摘要
采用差示扫描量热仪以连续加热的方式研究了Zr50Ti5Cu18Ni17Al10块体金属玻璃的热稳定性。其玻璃转变激活能(Eg)以及晶化激活能(Ep1和Ep2)分别为438±11,284±8和323±11kJ/mol。采用压缩试验研究了金属玻璃的室温力学性能,初始应变速率为1×10-4s-1。直径为3mm的金属玻璃棒呈现良好的力学性能,最大塑性应变达3%,杨氏模量和断裂强度的最大值分别为90GPa和1968MPa。多条剪切带的交织、分叉和滑移以及宽度为60?m的较大临界剪切台阶是Zr50Ti5Cu18Ni17Al10块体金属玻璃具有较高压缩塑性的主要原因。
The thermal stability of Zr50Ti5Cu18Ni17Al10 bulk metallic glass was studied by differential scanning calorimeter（DSC） in the mode of continuous heating.The activation energies of glass transition（Eg） and crystallization（Ep1 and Ep2） are 438±11,284±8 and 323±11 kJ/mol,respectively.The study of mechanical properties was conducted in compression at room temperature under an initial strain rate of 1×10-4 s-1.The metallic glass rods with a diameter of 3 mm exhibit a good mechanical property.The plastic strain prior to fracture is up to 3%,and the maximum values of Young＇s modulus and ultimate fracture strength are 90 GPa and 1968 MPa,respectively.The intersecting,branching and sliding of multiple shear bands and the larger critical shear offset with a width of 60 μm are the major reason for the higher compressive plasticity in the Zr50Ti5Cu18Ni17Al10 bulk metallic glass.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2011年第10期1767-1770,共4页
Rare Metal Materials and Engineering
基金
国家自然科学基金(50771064
50831003)
高等学校博士学科点专项科研基金(20060248022)
关键词
块体金属玻璃
热稳定性
力学性能
临界剪切台阶
bulk metallic glass
thermal stability
mechanical properties
critical shear offset
