Mg-3Ni-2MnO2 nanocomposite is fabricated by mechanical-milling under hydrogen atmosphere with the pressure of 0.5MPa, and heat and mass transfer of reaction bed was measured through the self-made apparatus. The result...Mg-3Ni-2MnO2 nanocomposite is fabricated by mechanical-milling under hydrogen atmosphere with the pressure of 0.5MPa, and heat and mass transfer of reaction bed was measured through the self-made apparatus. The results show that compared with the intrinsic absorption of Mg-3Ni-2MnO2 hydrogen storage material, the accumulated absorption kinetics of the reaction bed behaves so differently. At 150-300℃ during absorption process, the higher the temperature is, the better the intrinsic kinetics behaves. But during the same temperature range, the lower the initial temperature of the reaction bed is, the better the accumulated absorption kinetics is. During the absorption process, the temperature of reaction bed wall is lower than that of center, and the initial temperature has no influence on the highest temperature in the center of the reaction bed . When the reaction is finished, the reaction bed temperature turns to be homogeneous gradually.展开更多
The effect of 0.5wt.%Zn addition on the microstructure and mechanical properties of Mg-3Y-2Nd-0.5Zr(WE32)alloy was investigated.The results indicate that WE32-0.5Zn alloy takes 48 h to reach peak hardness after solid ...The effect of 0.5wt.%Zn addition on the microstructure and mechanical properties of Mg-3Y-2Nd-0.5Zr(WE32)alloy was investigated.The results indicate that WE32-0.5Zn alloy takes 48 h to reach peak hardness after solid solution treatment at 525℃and aging at 200℃,10 h earlier than WE32 alloy,which implies an accelerated aging precipitation kinetics owing to the addition of 0.5wt.%Zn.A large quantity of finerod and rectangular block-like Zn-Zr precipitates in theα-Mg matrix are formed in the WE32-0.5Zn alloy,and numerous needle-likeβ1phases are distributed at both ends of the Zn-Zr precipitates at peak-aged condition.In peak-aged condition,the ultimate tensile strength considerably increases from 263.2 MPa(WE32)to 309.6 MPa(WE32-0.5Zn),and the elongation dramatically increases from 4.3%(WE32)to 8.9%(WE32-0.5Zn).Theβ’andβ1phases are the main precipitates of the WE32-0.5Zn alloy peak-aged at 200℃.Theβ’andβ1phases easily nucleate at the Zn-Zr precipitates,and theβ1phases are particularly likely to nucleate and grow at the interface between the two ends of the Zn-Zr precipitates,which accelerates aging precipitation kinetics and leads to a shorter time to achieve peak aging.展开更多
文摘Mg-3Ni-2MnO2 nanocomposite is fabricated by mechanical-milling under hydrogen atmosphere with the pressure of 0.5MPa, and heat and mass transfer of reaction bed was measured through the self-made apparatus. The results show that compared with the intrinsic absorption of Mg-3Ni-2MnO2 hydrogen storage material, the accumulated absorption kinetics of the reaction bed behaves so differently. At 150-300℃ during absorption process, the higher the temperature is, the better the intrinsic kinetics behaves. But during the same temperature range, the lower the initial temperature of the reaction bed is, the better the accumulated absorption kinetics is. During the absorption process, the temperature of reaction bed wall is lower than that of center, and the initial temperature has no influence on the highest temperature in the center of the reaction bed . When the reaction is finished, the reaction bed temperature turns to be homogeneous gradually.
基金financially supported by the Natural Science Foundation of Inner Mongolia under Grant No.2022MS05045the Science and Technology Planning of Inner Mongolia under Grant No.2020GG0175the Project of State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization under Grant No.2021Z2351。
文摘The effect of 0.5wt.%Zn addition on the microstructure and mechanical properties of Mg-3Y-2Nd-0.5Zr(WE32)alloy was investigated.The results indicate that WE32-0.5Zn alloy takes 48 h to reach peak hardness after solid solution treatment at 525℃and aging at 200℃,10 h earlier than WE32 alloy,which implies an accelerated aging precipitation kinetics owing to the addition of 0.5wt.%Zn.A large quantity of finerod and rectangular block-like Zn-Zr precipitates in theα-Mg matrix are formed in the WE32-0.5Zn alloy,and numerous needle-likeβ1phases are distributed at both ends of the Zn-Zr precipitates at peak-aged condition.In peak-aged condition,the ultimate tensile strength considerably increases from 263.2 MPa(WE32)to 309.6 MPa(WE32-0.5Zn),and the elongation dramatically increases from 4.3%(WE32)to 8.9%(WE32-0.5Zn).Theβ’andβ1phases are the main precipitates of the WE32-0.5Zn alloy peak-aged at 200℃.Theβ’andβ1phases easily nucleate at the Zn-Zr precipitates,and theβ1phases are particularly likely to nucleate and grow at the interface between the two ends of the Zn-Zr precipitates,which accelerates aging precipitation kinetics and leads to a shorter time to achieve peak aging.
