摘要
分别采用单辊甩带法和铜模铸造法制备了Al基Al-(Ni,Co)-(Er,Gd)合金的带状和楔形样品。利用X射线衍射法和金相法检测了合金的组织、结构;利用差示扫描量热仪、差示热分析仪以及热机械分析仪对合金的热性能进行评价。结果表明,添加适量Co和Gd元素能增大Al-Ni-Er非晶合金过冷液体的热稳定性和玻璃形成能力,其中Al85Ni5Co2Er6Gd2合金的过冷液相区间、非晶态形成的临界厚度以及过冷液相区最低黏度系数分别达到35K、340μm和0.13GPa·s。通过研究非晶合金的晶化行为发现,添加Co和Gd元素可使Al-Ni-Er非晶合金的初始晶化相由α-Al单相变为α-Al+Al3Er 2相,并且增大了合金的晶化表观激活能,以此定性地说明了其提高合金过冷液体热稳定性的原因。
The ribbons and wedge-shaped samples of Al-based AI-（Ni, Co）-（Er, Gd） alloys were prepared by melt-spinning and copper mold-casting methods, respectively. The structure of the alloys was examined by X-ray diffraction （XRD） and optical metallography. The thermal properties were investigated by differential scanning calorimetry （DSC）, differential thermal analysis （DTA） and thermomechanical analysis （TMA）. The results indicate that proper addition of Co and Gd elements can enhance the stabilization of supercooled liquids and glass-forming ability of the A1-Ni-Er metallic glasses, where the supercooled liquid region, critical size for glass formation, and the minimum viscosity in the supercooled liquid state for Alas Ni5 Co2 Er6 Gda metallic glass can respectively reach 35 K, 340μm, and 0.13 GPa·s. Study on the crystallization behavior of the metallic glasses reveals that the precipitation phases change from a single a-Al to mixed a-Al＋Al3 Er after Co and Gd addition, and the crystallization activation energy increases, which can qualitatively explain the mechanism of enhancing the thermal stability of the supercooled liquid.
出处
《中国科技论文》
CAS
北大核心
2016年第16期1886-1891,共6页
China Sciencepaper
基金
高等学校博士学科点专项科研基金资助项目(20130041110006)
关键词
非晶合金
AL基合金
热稳定性
玻璃形成能力
晶化行为
amorphous alloys
Al-based alloys
thermal stability
glass-forming ability
crystallization behavior
