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首页> 外文期刊>Materials Science and Engineering >Stress corrosion cracking of biodegradable Mg-4Zn alloy in simulated body fluid at different strain rates - A fractographic investigation
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Stress corrosion cracking of biodegradable Mg-4Zn alloy in simulated body fluid at different strain rates - A fractographic investigation

机译：不同应变速率下模拟液中可生物降解的Mg-4Zn合金的应力腐蚀开裂-形貌研究

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摘要

Degradable magnesium based implants are predisposed to failure by stress corrosion cracking (SCC) when subject to tensile loads in the human body. Slow strain rate (SSR) tests are used in SCC analysis and the applied strain rate is a critical factor to determine if the material failed by stress corrosion or mechanical overload. In this paper, the SCC susceptibility of Mg-4Zn alloy in simulated body fluid (SBF) is investigated at different strain rates. It was found that elongation to failure (epsilon) and ultimate tensile strength (UTS) decreased by 80% and 58% respectively when extension rate in SBF decreased from 3.6 x 10(-4) s(-1) to 3.6 x 10(-6) s(-1). When the Mg-4Zn alloy is strained in SBF, multiple surface cracks appear on the gauge, initiated at the corrosion pits that induce mechanical overload and failure at higher strain rates. As the strain rate decreases, the increased contact time between the surface and SBF results in hydrogen embrittlement, micro crack formation and progressive transgranular failure that is evident in the fractography. The reduction in UTS and elongation even at the highest strain rate tested indicate that the critical strain rate for stress corrosion cracking of Mg-4Zn alloy in simulated body fluid could be as high as 3.6 x 10(-4) s(-1).
机译：当在人体中承受拉伸载荷时，可降解的镁基植入物容易因应力腐蚀开裂（SCC）而失效。 SCC分析中使用了慢应变速率（SSR）测试，所施加的应变速率是确定材料是否因应力腐蚀或机械过载而失效的关键因素。本文研究了不同应变速率下Mg-4Zn合金在模拟体液（SBF）中的SCC敏感性。发现当SBF的延伸率从3.6 x 10（-4）s（-1）降低到3.6 x 10（-）时，断裂伸长率（epsilon）和极限拉伸强度（UTS）分别降低80％和58％。 6）s（-1）。当Mg-4Zn合金在SBF中变形时，应变仪上会出现多个表面裂纹，这些裂纹始于腐蚀坑，在较高的应变速率下会引起机械过载和破坏。随着应变速率的降低，表面与SBF之间的接触时间增加，导致氢脆，微裂纹形成和渐进的跨晶破坏，这在分形学中很明显。即使在测试的最高应变速率下，UTS的降低和伸长率的降低表明，模拟体液中Mg-4Zn合金应力腐蚀开裂的临界应变速率可能高达3.6 x 10（-4）s（-1）。

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