Long-term thermal stability of a series of Zr-based metallic glasses with different oxygen contents below their glass transition temperatures was compared based on their deductive continuous-heating-transformation dia...Long-term thermal stability of a series of Zr-based metallic glasses with different oxygen contents below their glass transition temperatures was compared based on their deductive continuous-heating-transformation diagrams created by using the corollary of Kissinger analysis method. It is found that the influence of oxygen on the long-term thermal stability of Zr-based metallic glasses exhibits at lower temperature is different from that on their short-term thermal stability presented at higher temperature. For each kind of the Zr-based metallic glasses, there is a critical heating rate, φ , which corresponds to a critical c temperature, Tc. As heating rate is smaller than φ c and onset devitrification temperature is below Tc, the glass with higher oxygen content will have longer incubation period for onset devitrification. The values of φ c and Tc are related with the glasses’ reduced glass transition temperature Trg. The improving effect of oxygen impurity on the long-term thermal stability of Zr-based metallic glasses was discovered.展开更多
采用差示扫描量热仪分别对未添加稀土和添加稀土的30Mn钢进行连续加热实验,利用Kissinger和JMA方程计算了材料的相变激活能和动力学因子。结果表明,添加0.2%(质量分数)的稀土硅铁合金使30Mn钢奥氏体化的起始温度A_(c1)和结束温度A_(c3)...采用差示扫描量热仪分别对未添加稀土和添加稀土的30Mn钢进行连续加热实验,利用Kissinger和JMA方程计算了材料的相变激活能和动力学因子。结果表明,添加0.2%(质量分数)的稀土硅铁合金使30Mn钢奥氏体化的起始温度A_(c1)和结束温度A_(c3)提高,相变激活能增加了186 k J/mol,相变动力学因子n值减小。未添加稀土和添加稀土的30Mn钢的奥氏体化过程均可分为2个阶段,并且不同阶段具有不同的晶粒长大机制。展开更多
基金Project(50671076) supported by the National Natural Science Foundation of China
文摘Long-term thermal stability of a series of Zr-based metallic glasses with different oxygen contents below their glass transition temperatures was compared based on their deductive continuous-heating-transformation diagrams created by using the corollary of Kissinger analysis method. It is found that the influence of oxygen on the long-term thermal stability of Zr-based metallic glasses exhibits at lower temperature is different from that on their short-term thermal stability presented at higher temperature. For each kind of the Zr-based metallic glasses, there is a critical heating rate, φ , which corresponds to a critical c temperature, Tc. As heating rate is smaller than φ c and onset devitrification temperature is below Tc, the glass with higher oxygen content will have longer incubation period for onset devitrification. The values of φ c and Tc are related with the glasses’ reduced glass transition temperature Trg. The improving effect of oxygen impurity on the long-term thermal stability of Zr-based metallic glasses was discovered.
文摘采用差示扫描量热仪分别对未添加稀土和添加稀土的30Mn钢进行连续加热实验,利用Kissinger和JMA方程计算了材料的相变激活能和动力学因子。结果表明,添加0.2%(质量分数)的稀土硅铁合金使30Mn钢奥氏体化的起始温度A_(c1)和结束温度A_(c3)提高,相变激活能增加了186 k J/mol,相变动力学因子n值减小。未添加稀土和添加稀土的30Mn钢的奥氏体化过程均可分为2个阶段,并且不同阶段具有不同的晶粒长大机制。
