<strong>Mg-5.6Gd-0.8Zn</strong>合金多向锻造过程中的变形机制及动态再结晶

doi:10.11900/0412.1961.2019.00292

金属学报

2020, Vol. 56

Issue (5): 723-735 DOI: 10.11900/0412.1961.2019.00292

本期目录 | 过刊浏览

Mg-5.6Gd-0.8Zn合金多向锻造过程中的变形机制及动态再结晶

张阳, 邵建波, 陈韬, 刘楚明, 陈志永(

)

中南大学材料科学与工程学院长沙 410083

Deformation Mechanism and Dynamic Recrystallization of Mg-5.6Gd-0.8Zn Alloy During Multi-Directional Forging

ZHANG Yang, SHAO Jianbo, CHEN Tao, LIU Chuming, CHEN Zhiyong(

)

School of Materials Science and Engineering, Central South University, Changsha 410083, China

引用本文:

张阳, 邵建波, 陈韬, 刘楚明, 陈志永. Mg-5.6Gd-0.8Zn合金多向锻造过程中的变形机制及动态再结晶[J]. 金属学报, 2020, 56(5): 723-735.
Yang ZHANG, Jianbo SHAO, Tao CHEN, Chuming LIU, Zhiyong CHEN. Deformation Mechanism and Dynamic Recrystallization of Mg-5.6Gd-0.8Zn Alloy During Multi-Directional Forging[J]. Acta Metall Sin, 2020, 56(5): 723-735.

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摘要:

以含长周期堆垛有序(LPSO)相的Mg-5.6Gd-0.8Zn (质量分数，%)合金为研究对象，分析了合金多向锻造过程中的变形机制、动态再结晶及显微组织演变。结果表明：变形初期，{ $10 1 ˉ 2$ }拉伸孪生仅在部分晶粒中激发；随锻造方向的改变，不同晶体取向的晶粒能够激发孪生变形，孪生体积分数增加，孪生变体选择符合Schmid定律。孪生受阻碍的晶粒通过滑移及扭折协调变形，扭折带类型主要为转轴分布在< $10 1 ˉ 0$ >晶向的基面扭折。多向锻造过程中，晶界处优先发生动态再结晶；随着变形量的增加，晶界处再结晶体积分数增大，晶内孪晶与扭折界面诱发再结晶，孪晶逐渐演变为条带状细晶组织。在孪晶、扭折带切割晶粒，晶界再结晶，孪晶、扭折带诱发再结晶多重机制的共同作用下，原始粗晶组织得到了显著细化。

关键词 ：镁合金, LPSO相, 多向锻造, 变形机制, 动态再结晶

Abstract：

Multi-directional forging (MDF) is an effective way to fabricate wrought magnesium alloy with ultrafine grains and random texture. Therefore, microstructure evolution and dynamic recrystallization (DRX) of magnesium alloys during MDF process have been widely investigated. Mg-Zn-RE alloys containing long-period stacking ordered (LPSO) phase have received considerable attention owing to their excellent mechanical properties. In addition, LPSO phase has great effects on the deformation mechanism and DRX behavior. Still, limited comprehensive studies can be found in the literature dealing with the microstructure evolution, deformation mechanism and DRX of magnesium alloys containing LPSO phase in MDF deformation. In this work, MDF was applied to a Mg-5.6Gd-0.8Zn (mass fraction, %) alloy containing LPSO phase. Microstructure characteristics, deformation mechanism and DRX behavior of the material in different passes were examined. Results show that there are several stages of the microstructure evolution. Twinning was activated only in a small part of grains in the early stage of deformation. As the forging direction changes, the number of twinned grains and the volume fraction of DRX grains increased. A mixed structure with coarse deformed grain and DRX grains was sustained till last forging pass, and the average size of DRX grains is about 4 μm with a random orientation. { $10 1 ˉ 2$ } tensile twinning is the main deformation mechanism and the selection of twin variants was dominated by the Schmid law. Change in forging direction is beneficial to twinning stimulation in grains of different orientations. Kink and slipping deformation could effectively accommodate the plastic strain where the operation of twinning was hindered. Kink deformation resulted in lattice rotation predominately about the < $10 1 ˉ 0$ > axis. DRX grains nucleated at different places during the forging process. Not only the grain boundaries and the twinned region, but also kink boundaries can induce the nucleation of DRX grains. Eventually, the twinned regions were transformed to a strip-like recrystallization structure. Under the combined influence of twinning and kinking, as well as DRX induced by twins, kink bands and grain boundaries, the initial coarse grains were significantly refined.

Key words： magnesium alloy LPSO phase multi-directional forging deformation mechanism dynamic recrystallization

收稿日期: 2019-09-05

ZTFLH:

TG146.2

基金资助:国家自然科学基金项目(51874367);国家自然科学基金项目(51574291)

作者简介: 张阳，女，1995年生，硕士

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https://www.ams.org.cn/CN/10.11900/0412.1961.2019.00292 或 https://www.ams.org.cn/CN/Y2020/V56/I5/723

图1 多向锻造流程及微观组织观测取样位置示意图

图2 铸态、均匀化态及退火态Mg-5.6Gd-0.8Zn合金的SEM像

图3 退火态合金长周期堆垛结构(LPSO)相的STEM像

图4 退火态合金锻后各道次显微组织的OM像

图5 多向锻造过程中孪生及扭折诱发再结晶

图6 合金锻后各道次样品SEM像

图7 多向锻造过程中的动态再结晶行为示意图

图8 合金锻后各道次取向成像图

图9 合金1道次锻造后孪生及未孪生晶粒取向成像图、{0001}极图及孪生与基面滑移Schmid因子分析

图10 合金2道次锻造后同一晶粒内的孪生及扭折现象分析

图11 合金3道次锻造后孪生晶粒取向成像图、极图及孪生变体Schmid因子分析

1	Ding W J. Magnesium Alloy Science and Technology [M]. Beijing: Science Press, 2007: 24
1	丁文江. 镁合金科学与技术 [M]. 北京: 科学出版社, 2007: 24
2	Dahle A K, Lee Y C, Nave M D, et al. Development of the as-cast microstructure in magnesium-aluminum alloys [J]. J. Light Met., 2001, 1: 61
3	Zhang J H, Leng Z, Liu S J, et al. Microstructure and mechanical properties of Mg-Gd-Dy-Zn alloy with long period stacking ordered structure or stacking faults [J]. J. Alloys Compd., 2011, 509: 7717
4	Polmear I J. Magnesium alloys and applications [J]. Mater. Sci. Technol., 1994, 10: 1
5	Zeng R C, Ke W, Xu Y B, et al. Recent development and application of magnesium alloys [J]. Acta Metall. Sin., 2001, 37: 673
5	曾荣昌, 柯伟, 徐永波等. Mg合金的最新发展及应用前景 [J]. 金属学报, 2001, 37: 673
6	Miura H, Maruoka T, Yang X, et al. Microstructure and mechanical properties of multi-directionally forged Mg-Al-Zn alloy [J]. Scr. Mater., 2012, 66: 49
7	Kawamura Y, Hayashi K, Inoue A, et al. Rapidly solidified powder metallurgy Mg₉₇Zn₁Y₂ alloys with excellent tensile yield strength above 600 MPa [J]. Mater. Trans., 2001, 42: 1172
8	Li Y X, Zhu G Z, Qiu D, et al. The intrinsic effect of long period stacking ordered phases on mechanical properties in Mg-RE based alloys [J]. J. Alloys Compd., 2016, 660: 252
9	Zhu J, Chen J B, Liu T, et al. High strength Mg₉₄Zn_2.4Y_3.6 alloy with long period stacking ordered structure prepared by near-rapid solidification technology [J]. Mater. Sci. Eng., 2017, A679: 476
10	Shao J B, Chen Z Y, Chen T, et al. Texture evolution, deformation mechanism and mechanical properties of the hot rolled Mg-Gd-Y-Zn-Zr alloy containing LPSO phase [J]. Mater. Sci. Eng., 2018, A731: 479
11	Xie G M, Ma Z Y, Xue P, et al. Effects of tool rotation rates on superplastic deformation behavior of friction stir processed Mg-Zn-Y-Zr alloy [J]. Acta Metall. Sin., 2018, 54: 1745
11	谢广明, 马宗义, 薛鹏等. 工具转速对搅拌摩擦加工Mg-Zn-Y-Zr耐热镁合金超塑性行为的影响 [J]. 金属学报, 2018, 54: 1745
12	Li K, Chen Z Y, Chen T, et al. Hot deformation and dynamic recrystallization behaviors of Mg-Gd-Zn alloy with LPSO phases [J]. J. Alloys Compd., 2019, 792: 894 doi: 10.1016/j.jallcom.2019.04.036
13	Matsuda M, Ando S, Nishida M, et al. Dislocation structure in rapidly solidified Mg₉₇Zn₁Y₂ alloy with long period stacking order phase [J]. Mater. Trans., 2005, 46: 361
14	Matsuda M, Ii S, Kawamura Y, et al. Interaction between long period stacking order phase and deformation twin in rapidly solidified Mg₉₇Zn₁Y₂ alloy [J]. Mater. Sci. Eng., 2004, A386: 447
15	Yamasaki M, Hagihara K, Inoue S I, et al. Crystallographic classification of kink bands in an extruded Mg-Zn-Y alloy using intragranular misorientation axis analysis [J]. Acta Mater., 2013, 61: 2065
16	Shao X H, Yang Z Q, Ma X L. Strengthening and toughening mechanisms in Mg-Zn-Y alloy with a long period stacking ordered structure [J]. Acta Mater., 2010, 58: 4760
17	Zhou X J, Liu C M, Gao Y H, et al. Evolution of LPSO phases and their effect on dynamic recrystallization in a Mg-Gd-Y-Zn-Zr alloy [J]. Metall. Mater. Trans., 2017, 48A: 3060 doi: 10.3390/ma11112092 pmid: 30366432
18	Zhang D X, Tan Z, Huo Q H, et al. Dynamic recrystallization behaviors of Mg-Gd-Y-Zn-Zr alloy with different morphologies and distributions of LPSO phases [J]. Mater. Sci. Eng., 2018, A715: 389
19	Miura H, Yu G, Yang X. Multi-directional forging of AZ61Mg alloy under decreasing temperature conditions and improvement of its mechanical properties[J]. Mater. Sci. Eng., 2011, A528: 6981
20	Wang B Z, Liu C M, Gao Y H, et al. Microstructure evolution and mechanical properties of Mg-Gd-Y-Ag-Zr alloy fabricated by multidirectional forging and ageing treatment [J]. Mater. Sci. Eng., 2017, A702: 22
21	Wu Y Z, Yan H G, Chen J H, et al. Microstructure and mechanical properties of ZK21 magnesium alloy fabricated by multiple forging at different strain rates [J]. Mater. Sci. Eng., 2012, A556: 164
22	Mehrabi A, Mahmudi R, Miura H. Superplasticity in a multi-directionally forged Mg-Li-Zn alloy [J]. Mater. Sci. Eng., 2019, A765: 138274
23	Deng L P, Cui K X, Wang B S, et al. Microstructure and texture evolution of AZ31 Mg alloy processed by multi-pass compressing under room temperature [J]. Acta Metall. Sin., 2019, 55: 976
23	邓丽萍, 崔凯旋, 汪炳叔等. AZ31镁合金室温多道次压缩过程微观组织和织构演变的研究 [J]. 金属学报, 2019, 55: 976
24	Matsuda M, Ii S, Kawamura Y, et al. Variation of long-period stacking order structures in rapidly solidified Mg₉₇Zn₁Y₂ alloy [J]. Mater. Sci. Eng., 2005, A393: 269
25	Yamasaki M, Sasaki M, Nishijima M, et al. Formation of 14H long period stacking ordered structure and profuse stacking faults in Mg-Zn-Gd alloys during isothermal aging at high temperature [J]. Acta Mater., 2007, 55: 6798 doi: 10.1016/j.actamat.2007.08.033
26	Xiao H C, Jiang S N, Tang B, et al. Hot deformation and dynamic recrystallization behaviors of Mg-Gd-Y-Zr alloy [J]. Mater. Sci. Eng., 2015, A628: 311
27	Guan D K, Rainforth W M, Ma L, et al. Twin recrystallization mechanisms and exceptional contribution to texture evolution during annealing in a magnesium alloy [J]. Acta Mater., 2017, 126: 132
28	Liu W, Zhang J S, Wei L Y, et al. Extensive dynamic recrystallized grains at kink boundary of 14H LPSO phase in extruded Mg₉₂Gd₃Zn₁Li₄ alloy [J]. Mater. Sci. Eng., 2017, A681: 97
29	Wu J, Ikeda K I, Shi Q, et al. Kink boundaries and their role in dynamic recrystallisation of a Mg-Zn-Y alloy [J]. Mater. Charact., 2019, 148: 233
30	Yu Y N. Metallurgical Principle [M]. 2nd Ed., Beijing: Metallurgical Industry Press, 2013: 931
30	余永宁. 金属学原理 [M]. 第2版. 北京: 冶金工业出版社, 2013: 931
31	Chapuis A, Xin Y C, Zhou X J, et al. {101¯2} twin variants selection mechanisms during twinning, re-twinning and detwinning [J]. Mater. Sci. Eng., 2014 ,A612: 431
32	Stanford N, Barnett M R. Effect of particles on the formation of deformation twins in a magnesium-based alloy [J]. Mater. Sci. Eng., 2009, A516: 226
33	Hong S G, Park S H, Lee C S. Role of {101¯2} twinning characteristics in the deformation behavior of a polycrystalline magnesium alloy [J]. Acta Mater., 2010, 58: 5873
34	Guo C F, Xin R L, Zheng X, et al. Influence of observation plane on twin variant identification in magnesium via trace and misorientation analysis [J]. Mater. Sci. Eng., 2014, A618: 558
35	Barnett M R. A Taylor model based description of the proof stress of magnesium AZ31 during hot working [J]. Metall. Mater. Trans., 2003, 34A: 1799
36	Chun Y B, Davies C H J. Investigation of prism <a> slip in warm-rolled AZ31 alloy [J]. Metall. Mater. Trans., 2011, 42A: 4113
37	Wang L, Sabisch J, Lilleodden E T. Kink formation and concomitant twin nucleation in Mg-Y [J]. Scr. Mater., 2016, 111: 68

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