n-SiC_p含量对铸态Mg-9Al-1Si镁合金组织和性能的影响
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摘要
采用半固态搅拌+超声处理的方法制备了Mg-9Al-1Si合金和Mg-9Al-1Si-xn-SiC_p(x=0, 0.5%,1%,1.5%和2%)复合材料,利用OM、SEM及室温拉伸等方法研究了显微组织与力学性能。研究表明,半固态搅拌与超声处理复合法可以将n-SiC_p引入到Mg-9Al-1Si合金中,并实现较为均匀的分布;当n-SiC_p含量超过1%时,n-SiC_p出现少量团聚。随n-SiC_p含量的增加,Mg-9Al-1Si合金的基体晶粒尺寸减小、Mg_2Si相显著细化,β-Mg_17Al_12相尺寸变小,并且由连续网状分布变为不连续网状分布;随n-SiC_p含量增加,复合材料的抗拉强度、屈服强度、伸长率呈现先增后减的趋势;n-SiC_p含量为1%时,性能较佳。
Mg-9 Al-1 Si alloy and Mg-9 Al-1 Si-xn-SiC(x=0, 0.5,1,1.5 and 2%) composite were prepared by semi-solid stirring and ultrasonic treatment. Optical microscope(OM), scanning electron microscope(SEM) and tensile test were employed to investigate the effect of the addition of n-SiC_pon the microstructure and mechanical properties of Mg-9 Al-1 Si alloy. The results show that Si Cpcould be introduced into the semisolid melting and distributed uniformly by the method of ultrasonic semi-solid stirring. It is worth noting that the n-SiC_p are prone to aggregation as the content of 1% Si C p. In addition, the introduction of n-SiC_pcould lead to the refinement of the matrix grains and Mg_2 Si particles. The particle size of β-Mg_17 Al_12 is decreased significantly, and the net-liked β-Mg_17 Al_12 cracked simultaneously. The mechanical properties of Mg-9 Al-1 Si-xn-SiC composite improve remarkedly compared with that of Mg-9 Al-1 Si alloy, the ultimate tensile strength,yield strength and elongation of the composites tended to increase first and then decrease with the increasing of n-SiC_p content. And when the composite contain 1%n-SiC_p, the value of the mechanical properties reach the maximum.
Mg-9 Al-1 Si alloy and Mg-9 Al-1 Si-xn-SiC(x=0, 0.5,1,1.5 and 2%) composite were prepared by semi-solid stirring and ultrasonic treatment. Optical microscope(OM), scanning electron microscope(SEM) and tensile test were employed to investigate the effect of the addition of n-SiC_pon the microstructure and mechanical properties of Mg-9 Al-1 Si alloy. The results show that Si Cpcould be introduced into the semisolid melting and distributed uniformly by the method of ultrasonic semi-solid stirring. It is worth noting that the n-SiC_p are prone to aggregation as the content of 1% Si C p. In addition, the introduction of n-SiC_pcould lead to the refinement of the matrix grains and Mg_2 Si particles. The particle size of β-Mg_17 Al_12 is decreased significantly, and the net-liked β-Mg_17 Al_12 cracked simultaneously. The mechanical properties of Mg-9 Al-1 Si-xn-SiC composite improve remarkedly compared with that of Mg-9 Al-1 Si alloy, the ultimate tensile strength,yield strength and elongation of the composites tended to increase first and then decrease with the increasing of n-SiC_p content. And when the composite contain 1%n-SiC_p, the value of the mechanical properties reach the maximum.
引文
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[14] Nie K B, Wang X J, Wu K, et al. Development of SiCp/AZ91 magnesium matrix nanocomposites using ultrasonic vibration[J].Materials Science and Engineering:A, 2012, 540:123-129.
[15]何广进,李文珍.纳米颗粒分布对镁基复合材料强化机制的影响[J].复合材料学报,2013,30(2):105-110.
[2]贾俊豪,梁伟,韩富银.等通道挤压Mg2Si增强ZK60镁合金的显微组织及力学性能[J].稀有金属材料与工程,2013,42(6):1268-1273.
[3] Yang M B, Pan F S, Shen J. Comparison of Sb and Sr on modification and refinement of Mg2Si phase in AZ61-0.7Si magnesium alloy[J]. Transactions of Nonferrous Metals Society of China, 2009,19(2):287-292.
[4]张月,李青春,石玲. Nd、Ti、B复合变质对Al-18Mg2Si合金组织与性能的影响[J].特种铸造及有色合金, 2017,37(5):545-549.
[5] Bian L, Ling W, Xie G. Enhanced ductility in an Al-Mg2Si in situ composite processed by ECAP using a modified BC route[J]. Materials Science and Engineering:A, 2011, 528(9):3463-3467.
[6]胡义锋,白光珠,余昭福.超声波和T6处理对原位自生Mg2Si/Al复合材料微观组织与摩擦磨损性能的影响[J].热加工工艺, 2017,46(10):130-135.
[7] Huang S J, Ali A N. Effects of heat treatment on the microstructure and microplastic deformation behavior of SiC particles reinforced AZ61 magnesium metal matrix composite[J]. Materials Science and Engineering:A, 2018, 711:670-682.
[8]王志文,王红霞,王万华.超声处理对Mg-9Al-x Si(x=1, 6)合金不同形貌Mg2Si相形成机制的影响[J].哈尔滨工程大学学报,2017, 38(5):803-807.
[9] Yu Guang Z, Xiao Bo L, YuanYuan Y, et al. Effect of SiC particle addition on microstructure of Mg2Si/Al composite[J]. China Foundry, 2014, 11(02):91-97.
[10]刘亚虎,蔡雪原,朱延超,等.纳米碳化硅颗粒的团聚及分散的研究进展[J].材料工程,2013,(9):84-90.
[11] Nie K B, Wang X J, Wu K, et al. Processing, microstructure and mechanical properties of magnesium matrix nanocomposites fabricated by semisolid stirring assisted ultrasonic vibration[J]. Journal of Alloys and Compounds, 2011, 509(35):8664-8669.
[12]刘世英,李文珍,高飞鹏,等.高能超声处理在制备纳米SiC颗粒增强镁基复合材料中的作用[J].铸造,2009,58(3):210-212,216.
[13]胡志,闫洪,聂俏,等.超声法制备纳米SiC颗粒增强AZ61镁基复合材料的显微组织[J].中国有色金属学报,2009,19(5):841-846.
[14] Nie K B, Wang X J, Wu K, et al. Development of SiCp/AZ91 magnesium matrix nanocomposites using ultrasonic vibration[J].Materials Science and Engineering:A, 2012, 540:123-129.
[15]何广进,李文珍.纳米颗粒分布对镁基复合材料强化机制的影响[J].复合材料学报,2013,30(2):105-110.