The Al-Ti-C alloy is the most widely used grain refiner for Al-7Si alloys. However, TiC particles in alloys tend to aggregate and settle, thereby reducing their refinement efficiency. In present paper, a novel Al-3Ti-4.35La master was developed, its influence on stability of investigated by XRD, SEM, TEM. results show that when Al-TiC added alloy, will accumulate settle obviously after holding certain time (15 min, 30 60 min). When are aggregation settlement weakened under same time....

Three types of Al–5Ti master alloys were synthesized by a method thermal explosion reaction in pure molten aluminum. Performance comparison alloy grain refinement commercial purity Al with different additions (0.6%, 1.0%, 1.6%, 2.0%, and 3.0%) holding time (10, 30, 60 120 min) investigated. The results show that blocky TiAl3 particles clearly has better refining efficiency than the mixed needle-like particles. structures alloys, differing sizes, morphologies quantities crystals, found to...

Al–5Ti–C master alloy was prepared and used to modify hypereutectic Al–20%Si alloy. The microstructure evolution mechanical properties of with additions (0, 0.4, 0.6, 1.0, 1.6 2.0 wt%) were investigated. results show that, (0.6 wt%, 10 min) can significantly refine both eutectic primary Si morphology the crystals refined from a coarse polygonal star-like shape fine polyhedral grain size roughly 90–120 μm 20–50 μm. phases modified platelet-like/needle-like structure fibrous discrete...

The effects of CeO₂ on the microstructure and synthesis mechanism Al-Ti-C alloy were investigated by quenching experiment method, while using Al powder, Ti graphite powder as main raw materials. results showed that addition was favorable for promoting formation TiC particles in systems. With contents increasing, distribution more homogeneous, rare earth phase Ti₂Al20Ce formed. had little effect Al₃Ti systems, but a significant particles. In system, is mainly formed reaction dissolved [Ti]...

The effect of Er addition on the fluidity and microstructure transformation as-cast T5 heat-treated ZL205A alloys was investigated by optical microscope (OM), scanning electron microscopy (SEM), X-ray diffraction (XRD) energy dispersive spectrometer (EDS). liquid metal after adding tested fracture characteristics material were analyzed. results indicated that mainly dissolved into an α-Al matrix near grain boundaries (GBs). It is easily segregated enriched in intersection GBs or interface...

Al-Ti-C master alloys have been widely investigated by various researchers. However, their refining effectiveness is still severely compromised the preparation process. In this work, aluminum melt in-situ reaction was carried out to synthesize Al-5Ti-0.62C, and its performance estimated. The thermodynamics calculation differential scanning calorimeter experiment were used investigate synthesis mechanism of TiC. Quenching conducted explore phase microstructure transformation Al-5Ti-0.62C...

The hot deformation behaviors of the new 6063 aluminum alloy modified by rare earth Y and Al-Ti-B master were studied through isothermal compression experiments on Gleeble-3800 thermal simulator. By characterizing flow curves, constitutive models, processing maps, microstructures, we can see from true stress-true strain curves that stress decreases with increase temperature decrease rate. Through calculation equation, derived activation energy composite is 224.570 KJ/mol. roughly obtained...

Abstract Al-5Ti-0.6C-1Ce master alloy has been successfully prepared by a method of thermal explosion reaction in pure molten aluminum. The microstructure the was characterized means optical microscopy, X-ray diffraction and scanning electron microscopy equipped with energy-dispersive spectrometry. results showed that composed α-Al, granular TiC, lump-like TiAl 3 block-like Ti 2 Al 20 Ce. When compared Al-5Ti-0.6C alloy, formation Ce compounds addition accelerated TiC. An excellent...

Al-5Ti-0.62C-0.2Ce master alloy was synthesized by a method of thermal explosion reaction in pure molten aluminum and used to modify commercial Al hypoeutectic Al-8Si alloy. The microstructure tensile properties with different additions were investigated. results show that the composed α-Al, granular TiC, lump-like TiAl3 block-like Ti2Al20Ce. (0.3 wt %, 5 min) can significantly refine macro grains into tiny equiaxed grains. 30 still has good refinement effect. strength elongation modified...

Abstract The physical characters that belong to hypo-eutectic Al-Si alloys are affected by certain important factors including the dimension, distribution together with structure of eutectic Si crystals primary α -Al. In this paper, A356-x Al-5Ti-0.62C-1.07La (x = 0, 4, 5, 6, 7 wt%) was prepared mechanical stirring. effects intermediate alloy on microstructures and properties A356 investigated. Results show -Al significantly refined alloy. secondary dendrite arm space (SDAS) unrefined is...

Al–5Ti–C alloy was prepared and the microstructure evolution during remelting process its grain refinement performance toward pure aluminium were investigated. The results show that with a more uniform successfully prepared, it composed of Al, TiAl3 TiC. At temperature 730°C, increase in heat preservation time remelted melt, originally dispersed TiC aggregated pushed boundaries by α-Al, while dissoluted, grew. 1000°C, time, not only aggregated, but also size morphology changed significantly...

The effects of CeO2 size on the microstructure and synthesis mechanism Al-Ti-C alloy were investigated using a quenching experiment method. A scanning calorimetry was used to investigate TiC, aluminum melt in situ reaction carried out synthesize master alloys its refining performance estimated. results show that Al-Ti-C-Ce system is mainly composed α-Al, Al3Ti, TiC Ti2Al20Ce. addition obviously speeds up progress reaction, reduces Al3Ti lowers formation temperature second-phase particles....

Abstract The microstructure of 6063 aluminum alloy has an important influence on its properties. In this paper, the effect composite addition Nd (0, 0.1 wt%, 0.2 0.4 0.6 wt%) and Al–Ti–B master mechanical properties was studied. results show that modification rare earth great refinement alloy. With amount is grain boundary mainly a short rod or discontinuous granular AlFeSiMgNd complex compound. content reaches enrichment occurs at boundaries, grid-like AlSiNd phase formed. After 180 days...

Abstract In this paper, 6063 aluminum alloy for common building profiles is used as the research object. The effect of on microstructure and properties studied by adding a new type Al-Ti-C-La master alloy. results show that has an obvious influence grain refinement With addition alloy, size decreased significantly. When additional amount 1%, reduced from 482 μ m to 121 m. Rare earth La mainly distributed near Mg 2 Si phase β -AlFeSi, complex compounds such AlFeSiMgLa are formed. After aging...

Many alloys and aluminum composites have been produced in recent years for improved material performance. Al 6061 is now an alloy with a wide range of uses owing to its excellent microstructure. For the manufacture matrix (AMC), it wise option matrix. The in-situ process produces composites, according this research. It investigates mechanical properties modern fabrication, processing conditions, multiple reinforcements employed. Numerous researches shown that latest commonly used ideal...

The effects of holding time and Si on the content, shape size structure Ti2Al20La phase in Al-Ti-La intermediate alloy were investigated by an X-ray diffractometer, scanning electron microscope transmission microscope. results show that volume fraction aspect ratio decrease significantly, from 21% 2.3 without addition to 4% 2.0 with wt.% at a 15 min 750 °C, respectively. element will attach form La-Si binary grain boundary α-Al. With increase 60 min, content gradually decreases...

It is a practically significant issue to refine and modify industrial Al-Si casting alloy improve its properties. In the present study, novel refiner Al-3Ti-4.35La alloy, prepared by melt-reaction method, was used, combined with Sr as-cast A356 alloy. Their effects on microstructures mechanical properties of were investigated. The results indicate that addition intermediate can microstructure enhance After adding 0.3wt.% 0.03wt.% average grain size α-Al decreases from 693.47 µm 264.13 (a...

Aluminum matrix composite is one of the most attractive metal composites. It a kind material with strong vitality emerging in response to needs modern scientific development. Compared traditional materials, aluminum composites have advantages low density, good electric conductivity and heat conductivity, wear resistance oxidation resistance, high specific strength stiffness, temperature treatment performance flexible preparation process, which make them widely used fields aviation,...