Electrolytic Low-titanium Aluminum Is The Deformation Of 6063 Alloy

Titanium element has significant effect on microstructures and properties of aluminum alloys. Generally, the master alloy containing Ti is applied to grain refinement of aluminum alloy in industry. Adding titanium to aluminum alloys by electrolysis is a simple and efficient method. The mechanical properties of the as-cast alloy made from Electrolytic low-titanium aluminum alloy can be improved The study of deformation aluminum alloys made from low-titanium aluminum alloy has not been reported. 6063 alloys is a kind of typical deformation Al-Mg-Si alloys. In this paper, the effects and mechanism of grain refinements of electrolytic low-titanium aluminum alloy were further studied. 6063 alloys were made from electrolytic low-titanium aluminum alloys, and the grain refinements, microstructures, heat treatment technique and mechanical properties of the alloys were investigated. The main researched results are presented as the followings:Effects and mechanism of the grain refinement of electrolytic low-titanium aluminum alloys are systematically studied, and a model of the grain refinement of electrolytic low-titanium aluminum alloys is put forward. When the content of Ti in Al alloys is over 0.04%, the coarse columnar grain in pure Al is refined to equi-axed grain, and the grain size was decreased with the enhancement of titanium content. When the titanium content is over 0.204%, the best refinement effect was reached. There are secondary particles Al₃Ti and TiC in electrolytic low-titanium aluminum alloy, which are lump and site in the center of a(Al) grain. Al₃Ti and TiC can act as heterogeneous nuclei of a(Al) during solidification. The solute titanium has a great growth-restricting effect. The grain refinement of electrolytic low-titanium aluminum alloys is both synthetic effects of the secondary particles and the solute titanium.From the aspect of solidification, the mathematic relation between grain size and influencing factors is deduced. After comparing with experiments, the relation between grain size and influencing factors is fitted with the tested data under 0.16%F29C -0 2481Ti: r(C) = -1069.97In +121.73. The correlation is proper.K ' [ 29C jIn this paper, the grain refinement effects and fading of the 6063 alloy adding Ti by electrolysis> by Al-5Ti-lB and by Al-5Ti master alloys were investigated, and the grain refinement effects of electrolytic low-titanium aluminum with Boron, which was added to the alloys through A1-1B master alloy, were also studied. The experimental results show that the grain refinement effects of the 6063 alloy adding Ti by different methods were all very obvious. Without Boron in the alloy, the grain refinement effect of titanium added by electrolysis is better than that of Al-5Ti master alloy when titanium content is the same. With Boron in the alloy, when adding A1-1B master alloy into electrolytic low-titanium aluminum alloys, the grain refinement effect is much better than that of Al-5Ti-lB master alloy with the same titanium content.The microstructures of 6063 alloys made from electrolytic low-titanium aluminum alloy are studied for the first time. The optimum solution treatment technique is 525°Cx7min. If solution treatment is finished at low temperature for a short time, alloy element can't solute enough. Solution treatment at high temperature for a long time, will lead to the trend of overheating and grain will become coarse, which is harmful to mechanical properties. Titanium element has significant effect on the precipitation process. Ti can alters the size, and distribution of the precipitation 8" . With the increase of Ti content, the size of metastable W become bigger, but it's number density get smaller when aging at 200 °C for 2 hour0The aging hardness of the 6063 alloy adding Ti by electrolysis has been studied for the first time. With the increase of aging temperature, the hardening rate of the alloy increases, and the hardness peak is low. With the increase of aging time, precipitation in grains becomes coarser, and PFZs become wider. With the increase of Ti content, the hardening rate of the alloy decreases at first stage, and the time to maximum hardness becomes shorter. This is because titanium is in preference to combining with cavity created in quenching, and restricts the formation of GP..Compounds containing Ti can act as heterogeneous nuclei of B" , and promote the formation of B" .The mechanical properties of the alloy were studied systematically. Strong wind quenching during production at 200°C aging for 2 hour, with increase of Ti content, the strength of the alloy is increased at first stage, and then decreased later, elongation is remarkably improved . When the Ti content is from 0.015% to 0.16%, the elongation and the strength of the studied alloy are increased by 130% and 10% respectively. After pre-ageing at low temperature, the mechanical properties are further improved. The strength and the elongation of the studied alloy with 0.035%Ti were increased by 18.5% and 24.5% respectively after pre-ageing. At 150°C pre-aging for 2 hour, and then 175°C aging for 8 hour, the optimum heat treatment technique was reached.The mechanical properties of 6063 alloys adding Ti by Electrolysis is better than that adding Ti by Al-5Ti master alloy. The more the amount of Mg2Si in alloys is, the better the strength of the alloy is; If composition and heat treatment technique are not correct, it is harmful to mechanical properties. The grain refinement effects and mechanism of electrolytic low-titanium aluminum alloys are better than that of adding Ti by Al-5Ti master alloy. The enhancement of the strength of 6063 alloys made from electrolytic low-titanium aluminum alloy is about 9%, and at the same time elongation ratio was not decreased. It is sure that making 6063 alloys with electrolytic low-titanium aluminum alloy without master alloy refiners is absolutely feasible.