Mg-Zn合金中{10-12}孪生剪切与析出相相互作用结构的电子显微研究
孙鹏阳，刘林林，孙 威*，刘翠秀
(北京工业大学固体微结构与性能研究所，北京100124)
摘 要 本文利用TEM、HRTEM、STEM-HAADF、FFT等多种表征技术，对室温轧制Mg-6Zn (wt.%)时效合金中β1’析出相结构予以表征与研究。结果表明：（1）合金中存在三种析出相，都与孪晶有交互作用；（2）首次从原子尺度上直接观察到β1’相在{10-12}孪晶内界面处的结构变化，显示该析出相在经过基体{10-12}孪生剪切作用后，在宏观形貌上产生了3.6°的偏转。这些结果为进一步研究、设计新的镁锌合金提供借鉴与参考。
关键词 镁合金；{10-12}孪晶；析出相；剪切相互作用；电子显微术
中图分类号：TG146；TG115.21+5.3
文献标识码：Adoi:10.3969/j.issn.1000-6281.2021.05.008
Electron microscopy study of interaction structure for the precipitates subjected to the {10-12} twin shearing in a Mg-Zn alloy
SUN Peng-yang，LIU Lin-lin，SUN Wei*，LIU Cui-xiu
( Institute of Microstructure and Property of Advanced Materials, Beijing University of Technology, Beijing 100124, China)
Abstract In this paper, the characteristic structure of β1' precipitates in the Mg-6Zn (wt.%) aged alloy subjected to room-temperature rolling was observed and researched by TEM, HRTEM, STEM-HAADF, FFT and other characterization techniques. The results show that: (1)three types of precipitates exist in the alloy, all of which interact with the twins; (2) the change of interface structure of a β1' precipitate in the {10-12} twin was directly observed at atomic scale for the first time, which shows that the precipitate produces a 3.6 ° appearance bending after being subjected to the {10-12} twin shear. These results provide a reference for further research and design of new Mg-Zn alloys.
Keywords magnesium alloy；{10-12} twinning；precipitated phase；shear interaction；electron microscopy
“全文下载请到同方知网，万方数据库或重庆维普等数据库中下载！”
[1]AVEDESIAN M M，BAKER H. ASM specialty handbook: magnesium and magnesium alloys [M]. Ohio: ASM International，1999：274.
[2] 刘江洪. 镁合金在轨道交通装备中的应用和展望[J]. 新材料产业，2018，299(10):22-24.
[3] 吴玉娟，丁文江，彭立明，等. 高性能稀土镁合金的研究进展[J]. 中国材料进展，2011，30(2): 1-9.
[4] 张艺钟. 高性能镁合金的研发与应用[J]. 中国金属通报，2018，992(5): 36-37.
[5]王强，张治民，张宝红，等. 镁合金变形强韧化研究进展[J]. 材料导报, 2006, 20(f05):431-433.
[6]DONG S，YU Q，JIANG Y，et al. Characteristic cyclic plastic deformation in ZK60 magnesium alloy [J]. International Journal of Plasticity, 2017, 91: 25-47.
[7] LIU X C, ZHANG H W, LU K. Strain-induced ultrahard and ultrastable nanolaminated structure in nickel [J]. Science, 2013, 342(6156): 337-340.
[8]NIE J F. Preface to viewpoint set on: phase transformations and deformation in magnesium alloys [J]. Scripta Mater，2003, 48: 981-984.
[9]BARNETT M R, DAVIES C, MA X. An analytical constitutive law for twinning dominated flow in magnesium [J]. Scripta Materialia, 2005, 52: 627-632.
[10]KOIKE J, SATO Y, ANDO D. Origin of the anomalous {10-12} twinning during tensile deformation of Mg alloy sheet [J]. Materials Transactions, 2008, 49(12):2792-2800.
[11] 泰靖, 周博, 隋曼龄. AZ31镁合金形变扭折带中{10-12}孪生行为的电子显微学研究[J]. 电子显微学报，2017, 36(6):547-551.
[12] 李万鹏, 刘翠秀, 陈斌，等. Mg-Y-Nd合金{10-11}孪晶界面稀土原子偏聚的电子显微研究[J]. 电子显微学报, 2018, 37(6):24-31.
[13]韩广达，孙威，习卫，等. Mg-Y-Nd-Zn镁合金冲击变形结构特征的电子显微研究[J]. 电子显微学报，2014，33(4):313-317.
[14]CAPOLUNGO L，BEYERLEIN I J，KASCHNER G C，et al. On the interaction between slip dislocations and twins in HCP Zr [J]. Materials Science and Engineering, 2009, 513-514: 42-51.
[15] 王子荣，孙威，李万鹏，等. 变形Mg-Gd合金中退孪生组态的透射电子显微研究[J]. 电子显微学报，2017, 36(6):542-546.
[16] 毕建军，刘翠秀，李万鹏，等. Mg-Y合金中共轴{11-21}孪晶交互的电子显微研究[J]. 电子显微学报，2019，38(5):496-501.
[17]NIE J F. Effects of precipitate shape and orientation on dispersion strengthening in magnesium alloys [J]. Scripta Materialia, 2003, 48(8):1009-1015.
[18]CHUN J S, BYRNE J G, BORNEMANN A. The inhibition of deformation twinning by precipitates in a magnesium-zinc alloy [J]. Philosophical Magazine，1969，20: 291−300.
[19]ROBSON J D, STANFORD N, BARNETT M R. Effect of particles in promoting twin nucleation in a Mg-5wt.%Zn alloy[J]. Scripta Materialia, 2010, 63: 823−826.
[20]JAIN J, POOLE W J, SINCLAIR C W, et al. Reducing the tension-compression yield asymmetry in a Mg-8Al-0.5Zn alloy via precipitation [J]. Scripta Materialia, 2010, 63: 301−304.
[21]ROBSON J D. The effect of internal stresses due to precipitates on twin growth in magnesium [J]. Acta Materialia, 2016, 121:277-287.
[22] 汪涛, 孙威, 王子荣, 等. Mg-Y-Nd-Zn合金中LPSO的存在对孪晶形成的影响[J]. 电子显微学报, 2016, 35(5):393-398.
[23]STANFORD N, BARNETT M R. Effect of particles on the formation of deformation twins in a magnesium-based alloy [J]. Materials Science & Engineering A，2009，516(1):226-234.
[24]ROBSON J D, STANFORD N, BARNETT M R. Effect of precipitate shape on slip and twinning in magnesium alloys [J]. Acta Materialia, 2011, 59(5):1945-1956.
[25]LI B, MATHAUDHU S N. Interaction between a Mg17Al12 precipitate and {10-12} <10-12> twin boundary in magnesium alloys[A]. In: HORT N, MATHAUDHU S N, NEELAMEGGHAM N R, et al. Magnesium Technology 2013[C]. Cham: Springer，2013：89-94.
