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Mn‐promoting formation of a long‐period stacking‐ordered phase in laser‐melted Mg alloys to enhance degradation resistance
Materials and Corrosion ( IF 1.6 ) Pub Date : 2019-11-14 , DOI: 10.1002/maco.201911257 Cijun Shuai 1, 2, 3 , Long Liu 1 , Chengde Gao 1 , Wenjing Yang 1 , Zhenyu Zhao 3 , Ying Tan 4 , Weiwei Liao 5
Materials and Corrosion ( IF 1.6 ) Pub Date : 2019-11-14 , DOI: 10.1002/maco.201911257 Cijun Shuai 1, 2, 3 , Long Liu 1 , Chengde Gao 1 , Wenjing Yang 1 , Zhenyu Zhao 3 , Ying Tan 4 , Weiwei Liao 5
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Magnesium (Mg) alloys are promising candidates for use as biomedical implant materials. However, their very fast degradation rate greatly restricts their application. A rare earth phase possessed with a long‐period stacking‐ordered (LPSO) structure was in favor of enhancing the degradation resistance of Mg alloys. In fact, the formation of the LPSO phase in Mg alloys depends on their stacking fault energy. The lower the stacking fault energy, the more the LPSO phase formed. In this study, manganese (Mn) was alloyed to Mg alloy ZK30–10Gd (containing 3 wt.% Zn and 10 wt.% Gd) via selective laser melting to promote the formation of the LPSO phase. As an alloying element, Mn could be in favor of reducing stacking fault energy due to the fact that the large difference between the atomic radius of Mn and that of Mg induced large lattice distortion to facilitate forming stacking faults. The results showed that as the Mn content increased from 0 to 1.2 wt.%, the area fraction of LPSO phase increased from 12.22% to 22.37%, meanwhile the area fraction of (Mg,Zn)3Gd phase decreased from 9.31% to 2.32%. The ZK30–10Gd–0.6Mn possessed the highest degradation resistance (weight loss rate 0.38 mg · cm−2 · day−1). The enhancement of degradation resistance had two reasons. On the one hand, more LPSO phase provided more sites for nucleation of degradation products, which could promote the formation of a homogeneous and compact degradation product film to protect the Mg matrix. On the other hand, the inhibition of (Mg,Zn)3Gd phase precipitation could reduce galvanic corrosion.
中文翻译：
锰促进激光熔解镁合金中长周期堆积有序相的形成，以增强抗降解性
镁（Mg）合金有望用作生物医学植入材料。但是，它们非常快的降解速度极大地限制了它们的应用。具有长周期堆积有序（LPSO）结构的稀土相有利于增强Mg合金的抗降解性。实际上，镁合金中LPSO相的形成取决于其堆垛层错能。堆垛层错能越低，形成的LPSO相就越多。在这项研究中，锰（Mn）通过选择性激光熔化与ZK30-10Gd镁合金（含有3 wt。％的锌和10 wt。％的Gd）形成合金，以促进LPSO相的形成。作为合金元素，由于Mn和Mg的原子半径之间的大差异引起大的晶格畸变，从而有助于形成堆叠缺陷，因此Mn可能有利于减少堆垛层错能量。结果表明，随着Mn含量从0增加到1.2 wt。％，LPSO相的面积分数从12.22％增加到22.37％，而（Mg，Zn）的面积分数3 Gd相从9.31％降低至2.32％。ZK30-10Gd-0.6Mn具有最高的抗降解性（失重率0.38 mg·cm -2 ·天-1）。抗降解性的提高有两个原因。一方面，更多的LPSO相提供了更多的降解产物成核位点，这可以促进形成均质且致密的降解产物膜，从而保护Mg基体。另一方面，抑制（Mg，Zn）3 Gd相沉淀可以减少电腐蚀。
更新日期：2019-11-14
中文翻译：
锰促进激光熔解镁合金中长周期堆积有序相的形成，以增强抗降解性
镁（Mg）合金有望用作生物医学植入材料。但是，它们非常快的降解速度极大地限制了它们的应用。具有长周期堆积有序（LPSO）结构的稀土相有利于增强Mg合金的抗降解性。实际上，镁合金中LPSO相的形成取决于其堆垛层错能。堆垛层错能越低，形成的LPSO相就越多。在这项研究中，锰（Mn）通过选择性激光熔化与ZK30-10Gd镁合金（含有3 wt。％的锌和10 wt。％的Gd）形成合金，以促进LPSO相的形成。作为合金元素，由于Mn和Mg的原子半径之间的大差异引起大的晶格畸变，从而有助于形成堆叠缺陷，因此Mn可能有利于减少堆垛层错能量。结果表明，随着Mn含量从0增加到1.2 wt。％，LPSO相的面积分数从12.22％增加到22.37％，而（Mg，Zn）的面积分数3 Gd相从9.31％降低至2.32％。ZK30-10Gd-0.6Mn具有最高的抗降解性（失重率0.38 mg·cm -2 ·天-1）。抗降解性的提高有两个原因。一方面，更多的LPSO相提供了更多的降解产物成核位点，这可以促进形成均质且致密的降解产物膜，从而保护Mg基体。另一方面，抑制（Mg，Zn）3 Gd相沉淀可以减少电腐蚀。
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