B4C particulate-reinforced 6061A1 composite was fabricated by powder metallurgy method. The as-rolled composite possesses high tensile strength which is comparable to that of the peak-aged 6061A1 alloy. More important...B4C particulate-reinforced 6061A1 composite was fabricated by powder metallurgy method. The as-rolled composite possesses high tensile strength which is comparable to that of the peak-aged 6061A1 alloy. More importantly, the microstructures and mechanical properties are thermally stable during long-term holding at elevated temperature (400℃). The microstructual contributions to the strength of the composite were discussed. Transmission electron microscopy (TEM) analysis indicates that the in-situ formed reinforcement Mg(Al)B2, as products of the interfacial reactions between B4C and the aluminum matrix, show not only good resistance to thermal coarsening but also strong pinning effect to the grain boundaries in the alloy matrix.展开更多
Carbon nanotube(CNT)reinforced aluminum matrix composites(CNT/Al)featuring distinct matrix alloys were crafted utilizing a synergistic approach that integrated high energy ball milling with powder metallurgy technique...Carbon nanotube(CNT)reinforced aluminum matrix composites(CNT/Al)featuring distinct matrix alloys were crafted utilizing a synergistic approach that integrated high energy ball milling with powder metallurgy techniques.The influence of matrix alloy composition on the tribological behavior of CNT/Al composites was investigated.CNT/2009Al composite demonstrates lower friction coefficients and wear rates than CNT/6061Al,while also significantly reducing the wear rate of its counterpart under varying loads by generating an extensive mechanical mixture layer(MML)on its worn surface,while simultaneously hindering the formation of MML on the worn counterface.But for CNT/6061Al,the spalling of substantial material fragments during wear processes led to pronounced delamination wear,particularly under high load.This underscores the superior suitability of high-strength and tough aluminum alloys as matrices for composites,particularly tailored for applications that necessitate components exhibiting wear resistance.展开更多
基金supported by the National Natural Science Foundation of China (grant numbers U1508216, 51501195, 51771194, 51771201)Liaoning Province (20180551101)+1 种基金the Innovation Fund of IMR (2017-PY10)S.J.Z acknowledges ‘Thousand Youth Talents Plan’ of China
文摘B4C particulate-reinforced 6061A1 composite was fabricated by powder metallurgy method. The as-rolled composite possesses high tensile strength which is comparable to that of the peak-aged 6061A1 alloy. More importantly, the microstructures and mechanical properties are thermally stable during long-term holding at elevated temperature (400℃). The microstructual contributions to the strength of the composite were discussed. Transmission electron microscopy (TEM) analysis indicates that the in-situ formed reinforcement Mg(Al)B2, as products of the interfacial reactions between B4C and the aluminum matrix, show not only good resistance to thermal coarsening but also strong pinning effect to the grain boundaries in the alloy matrix.
基金supported by the National Key R&D Program of China(Grant No.2023YFB3710601)the National Natural Science Foundation of China(Grant Nos.52120105001,51931009,52322106,52192595)+2 种基金the Youth Innovation Promotion Association CAS(Grant No.2020197)the IMR Innovation Fund(Grant No.2022-PY03)the Natural Science Foundation of Liaoning Province(Grant No.2022YQ-01)。
文摘Carbon nanotube(CNT)reinforced aluminum matrix composites(CNT/Al)featuring distinct matrix alloys were crafted utilizing a synergistic approach that integrated high energy ball milling with powder metallurgy techniques.The influence of matrix alloy composition on the tribological behavior of CNT/Al composites was investigated.CNT/2009Al composite demonstrates lower friction coefficients and wear rates than CNT/6061Al,while also significantly reducing the wear rate of its counterpart under varying loads by generating an extensive mechanical mixture layer(MML)on its worn surface,while simultaneously hindering the formation of MML on the worn counterface.But for CNT/6061Al,the spalling of substantial material fragments during wear processes led to pronounced delamination wear,particularly under high load.This underscores the superior suitability of high-strength and tough aluminum alloys as matrices for composites,particularly tailored for applications that necessitate components exhibiting wear resistance.
