The Influence of Iron-particles Addition on Thermal and Mechanical Properties of Mg-based Amorphous Alloy

• Main Authors: Che-Wei Wu, 吳哲瑋
• Other Authors: Shian-Ching Jang
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/d4gz6b

碩士 === 國立中央大學 === 材料科學與工程研究所 === 102 === The biodegradable materials can be dissolved spontaneously in human body, hence the secondary surgery is not required and many infections can be avoided. Therefore, biodegradable materials have attracted great attention in the field of medical research. Magnesium, Zinc and Calcium are elements with high content in human body. The Mg-Zn-Ca amorphous alloy has become a potential candidate of orthopedic implants due to its high bio-compatibility and low Young’s Modulus that is quite close to human bones. However, it still has many restrictions on applications because of its inherit brittleness. The glass forming ability (GFA) of MgxZn95-xCa5 (x = 65-67) alloying system was evaluated in the beginning of this study, and the result reveals that the Mg66Zn29Ca5 has the highest value of GFA in this alloy system. Therefore, the composition of Mg66Zn29Ca5 was utilized as the matrix to fabricate Mg-based BMGC with equiaxial iron particles addition. The result of compression test also shows the dispersion strengthening effect of the iron particles on increasing the fracture strength of the Mg-based BMG. The fracture strength of Mg66Zn29Ca5-based BMGC can be increased from 394 MPa to 650 MPa. However, no obvious improvement of plasticity can be obtained for this Mg-based BMGC due to the bad adhesion between the iron particles and the amorphous matrix.