正向挤压对Mg-5Sn-1.5Al-1Zn-1Si合金组织演化的影响
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摘要
研究了正向挤压对Mg-5Sn-1. 5Al-1Zn-1Si合金组织演化的影响。结果表明:在一定范围内,随着挤压比的增大,Mg-5Sn-1. 5Al-1Zn-1Si合金的晶粒均匀度升高,合金未发生再结晶的区域减小,较大的挤压比对细化晶粒、改善组织均匀性及动态再结晶有促进作用。挤压后粗大的化合物相得到有效破碎,但弥散程度不高,第二相颗粒呈现聚集状分布,挤压比较小时晶粒组织容易粗化。在300～380℃范围内,随着挤压温度的升高,Mg-5Sn-1. 5Al-1Zn-1Si合金的平均晶粒尺寸先减小后增大,但变化幅度平缓,采用340℃挤压时合金晶粒尺寸较均匀细小。破碎的第二相颗粒对晶粒长大具有抑制作用,并且挤压温度越高,相颗粒重新溶解的过程越快,对晶粒的抑制作用越明显,动态再结晶越完全。
Effect of forward extrusion on microstructure evolution of Mg-5Sn-1.5 Al-1Zn-1Si magnesium alloy was studied. The experimental results indicate that within a given range,the grain uniformity of Mg-5Sn-1.5Al-1Zn-1Si alloy is greatly improved with the extrusion ratio increasing,and the non recrystallized region decreases as well. The larger extrusion ratio can promote refining grain,microstructural homogeneity and dynamic recrystallization. For the alloys undergone forward extrusion,coarser compound phases are broken effectively,while their dispersion extent is not high and the second phase particles are in a kind of aggregation state,and the grain structure is coarsened easily with the small extrusion ratio. The average grain size of the alloy first decreases and then increases at 300-380 ℃,but the range is smoother,and the grain size is fine and uniform at 340 ℃. The broken second phase has inhibitory effect on grain growth,and the higher the extrusion temperature,the faster the dissolution process of phase particles. With the increase of temperature,it has inhibitory effect on grains,and the dynamic recrystal Iization is completed as well.
Effect of forward extrusion on microstructure evolution of Mg-5Sn-1.5 Al-1Zn-1Si magnesium alloy was studied. The experimental results indicate that within a given range,the grain uniformity of Mg-5Sn-1.5Al-1Zn-1Si alloy is greatly improved with the extrusion ratio increasing,and the non recrystallized region decreases as well. The larger extrusion ratio can promote refining grain,microstructural homogeneity and dynamic recrystallization. For the alloys undergone forward extrusion,coarser compound phases are broken effectively,while their dispersion extent is not high and the second phase particles are in a kind of aggregation state,and the grain structure is coarsened easily with the small extrusion ratio. The average grain size of the alloy first decreases and then increases at 300-380 ℃,but the range is smoother,and the grain size is fine and uniform at 340 ℃. The broken second phase has inhibitory effect on grain growth,and the higher the extrusion temperature,the faster the dissolution process of phase particles. With the increase of temperature,it has inhibitory effect on grains,and the dynamic recrystal Iization is completed as well.
引文
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[19]孙晶,李常金,刘云秋,等.Mg-8%Al-2%Ga镁合金的形变热处理[J].铸造,2014,63(4):317-320.Sun Jing,Li Changjin,Liu Yunqiu,et al.Thermo-mechanical treatment of Mg-8%Al-2%Ga magnesium alloy[J].Foundry,2014,63(4):317-320.
[2]Wang Q,Chen Y G,Xiao S F,et al.Study on microstructure and mechanical properties of as-cast Mg-Sn-Nd alloys[J].Journal of Rare Earths,2010,28(5):790-795.
[3]高爱华,张建新.热处理对往复挤压Mg-Sn-Al-Zn-Si合金组织与性能的影响[J].金属热处理,2018,43(1):215-220.Gao Aihua,Zhang Jianxin.Effect of heat treatment on microstructure and properties of reciprocating extrusion Mg-Sn-Al-Zn-Si magnesium alloy[J].Heat Treatment of Metals,2018,43(1):215-220.
[4]Tang S Q,Zhou J X,Tian C W,et al.Morphology modification of Mg2Si by Sr addition in Mg-4%Si alloy[J].Transactions of Nonferrous Metals Society of China,2011,21(9):1932-1935.
[5]陈君,李全安,李克杰,等.Sn对Mg-6Al-1.2Y-0.9Nd镁合金组织和性能的影响[J].稀有金属材料与工程,2010,39(7):1180-1183.Chen Jun,Li Quan’an,Li Kejie,et al.Effects of Sn on microstructures and mechanical properties of Mg-6Al-1.2Y-0.9Nd alloys[J].Rare Metal Materials and Engineering,2010,39(7):1180-1183.
[6]邱克强,郝帅,尤俊华,等.铸态Mg-Sn-Si-Sr合金的显微组织与力学性能[J].中国有色金属学报,2012,22(8):2148-2153.Qiu Keqiang,Hao Shuai,You Junhua,et al.Microstructure and mechanical properties of as-cast Mg-Sn-Si-Sr alloys[J].Transactions of Nonferrous Metals Society of China,2012,22(8):2148-2153.
[7]张国英,张辉,魏丹,等.Bi,Sb及稀土元素对AZ91镁合金高温性能影响机理研究[J].物理学报,2009,58(1):444-449.Zhang Guoying,Zhang Hui,Wei Dan,et al.The mechanism of the influence of Bi(or Sb)and rare earth on high temperature performance of AZ91 magnesium alloy[J].Acta Physica Sinica,2009,58(1):444-449.
[8]文九巴,王浩,贺俊光,等.Sm对AZ80镁合金组织和力学性能的影响[J].材料热处理学报,2014,35(2):47-50.Wen Jiuba,Wang Hao,He Junguang,et al.Influence of Sm addition on microstructure and mechanical properties of AZ80 magnesium alloys[J].Transactions of Materials and Heat Treatment,2014,35(2):47-50.
[9]Huang Z H,Qi W J,Xu J.Effect of microstructure on impact toughness of magnesium alloys[J].Transactions of Nonferrous Metals Society of China,2012,22(10):2334-2341.
[10]邱克强,石强,向青春,等.Zn对Mg-3Sn-1.5Si合金组织和时效硬化效果的影响[J].铸造,2015,64(5):385-389.Qiu Keqiang,Shi Qiang,Xiang Qingchun,et al.Effect of Zn addition on the microstructure and aging hardness of Mg-3Sn-1.5Si alloy[J].Foundry,2015,64(5):385-389.
[11]宋贵宏,孟雪,杨明川,等.Bi掺杂量对Mg-Si-Sn-Bi材料热电性能的影响[J].人工晶体学报,2016,45(12):2790-2794.Song Guihong,Meng Xue,Yang Mingchuan,et al.Efect of Bi doping content on the thermoelectric properties of Mg-Si-Sn-Bi materials[J].Journal of Synthetic Crystals,2016,45(12):2790-2794.
[12]张建新,王海燕,高爱华,等.Mg-Sn-Si系合金的热力学基础及合金相演变过程分析[J].物理学报,2015,64(6):1-6.Zhang Jianxin,Wang Haiyan,Gao Aihua,et al.Study on thermodynamics basic and alloy phase evolution of Mg-Sn-Si magnesium alloy[J].Acta Physica Sinica,2015,64(6):1-6.
[13]Suresh K,Rao K P,Prasad Y V R K,et al.Microstructure and mechanical properties of as-cast Mg-Sn-Ca alloys and effect of alloying elements[J].Transactions of Nonferrous Metals Society of China,2013,23(12):3604-3610.
[14]Geng H R,Wang Q L,Liu P,et al.Effects of P addition on the microstructure and mechanical properties of Mg-5%Sn-1.25%Si alloy[J].International Journal of Minerals,Metallurgy and Materials,2014,21(3):289-294.
[15]李艳辉,李保成,尹从娟.挤压比和挤压温度对AZ31镁合金组织性能的影响[J].金属世界,2008(3):10-12.Li Yanhui,Li Baocheng,Yin Congjuan.Effects of extrusion ratio and temperature on microstructure and properties of AZ31 magnesium alloy[J].Metal World,2008(3):10-12.
[16]曲家惠,李四军,张正贵,等.挤出和退火工艺对AZ31镁合金组织和织构的影响[J].中国有色金属学报,2007,17(3):434-440.Qu Jiahui,Li Sijun,Zhang Zhenggui,et al.Effect of extrusion and annealing technology on microstructure and texture of AZ31 magnesium alloy[J].The Chinese Journal of Nonferrous Metals,2007,17(3):434-440.
[17]毛卫民,赵新兵.金属的再结晶与晶粒长大[M].北京:冶金工业出版社,1994:57-68.
[18]张建新.铸态及变形Mg-Sn-Si合金的组织演化和强韧化[D].焦作:河南理工大学,2014.
[19]孙晶,李常金,刘云秋,等.Mg-8%Al-2%Ga镁合金的形变热处理[J].铸造,2014,63(4):317-320.Sun Jing,Li Changjin,Liu Yunqiu,et al.Thermo-mechanical treatment of Mg-8%Al-2%Ga magnesium alloy[J].Foundry,2014,63(4):317-320.