-4~10-1s-1,最大變形量為40%的條件下,對鑄態(tài)Mg-2.5Sn(wt.%)和Mg-2.5Sn-0.2Y(wt.%)合金進(jìn)行壓縮變形。結(jié)合真應(yīng)力-應(yīng)變曲線、峰值應(yīng)力、顯微組織、本構(gòu)方程、DMM加工圖,研究了微量Y(0.2 wt.%)對鑄造Mg-Sn合金熱變形行為的影響。結(jié)果表明:微量Y的添加,在較低應(yīng)變速率時,會使Mg-Sn合金熱壓縮峰值應(yīng)力增加30%以上;但在較高應(yīng)變速率時,卻對其影響不大。會改變合金塑性變形機制的控制方式,即由擴散控制變?yōu)槲诲e的滑移和攀移。會抑制動態(tài)再結(jié)晶。會降低功率耗散系數(shù),擴大加工失穩(wěn)區(qū)。"/>

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微量Y(0.2 wt.%)對鑄造Mg-Sn合金熱變形行為影響
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1.西南交通大學(xué) 材料先進(jìn)技術(shù)教育部重點實驗室;2.重慶大學(xué) 國家鎂合金材料工程技術(shù)研究中心

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中央高校基本科研業(yè)務(wù)費科技創(chuàng)新項目(2682016CX072) 四川省國際科技合作與交流研發(fā)項目(18GJHZ0073)


Effect of Yttrium Addition (0.2 wt.%) on the Hot Compression Behavior of the As-cast Mg-Sn Alloy
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Affiliation:

1.Key Laboratory of Advanced Technologies of Materials,Ministry of Education of China,Southwest Jiaotong University,Chengdu;2.National Engineering Research Center for Magnesium Alloys,Chongqing University,Chongqing

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    摘要:

    采用MTS-CMT5105電子萬能試驗機,在溫度為250~400℃、初始應(yīng)變速率為10-4~10-1s-1,最大變形量為40%的條件下,對鑄態(tài)Mg-2.5Sn(wt.%)和Mg-2.5Sn-0.2Y(wt.%)合金進(jìn)行壓縮變形。結(jié)合真應(yīng)力-應(yīng)變曲線、峰值應(yīng)力、顯微組織、本構(gòu)方程、DMM加工圖,研究了微量Y(0.2 wt.%)對鑄造Mg-Sn合金熱變形行為的影響。結(jié)果表明:微量Y的添加,在較低應(yīng)變速率時,會使Mg-Sn合金熱壓縮峰值應(yīng)力增加30%以上;但在較高應(yīng)變速率時,卻對其影響不大。會改變合金塑性變形機制的控制方式,即由擴散控制變?yōu)槲诲e的滑移和攀移。會抑制動態(tài)再結(jié)晶。會降低功率耗散系數(shù),擴大加工失穩(wěn)區(qū)。

    Abstract:

    The uniaxial hot compression tests of casting Mg-2.5Sn (wt.%) and Mg-2.5Sn-0.2Y (wt.%) alloys were conducted on an MTS-CMT5I05 universal testing machine at temperatures ranging between 250~400℃ and the strain rate of 10-4~10-1 s-1 with strain of 40%. The effect of yttrium (Y) addition content (0.2 wt.%) on the hot compression behavior of the casting Mg-Sn alloys were investigated by true stress-strain curves, peak stress, microstructures, constitutive equation, and DMM processing maps. Results showed that the Y addition increased the peak stress of 30% at low strain rate, but made any sense at high strain rate. Deformation mechanism was changed from the lattice diffusion to dislocation slip and climb. In addition, Y retarded the dynamic recrystallization, reduced the efficiency of power dissipation and expanded the flow instability area.

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楊秋榮,曾迎,周明揚,黃廣號,任凌寶,陸嘉偉,尹冬弟,蔣斌.微量Y(0.2 wt.%)對鑄造Mg-Sn合金熱變形行為影響[J].稀有金屬材料與工程,2019,48(7):2275~2283.[Yang Qiurong, Zeng Ying, Zhou Mingyang, Huang Guanghao, Ren Lingbao, Lu Jiawei, Yin Dongdi, Jiang Bin. Effect of Yttrium Addition (0.2 wt.%) on the Hot Compression Behavior of the As-cast Mg-Sn Alloy[J]. Rare Metal Materials and Engineering,2019,48(7):2275~2283.]
DOI:10.12442/j. issn.1002-185X.20180095

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  • 收稿日期:2018-01-25
  • 最后修改日期:2018-03-12
  • 錄用日期:2018-04-04
  • 在線發(fā)布日期: 2019-08-01
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