Bulk metallic glass（BMG） rods Fe71Mo5-xNbxP12C10B2（x=1,2,3,4 and 5） with diameter of 1 or 2 mm were synthesized by copper mold casting.The effects of Nb substitution for Mo on the structure,thermal and mechanical ...Bulk metallic glass（BMG） rods Fe71Mo5-xNbxP12C10B2（x=1,2,3,4 and 5） with diameter of 1 or 2 mm were synthesized by copper mold casting.The effects of Nb substitution for Mo on the structure,thermal and mechanical properties of Fe71Mo5-xNbxP12C10B2 alloys were studied by X-ray diffraction,differential scanning calorimetry and compressive testing.The results show that the substitution of Nb for Mo leads to a decreased glass forming ability,but with plasticity of 1.0%,the fracture strength of Fe71Mo2Nb3P12C10B2 alloy increases up to 4.0 GPa.The improvement of the fracture strength is discussed in terms of the enhancement of atomic bonding nature and the favorite formation of a network-like structure due to the substitution of Nb for Mo.展开更多
Q&P钢的连续退火工艺是一种广泛采用的热处理办法,本文从热力学的角度讨论了连续退火工艺均热过程数种Q&P钢奥氏体化的程度。重新计算了Fe-Si-Mn-C四元系固溶相BCC_A2和FCC_A1的热力学性质。结合连续退火工艺均热段的快速加热,...Q&P钢的连续退火工艺是一种广泛采用的热处理办法,本文从热力学的角度讨论了连续退火工艺均热过程数种Q&P钢奥氏体化的程度。重新计算了Fe-Si-Mn-C四元系固溶相BCC_A2和FCC_A1的热力学性质。结合连续退火工艺均热段的快速加热,短时保温,快速冷却的热处理工艺特点,按照PLE(Partition local equilibrium)和NPLE(Negligible partition local equilibrium)局部平衡计算了当前几种Q&P钢成分的FCC相线和奥氏体体积分数,并根据试验观测结果,提出了一种符合连续退火生产Q&P钢实际需求的准平衡相图计算方法:“准PLE”(Quasi-partition local equilibrium)计算方法,实际观测结果与理论预测结果符合较好。展开更多
以磷铁废渣(Fe1.5P)和温室效应气体CO_2为原料,以磷酸为补充磷源合成磷酸铁锂(LiFePO_4)的前驱体Fe_2P_2O_7,并研究了其合成过程对LiFePO_4正极材料储能性能的影响。采用SEM观察了LiFePO_4的表面形貌,采用XRD分析了LiFePO_4和Fe_2P_2O_...以磷铁废渣(Fe1.5P)和温室效应气体CO_2为原料,以磷酸为补充磷源合成磷酸铁锂(LiFePO_4)的前驱体Fe_2P_2O_7,并研究了其合成过程对LiFePO_4正极材料储能性能的影响。采用SEM观察了LiFePO_4的表面形貌,采用XRD分析了LiFePO_4和Fe_2P_2O_7的晶体结构。进一步对该方法进行优化,发现Fe1.5P与磷酸混合物(nFe1.5P∶nH3PO4=1∶1)在800℃热处理6 h合成的Fe_2P_2O_7对应的LiFePO_4/C电化学性能最好,在0.1C,0.2C,0.5C和1C倍率下的容量分别可达130,126,117和108 m Ah·g^(-1)。展开更多
基金Project (SWU110046) supported by the Doctorate Foundation of Southwest University,China
文摘Bulk metallic glass（BMG） rods Fe71Mo5-xNbxP12C10B2（x=1,2,3,4 and 5） with diameter of 1 or 2 mm were synthesized by copper mold casting.The effects of Nb substitution for Mo on the structure,thermal and mechanical properties of Fe71Mo5-xNbxP12C10B2 alloys were studied by X-ray diffraction,differential scanning calorimetry and compressive testing.The results show that the substitution of Nb for Mo leads to a decreased glass forming ability,but with plasticity of 1.0%,the fracture strength of Fe71Mo2Nb3P12C10B2 alloy increases up to 4.0 GPa.The improvement of the fracture strength is discussed in terms of the enhancement of atomic bonding nature and the favorite formation of a network-like structure due to the substitution of Nb for Mo.
文摘Q&P钢的连续退火工艺是一种广泛采用的热处理办法,本文从热力学的角度讨论了连续退火工艺均热过程数种Q&P钢奥氏体化的程度。重新计算了Fe-Si-Mn-C四元系固溶相BCC_A2和FCC_A1的热力学性质。结合连续退火工艺均热段的快速加热,短时保温,快速冷却的热处理工艺特点,按照PLE(Partition local equilibrium)和NPLE(Negligible partition local equilibrium)局部平衡计算了当前几种Q&P钢成分的FCC相线和奥氏体体积分数,并根据试验观测结果,提出了一种符合连续退火生产Q&P钢实际需求的准平衡相图计算方法:“准PLE”(Quasi-partition local equilibrium)计算方法,实际观测结果与理论预测结果符合较好。
基金financially supported by the National Science Foundation of China (Grant No.21576170)the Opening Project of Material Corrosion and Protection Key Laboratory of Sichuan province (Grant No.2017CL19)~~
文摘以磷铁废渣(Fe1.5P)和温室效应气体CO_2为原料,以磷酸为补充磷源合成磷酸铁锂(LiFePO_4)的前驱体Fe_2P_2O_7,并研究了其合成过程对LiFePO_4正极材料储能性能的影响。采用SEM观察了LiFePO_4的表面形貌,采用XRD分析了LiFePO_4和Fe_2P_2O_7的晶体结构。进一步对该方法进行优化,发现Fe1.5P与磷酸混合物(nFe1.5P∶nH3PO4=1∶1)在800℃热处理6 h合成的Fe_2P_2O_7对应的LiFePO_4/C电化学性能最好,在0.1C,0.2C,0.5C和1C倍率下的容量分别可达130,126,117和108 m Ah·g^(-1)。
