Mg-xSn合金的显微组织、热导率及力学性能研究
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摘要
研究了在镁中加入不同含量的Sn之后合金的显微组织、热导率和力学性能的变化规律。实验表明,在镁中加入Sn的含量小于5 wt%时,晶粒得到细化,当Sn含量大于5 wt%时,晶粒会出现粗化现象;当Sn含量增多时,合金中的第二相Mg_2Sn相逐渐增加并在晶界处逐渐连成网状。随Sn含量升高,合金的热导率逐渐下降,由Sn含量1 wt%时的141.58 W/m·K下降到Sn含量9 wt%时的65.94W/m·K.合金的极限抗拉强度和伸长率均随Sn含量增加先提高后降低,且在Sn含量5 wt%时达到最大值,分别为150.23 MPa和8.7%.
The effect of Sn on microstructure,thermal conductivity and mechanical properties were studied. The results show that while the content of Sn is less than 5 wt%,the grain of Mg-Sn alloys is refined. When the content of Sn is greater than 5 wt%,the grain will be larger. With Sn increasing,the Mg_2Sn phase is improving and is gradually in form of network structure along the grain boundary. The thermal conductivity of Mg-Sn alloy becomes more and more lower with the content of increasing Sn. It decreases from 141. 58 W/m · K to 65. 94 W/m · K when the content of Sn increases from 1 wt% to 9 wt%. The ultimate tensile strength(UTS) and elongation improve while the content of Sn is below 5 wt% and then reduce when the content of Sn is greater than 5 wt%. The maximum value of UTS and elongation are 150. 23 MPa 和 8. 7% when the content of Sn is 5 wt%.
The effect of Sn on microstructure,thermal conductivity and mechanical properties were studied. The results show that while the content of Sn is less than 5 wt%,the grain of Mg-Sn alloys is refined. When the content of Sn is greater than 5 wt%,the grain will be larger. With Sn increasing,the Mg_2Sn phase is improving and is gradually in form of network structure along the grain boundary. The thermal conductivity of Mg-Sn alloy becomes more and more lower with the content of increasing Sn. It decreases from 141. 58 W/m · K to 65. 94 W/m · K when the content of Sn increases from 1 wt% to 9 wt%. The ultimate tensile strength(UTS) and elongation improve while the content of Sn is below 5 wt% and then reduce when the content of Sn is greater than 5 wt%. The maximum value of UTS and elongation are 150. 23 MPa 和 8. 7% when the content of Sn is 5 wt%.
引文
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[3]潘虎成,潘复生,张磊,等.高电导率Mg-Al-Sr耐热镁合金的研究[J].稀有金属材料与工程,2015(3):727-732.
[4]张丁非,徐杏杏,齐福刚,等.Sn对ZM61合金组织与性能的影响[J].稀有金属材料与工程,2013,42(5):931-936.
[5]张亚琴,席亚娟,李远发,等.稀土镁合金的散热性能研究[J].特种铸造及有色合金,2015(5):463-465.
[6]陈鹏,黄庆学,马立峰,等.镁合金板带厚度对开轧温度场影响研究[J].太原科技大学学报,2015,(6):455-459.
[7]李正祥,王金辉,金培鹏,等.Sn对镁合金显微组织和力学性能的影响[J].铸造技术,2015,36(10):2406-2410.
[8]刘红梅,陈云桂,唐永柏,等.热处理对Mg-5 wt%Sn合金组织与显微硬度的影响[J].材料热处理学报,2007,28(1):92-95.
[9]黄正华,戚文军,徐静,等.铸态和固溶态Mg-Sn二元合金的组织与力学性能[J].材料研究与应用,2014(4):221-227.
[10]袁家伟.高导热Mg-Zn-Mn合金及其性能研究[D].北京:北京有色金属研究总院,2013.
[11]TANG Y Q,CHEN Y G,XIAO S F,et al.Microstructure,Mechanical Properties and Compressive Creep Behavior of as-Cast Mg-5Sn-(0-2)Cu Alloys[J].Rare Metal Materials and Engineering,2014,43(6):1291-1295.
[12]PENG J,ZHONG L P,WANG Y J,et al.Effect of Ce addition on thermal conductivity of Mg-2Zn-1Mn alloy[J].Journal of Alloys and Compounds,2015,639(5):556-562.
[13]游国强,白世磊,明玥,等.镁合金导热性能研究进展[J].功能材料,2016,47(5):30-35.
[14]YING T,ZHENG M Y,LI Z T,et al.Thermal conductivity of as-cast and as-extruded binary Mg-Al alloys[J].Journal of Alloys and Compounds,2014,608(38):19-24.
[15]YING T,ZHENG M Y,LI Z T,et al.Thermal conductivity of as-cast and as-extruded binary Mg-Zn alloys[J].Journal of Alloys and Compounds,2015,621(38):421-432
[16]胡赓祥,钱苗根.金属学[M].上海:上海科学技术出版社,1980.