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降溫往復(fù)鐓粗-擠壓變形對Mg-Gd-Y-Zn-Zr合金晶粒細(xì)化及織構(gòu)變化的研究
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中北大學(xué)材料科學(xué)與工程學(xué)院,中北大學(xué)材料科學(xué)與工程學(xué)院,中北大學(xué)材料科學(xué)與工程學(xué)院,中北大學(xué)材料科學(xué)與工程學(xué)院,中北大學(xué)材料科學(xué)與工程學(xué)院

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Study on Grain Refinement and Texture Evolution of Mg-Gd-Y-Zn-Zr alloy processed by Repetitive Usetting-extrusion at decreasing temperature
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School of Material Science and Engineering,North University of China,School of Material Science and Engineering,North University of China,School of Material Science and Engineering,North University of China,School of Material Science and Engineering,North University of China,School of Material Science and Engineering,North University of China

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    摘要:

    本文在480°C降溫至370°C條件下,采用循環(huán)鐓?擠工藝對均勻化后的Mg-Gd-Y-Zn-Zr合金進(jìn)行變形,對循環(huán)鐓?擠變形過程中的合金微觀組織和織構(gòu)變化進(jìn)行研究。結(jié)果表明,隨著循環(huán)鐓?擠變形道次的增加,晶粒尺寸逐漸減小。在變形6道次后,累積應(yīng)變達(dá)到 8.4,得到了平均晶粒尺寸為 3.4 μm 的細(xì)小均勻的微觀組織。晶粒細(xì)化是由非連續(xù)動態(tài)再結(jié)晶和連續(xù)動態(tài)再結(jié)晶復(fù)雜共同作用引起的。另外,變形過程中,原始粗大晶粒內(nèi)的片層狀長程有序相(LPSO)發(fā)生扭折變形產(chǎn)生扭折帶,并在扭著帶處引起動態(tài)再結(jié)晶產(chǎn)生,分割原始粗晶,起到晶粒細(xì)化作用。結(jié)果還表明,一道次鐓?擠變形后,合金產(chǎn)生強(qiáng)的基面織構(gòu),隨著變形道次的增加,織構(gòu)強(qiáng)度有所減弱?？棙?gòu)弱化的原因是動態(tài)再結(jié)晶和加載力在軸向和徑向交替變化共同作用。

    Abstract:

    A homogenized Mg-13Gd-4Y-2Zn-0.5Zr (wt.%) alloy was subjected to repetitive upsetting-extrusion (RUE) process at decreasing temperature from 480 to 370℃. The microstructure and texture development of the alloy during the RUE process was investigated in current study. The results showed that average grain size decreased with increasing cumulative strain and decreasing temperature. Uniform ultrafine-grain structure with an average grain size of 3.4 μm was achieved after 6 passes, i.e., cumulative strain of 8.4. Results revealed that grain refinement was induced by a complicated combination of discontinuous dynamic recrystallization and continuous dynamic recrystallization. Kink of lamellar long period stacking order (LPSO) phases played an important role in the grain refinement through subdividing the coarse grains by inducing recrystallization evolved in the kink bands. After 1 pass of RUE, a strong basal texture was obtained. With increasing RUE passes, the texture was gradually weakened, which resulted from cooperative effect of DRX and the alternative change of loading directions (axial and radial) during RUE processing.

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張治民,杜玥,張冠世,于建民,閆釗鳴.降溫往復(fù)鐓粗-擠壓變形對Mg-Gd-Y-Zn-Zr合金晶粒細(xì)化及織構(gòu)變化的研究[J].稀有金屬材料與工程,2018,47(5):1422~1428.[Zhang Zhimin, Du Yue, Zhang Guanshi, Yan Zhaoming, Yu Jianmin. Study on Grain Refinement and Texture Evolution of Mg-Gd-Y-Zn-Zr alloy processed by Repetitive Usetting-extrusion at decreasing temperature[J]. Rare Metal Materials and Engineering,2018,47(5):1422~1428.]
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  • 收稿日期:2017-10-19
  • 最后修改日期:2017-12-12
  • 錄用日期:2017-12-15
  • 在線發(fā)布日期: 2018-06-08
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