添加Ti顆粒對MgZnCa非晶質合金之機械性質研究;Mechanical Properties of Magnesium Based Bulk Metallic Glass Composites with the Ti particles

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Title:	添加Ti顆粒對MgZnCa非晶質合金之機械性質研究;Mechanical Properties of Magnesium Based Bulk Metallic Glass Composites with the Ti particles
Authors:	翁培鈞;Wong,Pei-chun
Contributors:	機械工程研究所
Keywords:	生物降解;生物相容性;裂紋;非晶質合金;bulk metallic glass composites (BMGCs);biocompatibility;biodegradable;crack
Date:	2012-07-23
Issue Date:	2012-09-11 18:17:34 (UTC+8)
Publisher:	國立中央大學
Abstract:	由於醫學的進步，人類開始改善醫療環境及方法，甚至減少手術次數，減輕因醫療手術所產生的痛楚，因此能夠在體內被分解的可生物降解性材料受到了極大的關注。鎂鋅鈣塊狀非晶質合金材料具有較好的機械性質、生物相容性以及均勻的生物降解能力，適合用於骨釘、骨板等骨科植入物，但在室溫下的壓縮變形使得材料呈現粉碎性的破壞，為非常脆性的材料，進一步的應用較為困難。本實驗以Mg60Zn35Ca5為基材，添加球型延性Ti金屬顆粒製成非晶質合金複合材料，添加不同比例Ti顆粒進行壓縮試驗，結果顯示添加Ti金屬顆粒後破壞強度由655MPa提升至1187MPa，且可達到最高5.4%的塑性變形量。鎂基非晶質合金之彈性係數與所添加的Ti顆粒不同，因此能夠吸收裂紋(crack)的能量，阻止其快速傳遞與增生，但因Ti金屬顆粒與MgZnCa非晶質合金基材的附著力不佳，僅能吸收較弱的裂紋能量，但能使較強裂紋的傳遞距離拉長，減緩材料被破壞的時間。Due to technology advancements, the medical treatment is being improved. One of being concerned is the attempt to simplify the procedure of implantation surgery, which possibly relieves the pain during the recovering process. The biodegradable material provides an attractive solution which is decomposable in human body with widely attention for decades. MgZnCa bulk metallic glass alloy, which has good mechanical properties, biocompatibility and uniform biodegradability, is suitable for the application in orthopedic implants, for example, the bone screws and bone plates. Unfortunately, such material is quite brittle where further application is limited. In this study, we have successfully synthesized the Ti particles reinforced Mg60Zn35Ca5 bulk metallic glass composites (BMGCs) rod with diameter of 2 mm by injection casting method in an argon atmosphere. The glass forming ability (GFA) and the mechanical properties of these Mg-based BMGCs have been systematically investigated as a function of the volume fraction (Vf) of Ti particles. The results showed that the compressive ductility increased with Vf of Ti particles. The mechanical performance with up to 5.4% compressive failure strain and 1187 MPa fracture strength at room temperature can be obtained for the Mg-based BMGCs with 50 vol.% Ti particles, which suggests that these dispersed Ti particles can absorb the energy of crack and branches the primary crack into multiple secondary crack. Therefore, further propagation of crack is blocked and then enhances the plasticity.
Appears in Collections:	[Graduate Institute of Mechanical Engineering] Electronic Thesis & Dissertation

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