B4C reinforced Al composites are widely used as neutron absorbing materials(NAMs)due to excellent neutron absorbing efficiency,however,such NAMs exhibit poor high-temperature properties.To meet the requirement for str...B4C reinforced Al composites are widely used as neutron absorbing materials(NAMs)due to excellent neutron absorbing efficiency,however,such NAMs exhibit poor high-temperature properties.To meet the requirement for structure-function integration,NAMs with enhanced high-temperature mechanical properties are desired.In this work,a novel(B4 C+Al_(2)O_(3))/Al NAM with netlike distribution of Al_(2)O_(3)was fabricated by powder metallurgy method and subjected to high-temperature tensile creep test.It was shown that the creep resistance was enhanced by several orders of magnitude via the addition of only2.1 vol.%netlike-distributed Al_(2)O_(3).(B_(4)C+Al_(2)O_(3))/Al exhibited high apparent stress exponents ranging from 16 to 25 and high apparent activation energy of 364 kJ/mol.The creep behaviour could be rationalized using the substructure-invariant model and its rupture behaviour could be described by the Dobes-Milicka equation.展开更多
An overview of tropical cyclone(TC)observational field campaigns across the globe is provided,with an emphasis on field campaigns in the Western North Pacific basin.A history of airborne experiments is first presented...An overview of tropical cyclone(TC)observational field campaigns across the globe is provided,with an emphasis on field campaigns in the Western North Pacific basin.A history of airborne experiments is first presented for both the Atlantic and Western North Pacific basins.Some noteworthy research results arising from field campaigns in the Western North Pacific basin in the past 10-15 years are then discussed.The current airborne capabilities for monitoring typhoons are discussed.Finally,a case for an international typhoon field campaign in the Western North Pacific is presented.Challenges and opportunities for such an international field campaign are described as a part of this discussion.展开更多
基金financially supported by the National Natural Science Foundation of China(No.51771194)the CNNC Science Fund for Talented Young Scholars,the LingChuang Research Project of China National Nuclear Corporation,the LiaoNing Revitalization Talents Program(No.XLYC1902058)the IMR Innovation Fund(Nos.2021-ZD02 and 2021-PY12)。
文摘B4C reinforced Al composites are widely used as neutron absorbing materials(NAMs)due to excellent neutron absorbing efficiency,however,such NAMs exhibit poor high-temperature properties.To meet the requirement for structure-function integration,NAMs with enhanced high-temperature mechanical properties are desired.In this work,a novel(B4 C+Al_(2)O_(3))/Al NAM with netlike distribution of Al_(2)O_(3)was fabricated by powder metallurgy method and subjected to high-temperature tensile creep test.It was shown that the creep resistance was enhanced by several orders of magnitude via the addition of only2.1 vol.%netlike-distributed Al_(2)O_(3).(B_(4)C+Al_(2)O_(3))/Al exhibited high apparent stress exponents ranging from 16 to 25 and high apparent activation energy of 364 kJ/mol.The creep behaviour could be rationalized using the substructure-invariant model and its rupture behaviour could be described by the Dobes-Milicka equation.
基金support of NSFC with No.U214226 and“Typhoon Scientific and Technological Inno-vation Group of CMA” 2023ZD06.
文摘An overview of tropical cyclone(TC)observational field campaigns across the globe is provided,with an emphasis on field campaigns in the Western North Pacific basin.A history of airborne experiments is first presented for both the Atlantic and Western North Pacific basins.Some noteworthy research results arising from field campaigns in the Western North Pacific basin in the past 10-15 years are then discussed.The current airborne capabilities for monitoring typhoons are discussed.Finally,a case for an international typhoon field campaign in the Western North Pacific is presented.Challenges and opportunities for such an international field campaign are described as a part of this discussion.
