微量CaO对Mg-2Zn-0.5Sr医用镁合金显微组织、力学性能及抗腐蚀性能的影响
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摘要
以Mg-2Zn-0.5Sr合金为基体,采用搅拌熔炼制备含微量CaO颗粒(0.1%、0.3%,质量分数,下同)的复合材料。均匀化热处理后,观察显微组织,测试力学性能,研究材料在Kokubo模拟体液中的腐蚀性能。结果发现,CaO颗粒机械地富集于晶界及晶粒内的第二相与基体之间,使Mg-2Zn-0.5Sr合金晶粒细化,强度提高,但对塑性影响不一。CaO颗粒的添加使Mg-2Zn-0.5Sr合金腐蚀电位正移。浸泡实验表明,Mg-2Zn-0.5Sr的腐蚀速率为11.74 mm/a,0.1%CaO使腐蚀速率降低约18.2%,而0.3%CaO使腐蚀速率增高约52.0%。综合表明,Mg-2Zn-0.5Sr/0.1CaO表现出较高的强度和较佳的耐腐蚀性能。
We selected Mg-2 Zn-0.5 Sr as matrix materials and CaO particles as composite inclusions to produce Mg-2 Zn-0.5 Sr/CaO biocomposites containing trace CaO particles(0 wt%, 0.1 wt% and 0.3 wt%) through stirring and smelting. The microstructure, mechanical properties, and bio-corrosion behavior of experimental materials were investigated after homogenizing treatments. It is found that the CaO particles are mainly enriched at grain boundaries and between the second phases and the α-Mg matrix. It leads to grain refinement and strength improvement, but has different effects on the plasticity of materials. The corrosion potential(Ecorr) of Mg-2 Zn-0.5 Sr/CaO composites significantly shifts in a more positive direction when CaO particles are added to Mg-2 Zn-0.5 Sr. Immersion tests show that the average corrosion rate of Mg-2 Zn-0.5 Sr is 11.74 mm/a. When adding 0.1 wt% CaO, the corrosion rate decreases by about 18.2%, and when adding 0.3 wt% CaO, the corrosion rate increases by about 52.0%. Our analysis shows that the Mg-2 Zn-0.5 Sr/0.1 CaO has good strength and corrosion resistance.
We selected Mg-2 Zn-0.5 Sr as matrix materials and CaO particles as composite inclusions to produce Mg-2 Zn-0.5 Sr/CaO biocomposites containing trace CaO particles(0 wt%, 0.1 wt% and 0.3 wt%) through stirring and smelting. The microstructure, mechanical properties, and bio-corrosion behavior of experimental materials were investigated after homogenizing treatments. It is found that the CaO particles are mainly enriched at grain boundaries and between the second phases and the α-Mg matrix. It leads to grain refinement and strength improvement, but has different effects on the plasticity of materials. The corrosion potential(Ecorr) of Mg-2 Zn-0.5 Sr/CaO composites significantly shifts in a more positive direction when CaO particles are added to Mg-2 Zn-0.5 Sr. Immersion tests show that the average corrosion rate of Mg-2 Zn-0.5 Sr is 11.74 mm/a. When adding 0.1 wt% CaO, the corrosion rate decreases by about 18.2%, and when adding 0.3 wt% CaO, the corrosion rate increases by about 52.0%. Our analysis shows that the Mg-2 Zn-0.5 Sr/0.1 CaO has good strength and corrosion resistance.
引文
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[2]Zhang Xiaobo(章晓波),Ma Qinglong(马青龙),Ba Zhixin(巴志新)et al.Rare Metal Materials and Engineering(稀有金属材料与工程)[J],2017,46(4):1156
[3]Qi Wenjun(戚文军),Gong Xiaoyi(龚晓毅),Huang Zhenghua(黄正华).Rare Metal Materials and Engineering(稀有金属材料与工程)[J],2016,45(10):2609
[4]Li Zijian,Gu Xuenan,Lou Siquan et al.Biomaterials[J],2008,29(10):1329
[5]Li Nan,Zheng Yufeng.Journal of Materials Science&Technology[J],2013,29(6):489
[6]Alvarez-Lopez M,Pereda M D,Del Valle J A et al.Acta Biomaterialia[J],2010,6(5):1763
[7]Migliaresi C,Nicolais L.The International Journal of Artificial Organs[J],1980,3(2):114
[8]Gu Xuenan,Zhou Weirui,Zheng Yufeng et al.Materials Science and Engineering C[J],2010,30(6):827
[9]Witte F,Feyerabend F,Maier P et al.Biomaterials[J],2007,28(13):2163
[10]El-Rahman S S A.Pharmacological Research[J],2003,47(3):189
[11]Liu Yichi,Liu Debao,Liu Linbo et al.Rare Metal Materials and Engineering[J],2014,43(S1):205
[12]Tang Wei(唐炜),Lei Ting(雷霆),Li Nianfeng(李年丰).The Chinese Journal of Nonferrous Metals(中国有色金属学报)[J],2011,21(1):12
[13]Brar H S,Wong J,Manuel M V.Journal of the Mechanical Behavior of Biomedical Materials[J],2012(7):87
[14]Zhang Shaoxiang,Zhang Xiaonong,Zhao Changli et al.Acta Biomaterialia[J],2010,6(2):626
[15]Gu X N,Xie X H,Li N et al.Acta Biomaterialia[J],2012,8(6):2360
[16]Dahl S G,Allain P,Marie P J et al.Bone[J],2001,28(4):446
[17]Bornapour M,Muja N,Shum-Tim D et al.Acta Biomaterialia[J],2013,9(2):5319
[18]Suganthi R V,Elayaraja K,Joshy M I A et al.Materials Science and Engineering C[J],2011,31(3):593
[19]Bigi A,Boanini E,Capuccini C et al.Inorganica Chimica Acta[J],2007,360(3):1009
[20]Kokubo T,Takadama H.Biomaterials[J],2006,27(15):2907
[21]Verissimo N C,Brito C,Santos W L R et al.Journal of Alloys and Compounds[J],2016,662:1
[22]Wang Jian,Zhang Yinan,Hudon P et al.Materials&Design[J],2015,86:305
[23]Bornapour M,Celikin M,Cerruti M et al.Materials Science&Engineering C[J],2014,35(2):267
[24]Bakhsheshi-Rad H R,Idris M H,Abdul-Kadir M R et al.Materials&Design[J],2014,53:283
[25]Li Hui,Peng Qiuming,Li Xuejun et al.Materials&Design[J],2014,58:43
[26]Song Yingwei,Shan Dayong,Chen Rongshi et al.Materials Science and Engineering C[J],2009,29(3):1039