Effect of Precipitation on Development of Recrystallization Texture in a 6061 Aluminum Alloy

Abstract

Three types of specimens, namely solution treated, peak aged and overaged specimens, were prepared from hot-rolled sheets of a commercial 6061 aluminum alloy, so that they contain precipitates different in size and distribution. These specimens were cold rolled to 95% reduction in thickness and then annealed at 300 C. The rolling texture and work hardening rate during cold rolling differed, depending on the state of the precipitate. In particular, no increase in hardness during rolling was observed in the peak aged specimen. The recrystallizations in the overaged and solution treated specimens were completed more rapidly than that in the peak aged specimen. This is interpreted to be due to pinning effect caused by precipitation and difference in driving force of recrystallization. In the overaged specimen, the recrystallization texture revealed a strong {100} h001i orientation, which has the favored orientation relationship with deformed matrix. In the peak aged specimen, the recrystallization texture revealed a {110} h111i orientation. The {100} h001i orientation was also formed, however, the intensity relative to random orientation was much weaker than that observed in the peak aged specimen.

Powder Metallurgy Production of Ti-2 Wt Pct Si Alloy: Structural, Mechanical, and Electrochemical Characterization of the Sintered Material

“…Both lattice parameters increase with sintering time. This result is expected, since it is well established that incorporating Si in substitutional positions in the hexagonal close-packed structure of Ti shrinks the unit cell, [42,43,50] and demonstrates that the supersaturated a-Ti solid solution loses Si due to Ti 3 Si intermetallic precipitation during sintering. The lattice parameters of the a-Ti solid solution after hot pressing process are greater than those of pure Ti (a = 0.2951 and c = 0.4684 nm), [51] likely due to high oxygen content in a-Ti phases obtained by MA.…”

“…At the sintering temperature (720°C), samples-with high accumulated energy from the MA process-quickly recrystallize, and then grow asymptotically, likely due to precipitation of Ti 3 Si slowing crystallite growth through the pinning effect. [53] For all sintering times studied, the apparent crystallite size did not exceed 100 nm.…”

“…[33] This technique has been used to synthesize equilibrium and non-equilibrium materials, such as amorphous alloys, [34] nanocrystalline materials, [35] intermetallic compounds, [36] and supersaturated solid solution. [37] Although MA techniques have been applied to the Ti-Si system, [38][39][40][41][42][43] there are very few reports of the same with Ti-rich Si alloys (Ti > 92 wt pct). Notably, our research group recently established that the MA process promotes the formation of a supersaturated a-Ti-Si solid solution in a Ti-2 wt pct Si system.…”

EFFECT OF HEAT TREATMENT ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF EXTRUDED SiC/6061 COMPOSITE

“…Specifically, there were fine particles contained Mg and Si and particles contained Cu, Fe and Si of irregular shape. It can be assume, that the particles contain Mg and Si are common constituent phase Mg 2 Si occurring in 6061 aluminium alloy [19]. It can be assume, that particles which contain Fe, Si and Cu were silicides of iron and copper.…”

Microstructural Features of Spray‐Deposited Cold Rolled Al Alloy

“…Therefore it is a valuable method to get purge of porosity. [6] Benum and Nes [7] and Kashihara and Inagaki [8] studied the effect of precipitates on texture evolution in aluminum alloys during rolling followed by solution treatment and aging. Ojha et al [9] have also studied the microstructure of spray deposited Al-Si alloys.…”