添加Nd对Mg-Zn-Ca合金非晶形成能力和耐蚀性的影响
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摘要
采用真空铜模喷铸法制备了直径为2 mm的Mg68-xZn28Ca4Ndx(x=0,0.5,1,1.5)合金,研究了Nd添加量对合金的非晶形成能力以及耐腐蚀性能的影响。利用SEM、EDS能谱分析了模拟体液中浸泡不同时间后非晶合金的显微组织与成分,利用XRD和DSC分析了合金的相组成和非晶形成能力,利用电化学工作站对合金在模拟体液中的电化学性能进行了测试。结果表明,随着Nd添加量的增加,合金的非晶形成能力下降,当Nd元素的添加量为1.0%和1.5%时,α-Mg相在非晶基体上析出,试样由纯非晶结构转变为晶体和非晶的复合结构。Mg67.5Zn28Ca4Nd0.5非晶试样展现了最好的抗腐蚀性能。
Mg68-xZn28 Ca4 Ndx( x =0,0.5,1,1.5) amorphous alloys with diameter of 2 mm were prepared by copper die spray-casting in vacuum. and research emphasis was put on the impact of Nd addition on the glass formation ability and corrosion resistance of the alloy. Specifically,the microstructure and composition of the amorphous alloy after immersion in the simulated body fluid for various duration were observed and analyzed by scanning electron microscopy( SEM) and energy spectrum analysis( EDS). The phase composition and glass formation ability of the alloy were investigated by X-ray diffraction( XRD) and differential scanning calorimeter( DSC). Furthermore,electrochemical workstations was employed to test the electrochemical performance of the amorphous alloys in simulated body fluids. The research results have demonstrated that the glass formation ability of the alloy declined with the growing addition amount of Nd. Particularly,α-Mg phase precipitated on the amorphous matrix,when the addition amount of Nd were 1.0% and 1.5%. Accordingly,the alloy samples varied from pure amorphous structure to mix structure of crystalline and amorphous. Consequently,the Mg67.5 Zn28 Ca4 Nd0.5 amorphous sample exhibits the best corrosion resistance.
Mg68-xZn28 Ca4 Ndx( x =0,0.5,1,1.5) amorphous alloys with diameter of 2 mm were prepared by copper die spray-casting in vacuum. and research emphasis was put on the impact of Nd addition on the glass formation ability and corrosion resistance of the alloy. Specifically,the microstructure and composition of the amorphous alloy after immersion in the simulated body fluid for various duration were observed and analyzed by scanning electron microscopy( SEM) and energy spectrum analysis( EDS). The phase composition and glass formation ability of the alloy were investigated by X-ray diffraction( XRD) and differential scanning calorimeter( DSC). Furthermore,electrochemical workstations was employed to test the electrochemical performance of the amorphous alloys in simulated body fluids. The research results have demonstrated that the glass formation ability of the alloy declined with the growing addition amount of Nd. Particularly,α-Mg phase precipitated on the amorphous matrix,when the addition amount of Nd were 1.0% and 1.5%. Accordingly,the alloy samples varied from pure amorphous structure to mix structure of crystalline and amorphous. Consequently,the Mg67.5 Zn28 Ca4 Nd0.5 amorphous sample exhibits the best corrosion resistance.
引文
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