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Solid solution strengthening mechanism in high pressure die casting Al-Ce-Mg alloys

机译：高压模铸造铝合金中的固溶强化机理

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摘要

A series of Al-xCe (x = 2, 4, 6, 8, 10 wt%) and Al-8Ce-yMg (y = 0, 0.10, 0.25, 0.50, 0.75 wt%) alloys were prepared by high-pressure die casting. The introduced cerium element promoted the nucleation of <»-Al grains. Al_(11)Ce_3 phase served as the heterogeneous nucleation substrate of α-Al due to the small lattice mismatch of 6.72%. According to the results calculated by Nelson-Riley extrapolation function, the lattice constant of α-Al increased from 4.0511 A to 4.0540 A with the increasing of Mg content from 0 wt% to 0.75 wt%. Due to the solid solution strengthening effect of Mg atoms, the yield strength of Al-8Ce-yMg alloys and the hardness of α-Al matrix in the Al-8Ce-yMg alloys showed a parabolically increasing tendency, from 92 MPa to 115 MPa and 0.502 GPa-0.575 GPa, respectively. The work hardening capacity of Al-8Ce-yMg alloys was improved by the solid solution of Mg with the work hardening exponent increasing from 0.21 to 0.27. The solid solution of Mg atoms reduced the stacking fault energy of Al-8Ce-yMg alloys and suppressed the dynamic recovery process of the alloys during deformation process, which promoted the formation of dislocation tangles and dislocation networks in the α-Al matrix.
机译：通过高压模具制备一系列Al-Xce（X = 2,4,6,8,10wt％）和Al-8CE-YMG（Y = 0,0.10,0.25,0.50,0.75wt％）合金铸件。引入的铈元素促进了< - Al颗粒的成核。 Al_（11）CE_3相位作为α-A1的异质成核基底，由于小晶格错配6.72％。根据纳尔逊 - 莱利外推函数计算的结果，α-Al的晶格常数从4.0511A至4.0540A增加，含量从0wt％的Mg含量增加到0.75wt％。由于Mg原子的固体溶液强化作用，Al-8Ce-YMG合金的屈服强度和Al-8CE-YMG合金中的α-Al基质的硬度表现出抛物线上增加的趋势，从92MPa到115MPa和0.502 GPA-0.575 GPA。通过Mg的固体溶液改善了Al-8CE-YMG合金的加固能力，其硬化指数从0.21增加到0.27。 Mg原子的固溶体降低了Al-8CE-YMG合金的堆叠故障能量，并在变形过程中抑制了合金的动态回收过程，这促进了α-Al基质中位错缠结和位错网络的形成。

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  • 来源
    《Materials Science and Engineering》 |2021年第22期|141109.1-141109.10|共10页
  • 作者

    Bo Hu; Beibei Quan; Dejiang Li; Xueyang Wang; Zixin Li; Xiaoqin Zeng;

  • 作者单位

    National Engineering Research Center of Light Alloy Net Forming School of Materials Science and Engineering Shanghai Jiao Tong University 800 Dongchuan Road Shanghai 200240 China;

    National Engineering Research Center of Light Alloy Net Forming School of Materials Science and Engineering Shanghai Jiao Tong University 800 Dongchuan Road Shanghai 200240 China;

    National Engineering Research Center of Light Alloy Net Forming School of Materials Science and Engineering Shanghai Jiao Tong University 800 Dongchuan Road Shanghai 200240 China The State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong University 800 Dongchuan Road Shanghai 200240 China;

    National Engineering Research Center of Light Alloy Net Forming School of Materials Science and Engineering Shanghai Jiao Tong University 800 Dongchuan Road Shanghai 200240 China;

    National Engineering Research Center of Light Alloy Net Forming School of Materials Science and Engineering Shanghai Jiao Tong University 800 Dongchuan Road Shanghai 200240 China;

    National Engineering Research Center of Light Alloy Net Forming School of Materials Science and Engineering Shanghai Jiao Tong University 800 Dongchuan Road Shanghai 200240 China The State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong University 800 Dongchuan Road Shanghai 200240 China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Al-Ce-Mg alloys; High pressure die casting; Lattice constant; Solid solution strengthening;

    机译：Al-Ce-Mg合金;高压压铸;格子常数;固溶强化;

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