Recently,the 2025 Central Conference on Work Related to Neighboring Countries was held in Beijing.As an important theoretical innovation,the conference emphasized for the first time pursuing“the model of security for...Recently,the 2025 Central Conference on Work Related to Neighboring Countries was held in Beijing.As an important theoretical innovation,the conference emphasized for the first time pursuing“the model of security for Asia that features sharing weal and woe,seeking common ground while shelving differences,and prioritizing dialogue and consultation.”1 This fully demonstrates that China prioritizes neighborhood on its diplomatic agenda,regards security and stability in its neighborhood as a core strategic support,and is ready to collaborate with neighboring countries for a future of shared peace,development,and prosperity.展开更多
Element W can effectively improve the density of energetic structural materials. However, W is an inert element and does not combust in air. To change the reaction characteristics of W, 60 at.% Al was introduced into ...Element W can effectively improve the density of energetic structural materials. However, W is an inert element and does not combust in air. To change the reaction characteristics of W, 60 at.% Al was introduced into W through mechanical alloying. XRD analysis shows that after 50 h of ball milling, the diffraction peak of Al completely disappears and W(Al60) super-saturated solid solution powder is obtained. Further observation by HAADF and HRTEM reveals that the W(Al60) super-saturated solid solution powder is a mixture of solid solution and amorphous phase. Based on the good thermal stability of W(Al60) alloy powder below 1000℃, W(Al60)-Al composite was synthesized by hot pressing process.Impact initiation experiments suggest that the W(Al60)-Al composite has excellent reaction characteristics, and multiple types of tungsten oxides are detected in the reaction products, showing that the modified W is combustible in air. Due to the combustion of tungsten, the energy release rate of the W(Al60)-Al composite at speed of 1362 m/s reaches 2.71 kJ/g.展开更多
文摘Recently,the 2025 Central Conference on Work Related to Neighboring Countries was held in Beijing.As an important theoretical innovation,the conference emphasized for the first time pursuing“the model of security for Asia that features sharing weal and woe,seeking common ground while shelving differences,and prioritizing dialogue and consultation.”1 This fully demonstrates that China prioritizes neighborhood on its diplomatic agenda,regards security and stability in its neighborhood as a core strategic support,and is ready to collaborate with neighboring countries for a future of shared peace,development,and prosperity.
基金supported by the National Natural Science Foundation of China, [Award number: 11972372] and [Award number: U20A20231]。
文摘Element W can effectively improve the density of energetic structural materials. However, W is an inert element and does not combust in air. To change the reaction characteristics of W, 60 at.% Al was introduced into W through mechanical alloying. XRD analysis shows that after 50 h of ball milling, the diffraction peak of Al completely disappears and W(Al60) super-saturated solid solution powder is obtained. Further observation by HAADF and HRTEM reveals that the W(Al60) super-saturated solid solution powder is a mixture of solid solution and amorphous phase. Based on the good thermal stability of W(Al60) alloy powder below 1000℃, W(Al60)-Al composite was synthesized by hot pressing process.Impact initiation experiments suggest that the W(Al60)-Al composite has excellent reaction characteristics, and multiple types of tungsten oxides are detected in the reaction products, showing that the modified W is combustible in air. Due to the combustion of tungsten, the energy release rate of the W(Al60)-Al composite at speed of 1362 m/s reaches 2.71 kJ/g.
