过热度对非晶合金玻璃形成能力和力学性能的影响
发布时间：2018-10-05 18:53
【摘要】：采用铜模吸铸法在不同过热度下制备了Cu_(40)Zr_(44)Al_8Ag_8大块非晶合金(BMGs),分别采用同步示差扫描量热仪(DSC)和单轴压缩实验测试了各试样的玻璃形成能力(GFA)和力学性能,并利用X射线衍射(XRD)仪、扫描电子显微镜(SEM)和透射电子显微镜(TEM)等手段对其显微结构与GFA和力学性能的关系进行分析。结果发现:所有试样非晶基体中均夹杂有少量晶体相,且随着过热度的提高,试样的GFA不断提高;非晶合金中晶粒变小,晶化体积分数不断减小,强度和塑性逐渐增大,并在吸铸功率为6 kW时达到最优值,继续增加过热度,力学性能反而迅速下降。
[Abstract]:Cu_ _ (40) Zr_ _ (44) Al_8Ag_8 bulk amorphous alloy (BMGs), was prepared by copper mould suction casting under different superheat. The glass forming ability (GFA) and mechanical properties of each sample were tested by synchronous differential scanning calorimeter (DSC) and uniaxial compression test, respectively. The glass forming ability and mechanical properties of each sample were tested by X-ray diffraction (XRD). The relationship between microstructure, GFA and mechanical properties was analyzed by means of scanning electron microscope (SEM) and transmission electron microscope (TEM). The results show that there is a small amount of crystal phase in the amorphous matrix of all the samples, and the GFA of the sample increases with the increase of superheat, and the grain size becomes smaller, the crystallization volume fraction decreases, the strength and plasticity increase gradually in the amorphous alloy. When the suction power is 6 kW and the superheat is increased, the mechanical properties decrease rapidly.
【作者单位】： 兰州理工大学甘肃省有色金属新材料国家重点实验室;
【基金】：国家自然科学基金(50961008和51061008) 国家重点基础研究发展计划(“973”计划) 前期研究专项资助项目(2011CB612203)
【分类号】：TG139.8
[Abstract]:Cu_ _ (40) Zr_ _ (44) Al_8Ag_8 bulk amorphous alloy (BMGs), was prepared by copper mould suction casting under different superheat. The glass forming ability (GFA) and mechanical properties of each sample were tested by synchronous differential scanning calorimeter (DSC) and uniaxial compression test, respectively. The glass forming ability and mechanical properties of each sample were tested by X-ray diffraction (XRD). The relationship between microstructure, GFA and mechanical properties was analyzed by means of scanning electron microscope (SEM) and transmission electron microscope (TEM). The results show that there is a small amount of crystal phase in the amorphous matrix of all the samples, and the GFA of the sample increases with the increase of superheat, and the grain size becomes smaller, the crystallization volume fraction decreases, the strength and plasticity increase gradually in the amorphous alloy. When the suction power is 6 kW and the superheat is increased, the mechanical properties decrease rapidly.
【作者单位】： 兰州理工大学甘肃省有色金属新材料国家重点实验室;
【基金】：国家自然科学基金(50961008和51061008) 国家重点基础研究发展计划(“973”计划) 前期研究专项资助项目(2011CB612203)
【分类号】：TG139.8
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