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The effect of Equal Channel Angular Pressing on the stress corrosion cracking susceptibility of AZ31 alloy in simulated body fluid.
Journal of the Mechanical Behavior of Biomedical Materials ( IF 3.9 ) Pub Date : 2020-03-23 , DOI: 10.1016/j.jmbbm.2020.103724
Mirco Peron 1 , Pål Christian Skaret 2 , Alberto Fabrizi 3 , Alessandra Varone 4 , Roberto Montanari 4 , Hans Jørgen Roven 2 , Paolo Ferro 3 , Filippo Berto 1 , Jan Torgersen 1
Affiliation  

Despite the great potential of Mg and its alloys as material for biodegradable implants, their low resistance to the simultaneous action of corrosion and mechanical stresses in the human body have hampered their use. Stress Corrosion Cracking has been reported as one of the most critical failure modes to overcome to allow such materials to be clinically applied. Thus, in this paper we investigate the effect of Equal Channel Angular Pressing (ECAP) on the Stress Corrosion Cracking (SCC) susceptibility of the AZ31 Mg alloy. To do so, AZ31 alloy has been subjected to 1, 2 and 4 passes of ECAP, and the samples so obtained have then been tested by means Slow Strain Rate Tests (SSRTs) in Simulated Body Fluid (SBF) at 37 °C. Samples subjected to one pass of ECAP are shown to be less susceptible to SCC compared to the material in the as-received condition, while further ECAP processing (2 and 4 passes) are found to worsen the SCC susceptibility. To understand the different SCC susceptibilities shown by the differently ECAPed samples, microstructural analyses, potentiodynamic polarization curves, hydrogen evolution experiments and Scanning Electron Microscopy (SEM) analyses of the fracture surfaces were carried out. The improved corrosion resistance of the samples subjected to 1 pass of ECAP compared to the samples in the as received condition (due to a finer grain size) and to the samples subjected to 2 and 4 passes (due to a more favourable texture evolution) represents the reason of their reduced SCC susceptibility.



中文翻译:

等通道转角挤压对模拟体液中AZ31合金应力腐蚀开裂敏感性的影响。

尽管镁及其合金作为可生物降解植入物的材料具有巨大潜力,但它们对人体同时发生腐蚀和机械应力的抵抗力较低,因此阻碍了它们的使用。据报道,应力腐蚀开裂是要克服的最关键的失效模式之一,以使此类材料可以在临床上应用。因此,在本文中,我们研究了等通道角挤压(ECAP)对AZ31镁合金的应力腐蚀开裂(SCC)敏感性的影响。为此,对AZ31合金进行了1、2和4次ECAP检验,然后通过慢应变速率测试(SSRT)在模拟体液(SBF)中于37°C对如此获得的样品进行了测试。与经过测试的材料相比,经过ECAP一次通过的样品显示出对SCC的敏感性较低,同时发现进一步的ECAP处理(2和4遍)会恶化SCC敏感性。为了理解由不同的ECAPed样品所表现出的不同的SCC磁化率,对断口表面进行了显微结构分析,电位动力学极化曲线,氢析出实验和扫描电子显微镜(SEM)分析。与处于接收状态的样品相比(由于晶粒更细)和经过2和4遍的样品(由于更有利的织构发展),经过ECAP 1次通过的样品的耐腐蚀性提高它们降低SCC敏感性的原因。进行了显微组织分析,电位动力学极化曲线,氢析出实验和扫描电子显微镜(SEM)对断裂表面的分析。与处于接收状态的样品相比(由于晶粒更细)和经过2和4遍的样品(由于更有利的织构发展),经过ECAP 1次通过的样品的耐腐蚀性提高它们降低SCC敏感性的原因。进行了显微组织分析,电位动力学极化曲线,氢析出实验和扫描电子显微镜(SEM)对断裂表面的分析。与处于接收状态的样品相比(由于晶粒更细)和经过2和4遍的样品(由于更有利的织构发展),经过ECAP 1次通过的样品的耐腐蚀性提高它们降低SCC敏感性的原因。

更新日期:2020-03-23
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