In this paper the tensile properties of both ordered and disordered Ni-24Fe and Ni-24Fe-0.03%B （wt%） alloys in gaseous hydrogen was investigated. The result shows that the ductility of the disordered Ni3Fe is signif...In this paper the tensile properties of both ordered and disordered Ni-24Fe and Ni-24Fe-0.03%B （wt%） alloys in gaseous hydrogen was investigated. The result shows that the ductility of the disordered Ni3Fe is significantly larger than that of ordered material in gaseous hydrogen. However, the ductility of ordered Ni3Fe doped with 0.03%B is nearly the same as that of disordered one indicating the obvious suppressing effect of boron on the H2-induced embrittlement. Based on the segregation behavior of boron in Ni3A1, it is proposed that the suppressing effect of boron in Ni3Fe on the H2-induced embrittlement is attributed to the segregation of boron on grain boundaries, thereby reducing the hydrogen diffusivity along the grain boundaries.展开更多
针对核电厂循环水冲洗泵盖板表面结构完整性破坏失效的工程问题,基于冷金属过渡技术(Cold metal transfer,CMT),开展了CuAl9Ni3Fe2铝青铜合金电弧增材修复工艺的研究。通过单层单道成形、单层多道搭接成形以及多层多道试验研究,确定并...针对核电厂循环水冲洗泵盖板表面结构完整性破坏失效的工程问题,基于冷金属过渡技术(Cold metal transfer,CMT),开展了CuAl9Ni3Fe2铝青铜合金电弧增材修复工艺的研究。通过单层单道成形、单层多道搭接成形以及多层多道试验研究,确定并固化了一套CuAl9Ni3Fe2铝青铜合金CMT增材修复工艺的关键参数;并借鉴已有成熟的核电设备制造工程实践,参考RCC-M规范要求,制定了该修复工艺的验证试验要求,明确了试验项目、试验标准及验收指标,并按要求完成试件的制备及试验。结果表明:采用研发的CMT增材修复工艺制备的熔敷金属外观成形优良,内部致密无缺陷且与母材熔合良好,力学性能与母材相当,各项试验结果均满足验收指标。可用于CuAl9Ni3Fe2铝青铜合金的CMT增材制造及修复。展开更多
Noble metal-loaded layered hydroxides exhibit high efficiency in electrocatalyzing water splitting.However,their widespread use as bifunctional electrocatalysts is hindered by low metal loading,inefficient yield,and c...Noble metal-loaded layered hydroxides exhibit high efficiency in electrocatalyzing water splitting.However,their widespread use as bifunctional electrocatalysts is hindered by low metal loading,inefficient yield,and complex synthesis processes.In this work,platinum atoms were anchored onto nickel-iron layered double hydroxide/carbon nanotube(LDH/CNT)hybrid electrocatalysts by using a straightforward milling technique with K_(2)Pt Cl_(6)·6H_(2)O as the Pt source.By adjusting the Pt-to-Fe ratio to 1/2 and 1/10,excellent electrocatalysts—Pt_(1/6)-Ni_(2/3)Fe_(1/3)-LDH/CNT and Pt_(1/30)-Ni_(2/3)Fe_(1/3)-LDH/CNT—were achieved with superior performance in hydrogen evolution reaction(HER)and oxygen evolution reaction(OER),outperforming the corresponding commercial Pt/C(20 wt%)and Ru O_(2)electrocatalysts.The enhanced electrochemical performance is attributed to the modification of Pt's electronic structure,which exhibits electron-rich states for HER and electrondeficient states for OER,significantly boosting Pt's electrochemical activity.Furthermore,the simple milling technology for controlling Pt loading offers a promising approach for scaling up the production of electrocatalysts.展开更多
基金Project supported by the National Natural Science Foundation of China （Grant Nos. 50371050, 50671057）
文摘In this paper the tensile properties of both ordered and disordered Ni-24Fe and Ni-24Fe-0.03%B （wt%） alloys in gaseous hydrogen was investigated. The result shows that the ductility of the disordered Ni3Fe is significantly larger than that of ordered material in gaseous hydrogen. However, the ductility of ordered Ni3Fe doped with 0.03%B is nearly the same as that of disordered one indicating the obvious suppressing effect of boron on the H2-induced embrittlement. Based on the segregation behavior of boron in Ni3A1, it is proposed that the suppressing effect of boron in Ni3Fe on the H2-induced embrittlement is attributed to the segregation of boron on grain boundaries, thereby reducing the hydrogen diffusivity along the grain boundaries.
文摘针对核电厂循环水冲洗泵盖板表面结构完整性破坏失效的工程问题,基于冷金属过渡技术(Cold metal transfer,CMT),开展了CuAl9Ni3Fe2铝青铜合金电弧增材修复工艺的研究。通过单层单道成形、单层多道搭接成形以及多层多道试验研究,确定并固化了一套CuAl9Ni3Fe2铝青铜合金CMT增材修复工艺的关键参数;并借鉴已有成熟的核电设备制造工程实践,参考RCC-M规范要求,制定了该修复工艺的验证试验要求,明确了试验项目、试验标准及验收指标,并按要求完成试件的制备及试验。结果表明:采用研发的CMT增材修复工艺制备的熔敷金属外观成形优良,内部致密无缺陷且与母材熔合良好,力学性能与母材相当,各项试验结果均满足验收指标。可用于CuAl9Ni3Fe2铝青铜合金的CMT增材制造及修复。
基金supported by the Natural Science Foundation of Henan(242300421230)the Young Teacher Fundamental Research Cultivation Program of Zhengzhou University(JC23557030)the National Natural Science Foundation of China(U21A20281 and 22208322)。
文摘Noble metal-loaded layered hydroxides exhibit high efficiency in electrocatalyzing water splitting.However,their widespread use as bifunctional electrocatalysts is hindered by low metal loading,inefficient yield,and complex synthesis processes.In this work,platinum atoms were anchored onto nickel-iron layered double hydroxide/carbon nanotube(LDH/CNT)hybrid electrocatalysts by using a straightforward milling technique with K_(2)Pt Cl_(6)·6H_(2)O as the Pt source.By adjusting the Pt-to-Fe ratio to 1/2 and 1/10,excellent electrocatalysts—Pt_(1/6)-Ni_(2/3)Fe_(1/3)-LDH/CNT and Pt_(1/30)-Ni_(2/3)Fe_(1/3)-LDH/CNT—were achieved with superior performance in hydrogen evolution reaction(HER)and oxygen evolution reaction(OER),outperforming the corresponding commercial Pt/C(20 wt%)and Ru O_(2)electrocatalysts.The enhanced electrochemical performance is attributed to the modification of Pt's electronic structure,which exhibits electron-rich states for HER and electrondeficient states for OER,significantly boosting Pt's electrochemical activity.Furthermore,the simple milling technology for controlling Pt loading offers a promising approach for scaling up the production of electrocatalysts.
