Al-5wt.%C(similarly hereinafter)master alloy as a refiner has been developed by powder in situ synthesis process,and the combined effects of Al-5C refiner and EMS(electromagnetic stirring)on grain refinement of AZ31 a...Al-5wt.%C(similarly hereinafter)master alloy as a refiner has been developed by powder in situ synthesis process,and the combined effects of Al-5C refiner and EMS(electromagnetic stirring)on grain refinement of AZ31 alloy are investigated.The results indicate that the A1-5C refiner and EMS can remarkably reduce the grain size of AZ31 alloy. The average grain size of AZ31 alloy decreased firstly and then increased with the increasing addition amount of the Al-5C master alloy,and the optimum addition amounts is 2wt.%.While the AZ31 alloy with 3wt.%Al-5C master alloy solidified under EMS,the average grain size further reduced and is less than that treated only by EMS.The refining mechanism of AZ31 alloy refined by Al-5C master is owing to the polygonal Al_8(Mn,Fe)_5 particles acting as nucleating substrates for α-Mg grain.The more distribution of Al_8(Mn,Fe)_5 and Al4C3 particles generated by EMS contribute to the further refinement when treated by combining with Al-5C refiner.展开更多
The refinement potential of Al-3.5 Fe Nb-1.5 C master alloy on pure aluminium and Al-9.8 Si-3.4 Cu alloy has been investigated. Different amounts of Al-3.5 Fe Nb-1.5 C master alloy were added to estimate the optimal a...The refinement potential of Al-3.5 Fe Nb-1.5 C master alloy on pure aluminium and Al-9.8 Si-3.4 Cu alloy has been investigated. Different amounts of Al-3.5 Fe Nb-1.5 C master alloy were added to estimate the optimal addition level. It was found that the addition of Al-3.5 Fe Nb-1.5 C grain refiner can promote significantly the refinement of grains in the pure aluminium, particularly at 0.1 wt.%, with the mean primary aluminium α-grain size reducing to 187±3 μm from about 1-3 mm. Similarly, the microstructural study of the Al-9.8 Si-3.4 Cu alloy die casting at different weight percentages(viz. 0.0 wt.%, 0.1 wt.% and 1.0 wt.%) of Al-3.5 Fe Nb-1.5 C master alloy shows that the Al-3.5 Fe Nb-1.5 C master alloy as a grain refiner is also acceptable for Al-Si cast alloys when the silicon content is more than 4 wt.%. As a result of inoculation with Al-3.5 Fe Nb-1.5 C master alloy, the average grain size of α-Al is reduced to 22±3 μm from about 71±3 μm and grain refining efficiency is not characterized by any visible poisoning effect, which is the major limitation in the grain refinement of Al-Si cast alloys by applying Al-Ti-B ternary master alloys. Mechanical properties such as ultimate tensile strength and yield strength are significantly improved by 9.6% and 9.7%, respectively.展开更多
基金Project(2011921065)supported by Liaoning BaiQianWan Talents Program,ChinaProject(DUT11ZD115)supported by the Fundamental Research Funds for the Central Universities,China
基金Item Sponsored by the Program of New Century Excellent Talents of the Ministry of Education of China (NCET-08-0080) the Fundamental Research Funds for the Central Universities (DUT11ZD115) the"Liaoning BaiQianWan Talents Program" (2011921065)
文摘Al-5wt.%C(similarly hereinafter)master alloy as a refiner has been developed by powder in situ synthesis process,and the combined effects of Al-5C refiner and EMS(electromagnetic stirring)on grain refinement of AZ31 alloy are investigated.The results indicate that the A1-5C refiner and EMS can remarkably reduce the grain size of AZ31 alloy. The average grain size of AZ31 alloy decreased firstly and then increased with the increasing addition amount of the Al-5C master alloy,and the optimum addition amounts is 2wt.%.While the AZ31 alloy with 3wt.%Al-5C master alloy solidified under EMS,the average grain size further reduced and is less than that treated only by EMS.The refining mechanism of AZ31 alloy refined by Al-5C master is owing to the polygonal Al_8(Mn,Fe)_5 particles acting as nucleating substrates for α-Mg grain.The more distribution of Al_8(Mn,Fe)_5 and Al4C3 particles generated by EMS contribute to the further refinement when treated by combining with Al-5C refiner.
基金financially supported by the National Institute of Technology(NIT),Manipur-India to carry out the industrial experimental research work
文摘The refinement potential of Al-3.5 Fe Nb-1.5 C master alloy on pure aluminium and Al-9.8 Si-3.4 Cu alloy has been investigated. Different amounts of Al-3.5 Fe Nb-1.5 C master alloy were added to estimate the optimal addition level. It was found that the addition of Al-3.5 Fe Nb-1.5 C grain refiner can promote significantly the refinement of grains in the pure aluminium, particularly at 0.1 wt.%, with the mean primary aluminium α-grain size reducing to 187±3 μm from about 1-3 mm. Similarly, the microstructural study of the Al-9.8 Si-3.4 Cu alloy die casting at different weight percentages(viz. 0.0 wt.%, 0.1 wt.% and 1.0 wt.%) of Al-3.5 Fe Nb-1.5 C master alloy shows that the Al-3.5 Fe Nb-1.5 C master alloy as a grain refiner is also acceptable for Al-Si cast alloys when the silicon content is more than 4 wt.%. As a result of inoculation with Al-3.5 Fe Nb-1.5 C master alloy, the average grain size of α-Al is reduced to 22±3 μm from about 71±3 μm and grain refining efficiency is not characterized by any visible poisoning effect, which is the major limitation in the grain refinement of Al-Si cast alloys by applying Al-Ti-B ternary master alloys. Mechanical properties such as ultimate tensile strength and yield strength are significantly improved by 9.6% and 9.7%, respectively.
