Effects of Ti and Be addition on microstructure and mechanical properties of Mg_(58.5)Cu_(30.5)Y_(11) bulk metallic glass  

Ti和Be对Mg_(58.5)Cu_(30.5)Y_(11)大块金属玻璃显微组织和力学性能的影响（英文）

作　　者：邱克强[1] 王琳[1] 任英磊[1] 李荣德[1] 

机构地区：[1]沈阳工业大学材料科学与工程学院,沈阳110870

出　　处：《Transactions of Nonferrous Metals Society of China》2015年第2期477-482,共6页中国有色金属学报（英文版）

基　　金：Project(2011CB606301)supported by the National Basic Research Program of China

摘　　要：Based on the Mg58.5Cu30.5Y11 alloy, 10% Ti, 10% Be and 10% Ti70Be30 （mole fraction） were respectively added to the alloy and samples with a diameter of 3 mm were fabricated by conventional Cu-mold casting method. The phase constituent, thermal stability and microstructure of the alloys were investigated by using X-ray diffraction, differential scanning calorimetry and scanning electron microscopy, respectively. The effects of alloying elements Ti and Be on the microstructure and mechanical properties of Mg58.sCu3o.sYll alloy were discussed. The results show that CuTi phase is distributed in （Mg0.585Cu0.305Y0.11）90Ti10 and （Mg58.5Cu30.5Y11）90（Ti0.7Be0.3）10 alloys, while CuYBe glassy phase containing CuY crystals is embedded in the matrix of （Mg58.5Cu30.5Y11）90Be10 alloy. Under uniaxial compressive loading, the largest compressive fracture strengths for （Mg58.5Cu30.5Y11）90Ti10, （Mg58.5Cu30.5Y11）90Be10 and （Mg58.5Cu30.5Y11）90（Ti0.7Be0.3）10 alloys are 797.6, 952.6 and 1007.8 MPa, respectively, and the strengths are increased by about 17%, 40% and 48% compared with Mg58.5Cu30.5Y11 alloy. The strength reliability for the three alloys is much improved according to the strength distribution region of 10 samples of each alloy.以Mg58.5Cu30.5Y11合金为基础分别加入含量为10%(摩尔分数)的Ti、Be和Ti70Be30,通过传统铜模铸造法制备直径为3 mm的试样。分别采用X射线衍射仪、差示扫描量热计和扫描电子显微镜研究合金的相组成、热稳定性和显微组织。讨论合金元素Ti和Be对Mg58.5Cu30.5Y11块体金属玻璃的显微组织和力学性能的影响。结果表明,(Mg0.585Cu0.305Y0.11)90Ti10和(Mg0.585Cu0.305Y0.11)90(Ti0.7Be0.3)10合金中分布着CuTi相,而(Mg0.585Cu0.305Y0.11)90-Be10合金基体中镶嵌着含有CuY晶体的CuYBe非晶相。在单轴压缩载荷下,(Mg0.585Cu0.305Y0.11)90Ti10、(Mg0.585Cu0.305Y0.11)90Be10和(Mg0.585Cu0.305Y0.11)90(Ti0.7Be0.3)10合金的最大压缩断裂强度分别为797.6、952.6和1007.8 MPa,比Mg58.5Cu30.5Y11合金的强度分别提高了17%、40%和48%。根据每种合金10个试样的强度分布范围推断这3种合金的强度可靠性得到了很大提高。

关 键 词：Mg-based alloy alloying element TI BE MICROSTRUCTURE strength reliability 

分 类 号：TG139.8[一般工业技术—材料科学与工程]