Papers by Keyword: Particulate Reinforcement

Abstract: The purpose of this study is to investigate the friction stir weld quality of pulverized glass waste (PGW)-reinforced AA6061-T6 and develop a model predicting the hardness of the joint. Friction stir welding of PGW-reinforced AA6061-T6 was done within a process window. The process was optimized for the maximum joint hardness. Thereafter, the result of the hardness was used to develop a model using a novel statistical analytical technique. The addition of PGW enhanced the AA6061-T6 friction stir welded joint hardness. The maximum hardness (112 HV) of the PGW-reinforced joint, which was obtained at optimal setting of 900 rpm rotational speed, 40 mm/min traverse speed and 1^o tilt angle, is by a factor of 1.72 greater than the unreinforced joint and close to the hardness of the as-received AA6061-T6 (120 HV). The developed model can predict the hardness of the PGW-reinforced AA6061-T6 joint up to an accuracy of 89%. The model shows that the rotational speed, tilt angle and their interaction contributed significantly to the hardness of the PGW-reinforced AA6061-T6 friction stir welded joint. This model is suitable for determining the hardness property of particle-reinforced AA6061-T6 friction stir welded joint at varying processing parameters.

Abstract: By applying new warm compaction forming technology of wood power developed through material forming theories in some interdisciplines such as applied science of wood and powder metallurgy, cotton stalk powder (CSP) was used as base material to prepare CSP/Al composite material of which the modulus of rupture and internal bond strength could be up to 83.95MPa and 6.82MPa respectively, wear resistance was 0.05g/100r and water absorption 0.65%. The sliding bearings made of the composite materials had a crushing strength and an apparent hardness up to 91.22MPa and HB51.1 separately. They are expected to replace sintered bronze of powder metallurgy in producing sliding bearings for light textile machinery so as to reduce the usage of nonferrous metal. The application of CSP/Al composite material explores a new way to use wood residuum in agriculture and forestry and ensure its high quality and cleanness.

Abstract: Mg3Zn6Y quasicrystal particulate reinforced Mg-8Gd-3Y alloy was fabricated by adding the Mg3Zn6Y quasicrystal particles into the Mg-8Gd-3Y matrix alloy melt. The effect of volume fraction of quasicrystal particles on the microstructure of quasicrystal particulate reinforced Mg-8Gd-Y alloy was studied using XRD, SEM, TEM and HRTEM. It was found that Mg3Zn6Y quasicrystal particles were melted partly and only 1/3 of them were added into the matrix alloy. The quasicrystal particles distributed in the grain and grain boundary. At the same time, the intermetallic phase composition and the morphology in Mg-8Gd-3Y matrix alloy were changed. The interface between quasicrystal particles and α-Mg was smooth and clear, they combined closely each other and there is no obvious interface chemical reaction when the direction of electron beam was parallel to the 2-fold and 3-fold axes of icosahedral quasicrystal phase particles.