摘要

本研究使用MgZnY合金 (Mg97Zn1Y2) 添加0.2 wt% 羥基磷灰石製成鎂基複合材料，並經過500℃持溫10小時均質化熱處理，探討材料的微觀組織、機械性質與體外降解行為之變化。
研究解果顯示MgZnY合金組成為α-Mg及Mg12YZn相(LPSO相)。MgZnY合金在添加羥基磷灰石後硬度有些微提升，但在拉伸機械性質部分強度皆不如MgZnY合金；然而，添加羥基磷灰石後之MgZnY合金呈現較佳的耐腐蝕性質，改善了原本MgZnY合金點蝕情形，呈現出均勻腐蝕面貌，且在長時間腐蝕速率由2.93 mm/year下降至1.11 mm/year。
在經過500℃持溫10小時均質化熱處理後，拉伸機械性質相較於鑄後有明顯提升的情形，MgZnY合金抗拉強度由170 MPa提升至175 MPa，伸長量由9%提升至15%。但熱處理過後由於LPSO相的擴展造成伽尼凡腐蝕加劇，使耐腐蝕性質呈現下降趨勢。

Abstract

In this study, a Mg-based metal matrix composite was produced by casting a mixture of Mg97Zn1Y2 and 0.2 wt% of hydroxyapatite, followed by homogenization at 500℃ for 10 hours. The microstructure, mechanical properties and in vitro degradation of the material were investigated.
The results show that MgZnY alloy consisting of α-Mg and Mg12YZn phase. After adding the hydroxyapatite, Vickers microhardness is slightly increased but the tensile mechanical properties are decreased; however, better corrosion resistance properties are observed after the addition of the hydroxyapatite. The corrosion mode changes from the original localized pitting corrosion mode to a more desirable uniform corrosion. The long-time corrosion rate decreases from 2.93 mm/year to 1.11 mm/year.
The tensile mechanical properties of materials after homogenization are better than those after casting. The ultimate tensile strength increases from 170 MPa to 175 MPa and elongation increases from 9% to 15%. However, due to the expansion of the LPSO phase into theα-Mg region, the Galvanic corrosion becomes more severe. As a result, the corrosion properties show a downward trend.

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