NiAl-La2O3 compostite coating was prepared by Ni-La2O3 electrodeposited and pack aluminized at 1173 K on Ni-base superalloy K38. The result of oxidation in air at 1273 K for 20 h shows that the oxidation rate of NiAl-...NiAl-La2O3 compostite coating was prepared by Ni-La2O3 electrodeposited and pack aluminized at 1173 K on Ni-base superalloy K38. The result of oxidation in air at 1273 K for 20 h shows that the oxidation rate of NiAl-La2O3 coating is remarkably lower than that of NiAl-La2O3 free coating. The oxide film surface morphology of NiAl-La2O3 composite coating was obviously modified after oxidation. HREM study of the fine structure of aluminum oxide on the composite coating shows that La2O3 particles with diameter of 10￣40 nm were incorporated into u-Al2O3 layer. It is believed that La2O3 dispersive particles improve NiAl coating oxidation resistance by a way to influence aluminum layer microstructure and to modify cationic transfer behavior of the layer growth.展开更多
The overall promotion of all-for-one tourism requires tourists' civilized behaviors. This paper focused on tourists' environmental responsible behaviors in the context of all-for-one tourism. On the basis of c...The overall promotion of all-for-one tourism requires tourists' civilized behaviors. This paper focused on tourists' environmental responsible behaviors in the context of all-for-one tourism. On the basis of clarifying the connotation, dimension and driving factors of tourists' environmental responsible behaviors, this paper firstly analyzed the relationship between all-for-one tourism and tourists' environmental responsible behaviors, and proposed that the development of all-for-one tourism was an important path to optimize and upgrade China's tourism industry and a new concept of sustainable development of tourism industry. The emergence of all-for-one tourism has formed a new tourism trend, which will drive tourists to behave more civilly. Tourists' environmental responsible behaviors are a "subject and share" concept, and from tourists' point of view, all-for-one tourism development is the most basic requirement. Secondly, based on the theory of "value-belief-norm", this paper focused on the strengthening mechanism of "interaction effect" between all-for-one tourism and tourists' environmental responsible behaviors, and put forward the idea of "double internalization strengthening" to guide tourists' environmental responsible behaviors from being passive to active, from individuals to groups. Finally, this paper discussed the promotion of environmental responsible behaviors of tourist's specific strategies from two aspects, "external drive" and "internal drive" to enhance the level of all-for-one tourism construction and strengthen the environment responsibility of tourists. "External drives" were as follows:(1) to make a scientific development plan to implement the "host and guest sharing" mechanism;(2) to optimize the landscape, the environment, services, enhance the local attachment of visitors;(3) to improve the infrastructure system, pay attention to the details of visitors' experience;(4) to strengthen environment education and publicity, deepening the quality of tourists' civilization construction, and strengthen the environmental responsible behaviors of tourists. "Internal drives" were as follows:(1) to strengthen the sense of environmental responsibility of tourists;(2) to establish a model of environmental responsible behaviors;(3) to strengthen the supervision of environmental responsible behaviors.展开更多
Ce-TZP/Al2O3 nanocomposites were prepared from mixture of self-made Ce-TZP nanometer powder and commercial A12O3 powder by hot-pressing method. Influences of nanometer ZrO2 particles on the mechanical properties and m...Ce-TZP/Al2O3 nanocomposites were prepared from mixture of self-made Ce-TZP nanometer powder and commercial A12O3 powder by hot-pressing method. Influences of nanometer ZrO2 particles on the mechanical properties and microstructure of Ce-TZP/Al2O3 ceramics were investigated. Meanwhile, t-—m transformation toughening mechanism was investigated by x-ray diffractometry (XRD) method, and deflection of samples under applied stress were recorded too. The results show that when the percentage of ZrO2 was 20%, the mechanical properties and microstructures of materials were preferential. Additionally, TEM observation show that dislocation structures form both in the A12O3 grain and on the A12O3 grain boundary.展开更多
Mechanical properties and microstructures of unidirectionally and tandem rolled alumina dispersion strengthened copper(ADSC)alloys under different conditions were investigated by tensile test,optical microscopy(OM),tr...Mechanical properties and microstructures of unidirectionally and tandem rolled alumina dispersion strengthened copper(ADSC)alloys under different conditions were investigated by tensile test,optical microscopy(OM),transmission electron microscopy(TEM)and scanning electron microscopy(SEM).For unidirectionally rolled ADSC alloys,their strengths and elongations in the longitudinal direction are higher than those in the transverse direction under both cold rolling and annealing conditions.Once fracture appears in their longitudinal stress—strain curves,sudden reduction of overall stress level before complete fracture can be observed in the transverse tensile curves.The anisotropy of mechanical properties for the ADSC alloy can be greatly improved by tandem cold rolling.And no sudden reduction of overall stress level appears in the stress—strain curves for tandem rolled ADSC alloys.The differences of their microstructures and tensile fractures were analyzed.In order to compare the differences of tensile fracture mechanism in different directions,longitudinal and transverse fracture models for unidirectionally rolled ADSC alloys were also introduced.展开更多
文摘NiAl-La2O3 compostite coating was prepared by Ni-La2O3 electrodeposited and pack aluminized at 1173 K on Ni-base superalloy K38. The result of oxidation in air at 1273 K for 20 h shows that the oxidation rate of NiAl-La2O3 coating is remarkably lower than that of NiAl-La2O3 free coating. The oxide film surface morphology of NiAl-La2O3 composite coating was obviously modified after oxidation. HREM study of the fine structure of aluminum oxide on the composite coating shows that La2O3 particles with diameter of 10￣40 nm were incorporated into u-Al2O3 layer. It is believed that La2O3 dispersive particles improve NiAl coating oxidation resistance by a way to influence aluminum layer microstructure and to modify cationic transfer behavior of the layer growth.
基金Sponsored by Zhejiang Provincial Philosophy and Social Science Planning Project(17NDJC218YB)Project of Hangzhou Col ege of Commerce,Zhejiang Gongshang University(2016YJ-06)+1 种基金National Natural Science Foundation of China(41661034)Public Welfare Project of International Scientific and Technology Cooperation Project of Science Technology Department of Zhejiang Province(2016C34003)
文摘The overall promotion of all-for-one tourism requires tourists' civilized behaviors. This paper focused on tourists' environmental responsible behaviors in the context of all-for-one tourism. On the basis of clarifying the connotation, dimension and driving factors of tourists' environmental responsible behaviors, this paper firstly analyzed the relationship between all-for-one tourism and tourists' environmental responsible behaviors, and proposed that the development of all-for-one tourism was an important path to optimize and upgrade China's tourism industry and a new concept of sustainable development of tourism industry. The emergence of all-for-one tourism has formed a new tourism trend, which will drive tourists to behave more civilly. Tourists' environmental responsible behaviors are a "subject and share" concept, and from tourists' point of view, all-for-one tourism development is the most basic requirement. Secondly, based on the theory of "value-belief-norm", this paper focused on the strengthening mechanism of "interaction effect" between all-for-one tourism and tourists' environmental responsible behaviors, and put forward the idea of "double internalization strengthening" to guide tourists' environmental responsible behaviors from being passive to active, from individuals to groups. Finally, this paper discussed the promotion of environmental responsible behaviors of tourist's specific strategies from two aspects, "external drive" and "internal drive" to enhance the level of all-for-one tourism construction and strengthen the environment responsibility of tourists. "External drives" were as follows:(1) to make a scientific development plan to implement the "host and guest sharing" mechanism;(2) to optimize the landscape, the environment, services, enhance the local attachment of visitors;(3) to improve the infrastructure system, pay attention to the details of visitors' experience;(4) to strengthen environment education and publicity, deepening the quality of tourists' civilization construction, and strengthen the environmental responsible behaviors of tourists. "Internal drives" were as follows:(1) to strengthen the sense of environmental responsibility of tourists;(2) to establish a model of environmental responsible behaviors;(3) to strengthen the supervision of environmental responsible behaviors.
基金supports from Educational Fund of Jiangxi province(DB200201009)the Fund of Materials Science and Engineering Center of Jiangxi Province(KG200201020),China are highly appreciated.
文摘Ce-TZP/Al2O3 nanocomposites were prepared from mixture of self-made Ce-TZP nanometer powder and commercial A12O3 powder by hot-pressing method. Influences of nanometer ZrO2 particles on the mechanical properties and microstructure of Ce-TZP/Al2O3 ceramics were investigated. Meanwhile, t-—m transformation toughening mechanism was investigated by x-ray diffractometry (XRD) method, and deflection of samples under applied stress were recorded too. The results show that when the percentage of ZrO2 was 20%, the mechanical properties and microstructures of materials were preferential. Additionally, TEM observation show that dislocation structures form both in the A12O3 grain and on the A12O3 grain boundary.
基金Projects(2002AA302505,2006AA03Z517)supported by the National High-Tech Research and Development Program of China
文摘Mechanical properties and microstructures of unidirectionally and tandem rolled alumina dispersion strengthened copper(ADSC)alloys under different conditions were investigated by tensile test,optical microscopy(OM),transmission electron microscopy(TEM)and scanning electron microscopy(SEM).For unidirectionally rolled ADSC alloys,their strengths and elongations in the longitudinal direction are higher than those in the transverse direction under both cold rolling and annealing conditions.Once fracture appears in their longitudinal stress—strain curves,sudden reduction of overall stress level before complete fracture can be observed in the transverse tensile curves.The anisotropy of mechanical properties for the ADSC alloy can be greatly improved by tandem cold rolling.And no sudden reduction of overall stress level appears in the stress—strain curves for tandem rolled ADSC alloys.The differences of their microstructures and tensile fractures were analyzed.In order to compare the differences of tensile fracture mechanism in different directions,longitudinal and transverse fracture models for unidirectionally rolled ADSC alloys were also introduced.
基金the financial support from the Fundamental Research Program of Shanxi Province,China(No.202203021211130)the National Natural Science Foundation of China(Nos.51801132,52075359)。
