心项目(CAIACDRCXM2024-13)
2025-05-25
2025-05-25