含长周期结构Mg-(2, 3, 4)Y-1Zn合金的显微组织和力学性能

刘欢; 薛烽; 白晶; 周健; 孙扬善

doi:10.3724/SP.J.1037.2012.00548

金属学报 >

2013 , Vol. 49 >Issue 2: 236 - 242

DOI: https://doi.org/10.3724/SP.J.1037.2012.00548

论文

含长周期结构Mg-(2, 3, 4)Y-1Zn合金的显微组织和力学性能

刘欢 ,
薛烽 ,
白晶 ,
周健 ,
孙扬善

展开

东南大学材料科学与工程学院江苏省先进金属材料高技术研究重点实验室, 南京 211189

刘欢, 男, 1987年生, 博士生

收稿日期: 2012-09-14

修回日期: 2012-12-01

网络出版日期: 2013-02-11

基金资助

江苏省自然科学基金资助项目BK2010392

收起

MICROSTRUCTURES AND MECHANICAL PROPERTIES OF Mg-(2, 3, 4)Y-1Zn ALLOYS WITH LONG PERIOD STACKING ORDERED STRUCTURE

LIU Huan ,
XUE Feng ,
BAI Jing ,
ZHOU Jian ,
SUN Yangshan

Expand

Jiangsu Key Lab for Advanced Metallic Materials, College of Materials Science and Engineering, Southeast University,Nanjing 211189

Received date: 2012-09-14

Revised date: 2012-12-01

Online published: 2013-02-11

Fold

摘要

制备并研究了Mg-(2, 3, 4)Y-1Zn(原子分数, %)三元合金在铸态、退火、挤压和固溶处理时的显微组织和力学性能. 结果表明, 随着Y/Zn原子比的升高, 铸态合金的显微组织由WZ21和WZ31合金的两相组织(α-Mg+Mg₁₂YZn)转变为WZ41合金的三相组织(α-Mg+Mg₁₂YZn+Mg₂₄Y₅).其中Mg₁₂YZn相连接成网状, 为18R-LPSO结构, Mg₂₄Y₅相分布于Mg₁₂YZn相之间. 退火时, WZ21和WZ31合金中部分18R相溶解, 基体中析出大量14H-LPSO层片. 经过挤压, 18R-LPSO相沿挤压方向呈带状排列,退火析出的14H层片整体平动, 在α-Mg中仍相互平行. 固溶处理后, 18R相继续溶解, 14H相析出并长大. 此时, 随Y/Zn原子比升高, 合金中14-LPSO相体积分数增加. 3种合金挤压态的性能优于相应的铸态、退火态和固溶处理态, 随着Y含量的增加, 合金强度不断升高, 塑性下降, 挤压态WZ41合金在室温时抗拉强度达到350 MPa以上.

关键词： Mg-Y-Zn合金; 长周期堆垛有序结构; 退火; 挤压; 固溶处理

本文引用格式

刘欢 , 薛烽 , 白晶 , 周健 , 孙扬善 . 含长周期结构Mg-(2, 3, 4)Y-1Zn合金的显微组织和力学性能[J]. 金属学报, 2013 , 49(2) : 236 -242 . DOI: 10.3724/SP.J.1037.2012.00548

Abstract

Recently, the Mg-Y-Zn alloy systems have received great attention due to their unique microstructures and excellent mechanical properties. Three kinds of ternary equilibrium Mg-Y-Zn phases have been reported in the systems: the W phase (Mg₃Y₂Zn₃), the I phase (Mg₃YZn₆) and the X phase (Mg₁₂YZn, long period stacking ordered (LPSO)structure). To further study the evolutions of LPSO structures in Mg-Y-Zn alloys, three Mg-(2, 3, 4)Y-1Zn (atomic fraction, %) ternary alloys were prepared by casting and extrusion. Based on the OM, SEM and TEM observations, the microstructures of the as-cast WZ21 and WZ31 alloys are mainly composed ofα-Mg and Mg₁₂YZn duplex microstructures, while that of the as-cast WZ41 alloy consists of α-Mg,Mg₁₂YZn and Mg₂₄Y₅ phases. The Mg₁₂YZn phase which forms a network is a kind of 18R-LPSO structures and the Mg₂₄Y₅ phase is inclined to be located within 18R phases. During homogenization treatment, part of 18R phase dissolves and 14H lamellas are precipitated in the matrix of the WZ21 and WZ31 alloys. After extrusion, the 18R phases are aligned along the extrusion direction, whereas the 14H lamellas in the matrix are still parallel to each other. During solution treatment (T4), the 18R structures continue to dissolve and 14H lamellas further develop. With increase of the Y/Zn atomic ratio, the volume fraction of 14H-LPSO phase increases after T4 treatment. The mechanical properties for the extruded alloys are better than alloys in as-cast, as-annealed and T4-treated stages. With increasing Y content, the strength of the alloys increases, but the ductility decreases. Tensile strength of the extruded WZ41 alloy reaches 350 MPa at room temperature.

Key words： Mg-Y-Zn alloy; long period stacking ordered structure; annealing; extrusion; solution treatment

参考文献

[1] Zhang J H, Leng Z, Liu S J, Li J Q, Zhang M L, Wu R Z. J Alloys Compd, 2011; 509: 7717

[2] Kawamura Y, Hayashi K, Inoue A, Masumoto T. Mater Trans, 2001; 42: 1172

[3] Luo S Q, Tang A T, Pan F S, Song K, Wang W Q. Trans Nonferrous Met Soc China, 2011; 21: 795

[4] Wang J F, Song P F, Gao S, Huang X F, Shi Z Z, Pan F S. Mater Sci Eng, 2011; A528: 5914

[5] Liu K, Zhang J H, Lu H Y, Tang D X, Rokhlin L L, Elkin F M, Meng J. Mater Des, 2010; 31: 210

[6] Zhang S, Yuan G Y, Lu C, Ding W J. J Alloys Compd, 2011; 509: 3515

[7] Yin D D, Wang Q D, Gao Y, Chen C J, Zheng J. J Alloys Compd, 2011; 509: 1696

[8] Abe E, Kawamura Y, Hayashi K, Inoue A. Acta Mater, 2002; 50: 3845

[9] Zheng L, Liu C M, Wan Y C, Yang P W, Shu X. J Alloys Compd, 2011; 509: 8832

[10] Kawamura Y, Kasahara T, Izumi S, Yamasaki M. Scr Mater, 2006; 55: 453

[11] Itoi T, Seimiya T, Kawamura Y, Hirohashi M. Scr Mater, 2004; 51: 107

[12] Li R G, Fang D Q, An J, Lu Y, Cao Z Y, Liu Y B. Mater Charact, 2009; 60: 470

[13] Yamasaki M, Anan T, Yoshimoto S, Kawamura Y. Scr Mater, 2005; 53: 799

[14] Su Z G, Li R G, An J, Lu Y. J Mater Eng Perform, 2010; 19: 70

[15] Chen B, Lin D L, Zeng X Q, Lu C. J Alloys Compd, 2007; 440: 94

[16] Yoshimoto S, Yamasaki M, Kawamura Y. Mater Trans, 2006; 47: 959

[17] Wang J F, Gao S, Song P F, Huang X F, Shi Z Z, Pan F S. J Alloys Compd, 2011; 509: 8567

[18] Chen B, Lin D L, Zeng X Q, Lu C. J Mater Sci, 2010; 45: 2510

[19] Yamasaki M, Sasaki M, Nishijima M, Hiraga K, Kawamura Y. Acta Mater, 2007; 55: 6798

[20] Zhu Y M, Weyland M, Morton A J, Oh-ishi K, Hono K, Nie J F. Scr Mater, 2009; 60: 980

[21] Zhu Y M, Morton A J, Nie J F. Acta Mater, 2010; 58: 2936

[22] Li D J, Zeng X Q, Dong J, Zhai C Q. Trans Nonferrous Met Soc China, 2008; 18: 117

[23] Zeng X Q, Wu Y J, Peng L M, Lin D L, Ding W J, Peng Y H. Acta Matell Sin, 2010; 46: 1041

(曾小勤, 吴玉娟, 彭立明, 林栋樑, 丁文江, 彭赢红. 金属学报, 2010; 46: 1041)

[24] Liu K, Zhang J F, Tang D X, Rokhlin L L, Elkin F M, Meng J. Mater Chem Phys, 2009; 117: 107

[25] Hagihara K, Kinoshita A, Sugino Y, Yamasaki M, Kawamura Y, Yasuda H Y, Umakoshi Y. Acta Mater, 2010; 58: 6282

[26] Shao X H, Yang Z Q, Ma X L. Acta Mater, 2010; 58: 4760

Options

文章导航

模态框（Modal）标题

摘要

本文引用格式

Abstract

参考文献