固溶和冷却处理对Mg-Dy-Ni合金中长程堆垛有序(LPSO)相形貌及析出硬化行为的影响（英文）
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摘要
研究了固溶和冷却处理对Mg-2Dy-0.5Ni(摩尔分数,%)合金中的长程堆垛有序(LPSO)相形貌及析出硬化行为的影响。铸态合金组织主要包括α-Mg相、分布在枝晶间具有LPSO结构的竹尖状Mg_(12)DyNi相和少量立方体状的Dy相。在565℃固溶处理12 h及随后不同的冷却过程中,点状、块状、细薄片状和棒状的LPSO相分别在基体中析出。在连续冷却(空冷和炉冷)的条件下,细薄片状的LPSO相逐渐在晶粒内部析出;随着冷却时间的延长,其体积分数亦增加,且块状的LPSO相发生粗化。在不连续冷却(炉冷到415℃+空冷和炉冷到265℃+空冷)条件下,点状LPSO相生长成棒状相,降低了合金的冷却硬化作用。
Effects of solid solution treatment and cooling on the morphology of long period stacking order(LPSO) phase and precipitation hardening behavior of Mg-2 Dy-0.5 Ni(molar fraction, %) alloy were investigated. Microstructures of the as-cast alloy mainly consisted of α-Mg phase, bamboo-like Mg12 Dy Ni phase with LPSO structure distributed between dendrites and small amounts of cubic Dy phases. During solid solution treatment at 565 ℃ for 12 h and subsequent different cooling conditions, dot-shaped, block, fine lamellar and rod-shaped LPSO phases precipitate in Mg matrix, respectively. For continuous cooling conditions(furnace and air cooling), the fine lamellar LPSO phase generally forms in grain interior and its volume fraction increases and block LPSO phase coarsens with increasing cooling time. For discontinuous cooling conditions(air cooling after furnace cooling to 415 and 265 ℃), the dot-shaped LPSO grows into the rod-shaped phase, which results in an decrease of cooling hardening behavior of alloy.
Effects of solid solution treatment and cooling on the morphology of long period stacking order(LPSO) phase and precipitation hardening behavior of Mg-2 Dy-0.5 Ni(molar fraction, %) alloy were investigated. Microstructures of the as-cast alloy mainly consisted of α-Mg phase, bamboo-like Mg12 Dy Ni phase with LPSO structure distributed between dendrites and small amounts of cubic Dy phases. During solid solution treatment at 565 ℃ for 12 h and subsequent different cooling conditions, dot-shaped, block, fine lamellar and rod-shaped LPSO phases precipitate in Mg matrix, respectively. For continuous cooling conditions(furnace and air cooling), the fine lamellar LPSO phase generally forms in grain interior and its volume fraction increases and block LPSO phase coarsens with increasing cooling time. For discontinuous cooling conditions(air cooling after furnace cooling to 415 and 265 ℃), the dot-shaped LPSO grows into the rod-shaped phase, which results in an decrease of cooling hardening behavior of alloy.
引文
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[27]DING Wen-jiang,WU Yu-juan,PENG Li-ming,ZENG Xiao-qin,YUAN Guang-yin,LIN Dong-liang.Formation of 14H-type long period stacking ordered structure in the as-cast and solid solution treated Mg-Gd-Zn-Zr alloys[J].Materials Research Society,2009,24(5):1842-1854.
[28]BI Guang-li,FANG Da-qing,ZHAN Lei,ZHANG Qing-xin,LIAN Jian-she,JIANG Qing,JIANG Zhong-hao.Double-peak ageing behavior of Mg-2Dy-0.5Zn alloy[J].Journal of Alloys and Compounds,2011,509:8286-8275.
[29]QIN De-zhao,WANG Jing-feng,LU Ruo-peng,CHEN Yong-liang,MA She,PAN Fu-sheng.Effects of heat treatment on the morphology of long-period stacking ordered phase and the corresponding damping capacities of Mg-Cu-Zn-Y alloys[J].Materials Transactions,2015,12(12):2042-2046.
[30]ZHU Y M,WEYLAND M,MORTON A J,OH-ISHI K,HONO K,NIE J F.The building block of long-period structures in Mg-RE-Zn alloys[J].Scripta Materialia,2009,60:980-983.
[31]SHAO Xiao-hong,YANG Zhi-qing,MA Xiu-liang.Strengthening and toughening mechanisms in Mg-Zn-Y allou with a long period stacking ordered structure[J].Acta Materialia,2010,58(14):4760-4771.
[2]LI Ji-lin,CHEN Rong-shi,KE Wei.Microstructure and mechanical properties of Mg-Gd-Y-Zr alloy cast by metal mould and lost foam casting[J].Transactions of Nonferrous Metals Society of China,2011,21(4):761-766.
[3]YANG Ming-bo,QIN Cai-yuan,PAN Fu-sheng,ZHOU Tao.Comparison of effects of cerium,yttrium and gadolinium additions on as-cast microstructure and mechanical properties of Mg-3Sn-1Mn magnesium alloy[J].Journal of Rare Earths,2011,29(6):550-557.
[4]ZHANG Kui,LI Xing-gang,LI Yong-jun,MA Ming-long.Effect of Gd content on microstructure and mechanical properties of Mg-Y-RE-Zr alloys[J].Transactions of Nonferrous Metals Society of China,2008,18(S):s12-s16.
[5]LIU Xi-bo,GUAN Xun,CHEN Rong-shi,HAN En-hou.Creep behavior of ageing hardened Mg-10Gd-3Y alloy[J].Transactions of Nonferrous Metals Society of China,2010,20(S):s545-s549.
[6]KAWAMURA Y,HAYASHI K,INOUE A,MASUMOTO T.Rapidly solidified powder metallurgy Mg97Zn1Y2 alloy with excellent tensile yield strength above 600 MPa[J].Materials Transactions,2001,42(7):1172-1176.
[7]ABE E,KAWAMURA Y,HAYASHI K,INOUE A.Long-period ordered structure in a high-strength nanocrystalline Mg-1at%Zn-2at%Y alloy studied by stomic-resolution Z-contrast stem[J].Acta Materialia,2002,50(15):3845-3857.
[8]INOUE A,KAWAMURA Y,MATSUSHITA M,HAYASHI K,KOIKE J.Novel hexagonal structure and ultrahigh strength of magnesium solid solution in the Mg-Zn-Y system[J].Journal of Materials Research,2001,16(7):1894-1900.
[9]ZHU Y M,MORTON A J,NIE J F.The 18R and 14H long-period stacking ordered structures in Mg-Y-Zn alloys[J].Acta Materialia,2010,58(8):2936-2947.
[10]ITOI T,SEIMIYA T,KAWAMURA Y,HIROHASHI M.Long period stacking structure observed in Mg97Zn1Y2 alloy[J].Scripta Materialia,2004,51(2):107-111.
[11]YAMASAKI M,ANAN T,TOSHIMOTO S,KAWAMURA Y.Mechanical properties of warm-extruded Mg-Zn-Gd alloy with coherent 14H long periodic stacking ordered structure precipitate[J].Scripta Materialia,2005,53(7):799-803.
[12]YAMASAKI M,SASAKI M,NISHIJIMA M,HIRAGA K,KAWAMURA Y.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 Materialia,2007,55(20):6798-6805.
[13]LIU Ke,ZHANG Jing-huai,TANG Ding-xiang,ROKHLIN L L,ELKIN F M,MENG Jian.Precipitates formed in a Mg-7Y-4Gd-0.5Zn-0.4Zr alloy during isothermal ageing at 250°C[J].Materials Chemistry and Physics,2009,117:107-112.
[14]WANG Jie,ZHANG Jin-shan,ZONG Xi-mei,XU Chun-xiang,YOU Zhi-yong.Effects of Ca on the formation of LPSO phase and mechanical properties of Mg-Zn-Y-Mn alloy[J].Materials Science and Engineering A,2015,648:37-40.
[15]ZHANG Jin-shan,XIN Chao,NIE Kai-bo,CHENG Wei-li,WANG Hong-xia,XU Chun-xiang.Microstructure and mechanical properties of Mg-Zn-Dy-Zr alloy with long-period stacking ordered phases by heat treatments and ECAP process[J].Materials Science and Engineering A,2014,611:108-113.
[16]LU Ruo-peng,WANG Jing-feng,CHEN Yong-liang,QIN De-zhao,YANG Wen-xiang,WU Zhong-shan.Effect of heat treatment on the morphology of long-period stacking ordered phase,the corresponding damping capacities and mechanical properties of Mg-Zn-Y alloys[J].Journal of Alloys and Compounds,2015,639:541-546.
[17]BI Guang-li,LI Yuan-dong,HUANG Xiao-feng,CHEN Ti-jun,LIAN Jian-she,JIANG Zhong-hao,MA Ying,HAO Yuan.Deformation behavior of an extruded Mg-Dy-Zn alloy with long period stacking ordered phase[J].Materials Science and Engineering A,2015,622:52-60.
[18]ZHENG Liang,LIU Chu-ming,JIN Jin,WANG Xiao,JI Da-wei.Effect of hot-rolling on microstructures and mechanical properties of extruded Mg-6Gd-3.2Y-x Zn-o.5Zr sheet[J].Journal of Materials Engineering and Performance,2013,22:104-111.
[19]NODA M,MATSUMOTO R,KAWAMURA Y.Forging induces changes in the formability and microstructure of extruded Mg96Zn2Y2alloy with a long-period stacking order phase[J].Materials Science and Engineering A,2013,563:21-27.
[20]LIU Huan,BAI Jing,YAN Kai,YAN Jing-li,MA Ai-bin,JIANG Jing-hua.Comparative studies on evolution behavior of 14H LPSO precipitates in as-cast and as-extruded Mg-Y-Zn alloys during annealing at 773 K[J].Materials and Design,2016,93:9-18.
[21]BI Guang-li,LUO Xiao-mei,JIANG Jing,ZHANG Yong-gang,XU Jian-ji,CHEN Jie-ming,LI Yuan-dong,MA Ying.Effect of Zn,Cu and Ni addition on microstructure and mechanical properties of as-cast Mg-Dy alloy[J].China Foundry,2016,13(1):54-58.
[22]ZHANG Fan,BI Guang-li,LI Yuan-dong,LI Ming,MA Ying.Effect of solution treatment on microstructure and corrosion properties of Mg-Dy-Zn alloy[J].Transactions of Materials and Heat,2015,36(4):85-92.
[23]BI Guang-li,LI Yuan-dong,HUANG Xiao-feng,CHEN Ti-jun,MA Ying,HAO Yuan.Dry sliding wear behavior of an extruded Mg-Dy-Zn alloy with long period stacking ordered phase[J].Journal of Magnesium Alloy,2015,3:63-69.
[24]HAGIHARA K,YOKOTANI N,UMAKOSHI Y.Plastic deformation behavior of Mg12YZn with 18R long-period stacking ordered structure[J].Intermetallics,2010,18:267-276.
[25]ZHANG Jin-shan,XIN Chao,CHENG Wei-li,BIAN Li-ping,WANG Hong-xia,XU Chun-xiang.Research on long-periodstacking-ordered in Mg-Zn-Dy-Zr alloy[J].Journal of Alloys and Compounds,2013,558:195-202.
[26]WU Yu-juan,ZENG Xiao-qin,LIN Dong-liang,PENG Li-ming,DING Wwen-jiang.The microstructure evolution with lamellar14H-type LPSO structure in an Mg96.5Gd2.5Zn1 alloy during solid solution heat treatment at 773 K[J].Journal of Alloys and Compounds,2009,477:193-197.
[27]DING Wen-jiang,WU Yu-juan,PENG Li-ming,ZENG Xiao-qin,YUAN Guang-yin,LIN Dong-liang.Formation of 14H-type long period stacking ordered structure in the as-cast and solid solution treated Mg-Gd-Zn-Zr alloys[J].Materials Research Society,2009,24(5):1842-1854.
[28]BI Guang-li,FANG Da-qing,ZHAN Lei,ZHANG Qing-xin,LIAN Jian-she,JIANG Qing,JIANG Zhong-hao.Double-peak ageing behavior of Mg-2Dy-0.5Zn alloy[J].Journal of Alloys and Compounds,2011,509:8286-8275.
[29]QIN De-zhao,WANG Jing-feng,LU Ruo-peng,CHEN Yong-liang,MA She,PAN Fu-sheng.Effects of heat treatment on the morphology of long-period stacking ordered phase and the corresponding damping capacities of Mg-Cu-Zn-Y alloys[J].Materials Transactions,2015,12(12):2042-2046.
[30]ZHU Y M,WEYLAND M,MORTON A J,OH-ISHI K,HONO K,NIE J F.The building block of long-period structures in Mg-RE-Zn alloys[J].Scripta Materialia,2009,60:980-983.
[31]SHAO Xiao-hong,YANG Zhi-qing,MA Xiu-liang.Strengthening and toughening mechanisms in Mg-Zn-Y allou with a long period stacking ordered structure[J].Acta Materialia,2010,58(14):4760-4771.