工具轉(zhuǎn)速對攪拌摩擦加工Mg-Zn-Y-Zr耐熱鎂合金超塑性行為的影響

工具轉(zhuǎn)速對攪拌摩擦加工Mg-Zn-Y-Zr耐熱鎂合金超塑性行為的影響EFFECTS OF TOOL ROTATION RATES ON SUPERPLASTIC DEFORMATION BEHAVIOR OF FRICTION STIR PROCESSED Mg-Zn-Y-Zr ALLOY

在800-1600 rpm工具轉(zhuǎn)速和100 mm/min固定行進(jìn)速度的較寬熱輸入范圍內(nèi)，對6 mm厚的熱擠壓態(tài)Mg-Zn-Y-Zr耐熱鎂合金板進(jìn)行攪拌摩擦加工（FSP），獲得了由均勻、細(xì)小的等軸再結(jié)晶晶粒和細(xì)小、彌散的Mg-Zn-Y三元相（W相）構(gòu)成的FSP樣品。隨著工具轉(zhuǎn)速的增加，F(xiàn)SP樣品中W相被顯著細(xì)化且分布更加彌散，高角晶界（晶界錯配角 ≥ 15o）比例明顯增加，再結(jié)晶晶粒被細(xì)化。工具轉(zhuǎn)速的增加使超塑性變形的最佳應(yīng)變速率和延伸率均顯著增加，1600 rpm工具轉(zhuǎn)速的FSP樣品在1×10-2 s-1的高應(yīng)變速率和450 oC的變形溫度下，獲得了1200 %的最大延伸率。通過對超塑性變形數(shù)據(jù)進(jìn)行分析和超塑性樣品表面形貌觀察可以得出，不同轉(zhuǎn)速下所獲得的FSP樣品超塑性變形控制機(jī)制均以晶界滑移為主。隨著工具轉(zhuǎn)速的增加，超塑性動力學(xué)被明顯加速，在1600 rpm工具轉(zhuǎn)速的FSP樣品超塑性動力學(xué)與晶界滑移控制的細(xì)晶鎂合金超塑性本構(gòu)方程吻合。

Six millimeters thick as-extruded Mg-Zn-Y-Zr plates were subjected to friction stir processing (FSP) at relatively wide heat input range of rotation rates of 800 to 1600 rpm with a constant transverse speed of 100 mm/min, obtaining FSP samples consisting of homogeneous, fine and equiaxed dynamically recrystallized grains and fine and uniform Mg-Zn-Y ternary phase (W-phase) particles. With increasing rotation rate, within the FSP samples the W-phase particles were broken up and dispersed significantly and the recrystallized grains were refined slightly, while the fraction ratio of the high angle grain boundaries (grain boundaries misorientation angle ≥ 15o) was increased obviously. Increasing rotation rate resulted in an increase in both optimum strain rate and superplastic elongation. For the FSP sample obtained at 1600 rpm, a maximum elongation of 1200 % was achieved at a high-strain rate of 1×10-2 s-1 and 450 oC. Grain boundary sliding was identified to be the primary deformation mechanism in the FSP samples prepared at various rotation rates by superplastic data analyses and surfacial morphology observations. Furthermore, increasing rotation rate accelerated superplastic deformation kinetics significantly. For the FSP sample at 1600 rpm, superplastic deformation kinetics is in good agreement with the prediction by the superplastic consititutive equation for fine-grained magnesium alloys governed by grain boundary sliding.

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