骨科進行肌腱及韌帶縫合手術時，縫合用線的末端會使用鉚釘來固定在骨骼上，因此骨科手術經常用到縫合鉚釘；縫合鉚釘必須能夠承受生物運動在縫合處的應力而不損壞，且不會危害人體，這使得醫界對於縫合鉚釘的材料改善相當有興趣。我們希望材料具有良好的機械性質，本實驗室製作出的鎂基金屬玻璃合金強度高，且楊氏係數與人體的骨骼相近，因此適合用於縫合鉚釘的材料開發。本研究選擇以具有較佳玻璃形成能力的Mg66Zn29Ca5為基底分別添加微米級鐵顆粒及鈦鋯金屬玻璃顆粒以製作鎂基金屬玻璃合金複材，期望提升其破裂韌性。由於冷卻速率的限制，本研究所製作之4 mm直徑棒材均呈現部分非晶態，但其抗壓強度仍遠高於一般的鎂合金。由實驗結果顯示，添加鐵顆粒之鎂基金屬玻璃合金複材的破裂韌性並無明顯的改善，但添加球狀鈦鋯金屬玻璃顆粒之鎂基金屬玻璃合金複材的破裂韌性則有明顯的，隨著鈦鋯金屬玻璃顆粒的添加量增加至30 vol.%，破裂韌性也由1.17提升至4.19 MPa‧m1/2，且能保持535 MPa的最大抗壓強度。;Suture anchors are often used to rivet the suture wires at the bones in orthopedic surgery. Therefore, suture anchor must be able to withstand the stress of biological movements and non-harmful to human body. This attracts the medical community to pay lots attention on the improvement of materials for suture anchor. We want that the material has the good mechanical properties of the material. The Mg-based bulk metallic glasses (BMG) produced by our laboratory has high strength and Young′s modulus is similar to the value of human bones. Therefore, it is very suitable to apply the Mg-based metallic glass alloys on suture anchor. In this study, Mg66Zn29Ca5, has the best glass forming ability in the Mg-Zn-Ca metallic glass alloy system, was selected to be the base alloy. Then this base alloy was added with different vol% micro-sized spherical Fe and TiZr-based metallic glass particles to form Mg-based bulk metallic glass composite (BMGC), respectively for improving its fracture toughness. Due to the limitation of cooling rate, the BMGC rods with 4 mm in diameter only present partial metallic glass state, but still show much higher compressive strength of commercial magnesium alloy. Based on the results of this study, the Mg-based BMGCs added Fe particle could not obtain effective improvement on fracture toughness. On the other hand, the Mg-based BMGCs added with TiZr-based metallic glass particles present a clear improvement of fracture toughness. With increasing the addition of Ti-Zr metallic glass particles to 30 vol.%, the fracture toughness of Mg-based BMGC increases from 1.17 to 4.19 MPa‧m1/2 and remains the maximum compressive strength of 535 MPa.
