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Improved tensile properties of a new aluminum alloy for high pressure die casting

机译：改进了用于高压压铸的新型铝合金的拉伸性能

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摘要

This paper investigates the effects of strain rate and test temperature on the tensile properties and deformation behavior of a recently developed high-ductility cast aluminum alloy Al-5Mg-0.6Mn. The as-cast alloy tested at room temperature and the lowest strain rate of ～ 1.67 × 10~(-4) s~(-1) shows the highest yield strength of ～212 MPa, ultimate tensile strength of ～357 MPa and elongation (～17.6X). Increasing strain rate reduces the ultimate tensile strength and ductility of the as-cast alloy. With the increasing of test temperature, the as-cast alloy shows significantly decreases in tensile strengths and improvements in elongation. The tensile failure of the alloy is mainly originated from the cracking and debonding eutectic particles. The Portevin-Le Chatelier effect occurs in the alloy tested at RT. Strain rate in current study ranges does not significantly affect the work-hardening behavior of the alloy. Increasing test temperature apparently reduces the strain-hardening exponent and coefficient For the alloy tested at RT, all tensile failures occur prior to global instability, indicating the existence of localized damage. In contrast, for the alloy tested at HT, the global instability occurs at strains below the logarithmic fracture strains, suggesting that there is still a postnecking damage.
机译：本文研究了应变速率和测试温度对最近开发的高延性铸造铝合金Al-5Mg-0.6Mn的拉伸性能和变形行为的影响。在室温下测试的铸态合金，最低应变率约为1.67×10〜（-4）s〜（-1），其最高屈服强度约为212 MPa，极限抗拉强度约为357 MPa，伸长率（ 〜17.6X）。应变速率的增加会降低铸态合金的极限抗拉强度和延展性。随着测试温度的升高，铸态合金的抗拉强度显着降低，伸长率得到改善。合金的拉伸破坏主要是由共晶颗粒的开裂和脱粘引起的。 Portevin-Le Chatelier效应发生在室温下测试的合金中。在当前研究范围内的应变速率不会显着影响合金的加工硬化行为。试验温度的升高明显降低了应变硬化指数和系数。对于在室温下进行试验的合金，所有拉伸破坏都在整体不稳定之前发生，表明存在局部损坏。相反，对于在高温下测试的合金，整体不稳定性发生在低于对数断裂应变的应变处，这表明仍存在颈缩损伤。

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  • 来源
    《Materials Science and Engineering》 |2016年第10期|376-390|共15页
  • 作者

    Peng Zhang; Zhenming Li; Baoliang Liu; Wenjiang Ding; Liming Peng;

  • 作者单位

    National Engineering Research Center of Light Alloys Net Forming and State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, Shanghai 200030, PR China;

    National Engineering Research Center of Light Alloys Net Forming and State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, Shanghai 200030, PR China;

    National Engineering Research Center of Light Alloys Net Forming Feng yang branch center, Chuzhou 233100, PR China;

    National Engineering Research Center of Light Alloys Net Forming and State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, Shanghai 200030, PR China;

    National Engineering Research Center of Light Alloys Net Forming and State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, Shanghai 200030, PR China;

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

    Al-5Mg-0.6Mn aluminum alloy; High pressure die casting; Tensile properties; Strain rate; High temperature;

    机译：Al-5Mg-0.6Mn铝合金;高压压铸;拉伸性能;应变率;高温;

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