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Dynamic response of AlSi10Mg alloy fabricated by selective laser melting

机译：选择性激光熔化制备AlSi10Mg合金的动态响应

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摘要

The dynamic response of selective laser melting (SLM)-processed and sand cast AllOSiMg samples were studied in a series of planar impact experiments. It was found that the dynamic response of SLM-processed alloys is virtually independent of the processing orientation. The dynamic yield strength and tensile (spall) strengths of SLM-processed material exceeds those of the cast alloy by factors of two and four, respectively. It was found that with increase in the tensile strain rate (ε_1) the fracture mode of SLM-processed material changes from apparently ductile at strain rates below (ε_1)≈ 5 × 10~3s~(-1) to evidently brittle above this threshold. At approximately the same strain rate and at shear stress greater than 65 MPa, the mechanism governing the compressive (yield) strength of the SLM-processed alloy also changes from thermally-activated passage of obstacles by moving dislocations to dislocation over-barrier glide controlled by phonon viscous drag.
机译：在一系列平面冲击实验中，研究了选择性激光熔融（SLM）处理和砂铸AllOSiMg样品的动力响应。发现SLM加工合金的动态响应实际上与加工方向无关。经SLM处理的材料的动态屈服强度和拉伸（断裂）强度分别比铸造合金高2倍和4倍。研究发现，随着拉伸应变率（ε_1）的增加，SLM处理材料的断裂模式从在（ε_1）≈5×10〜3s〜（-1）以下的应变率下的明显延性转变为在该阈值以上的脆性。 。在大约相同的应变率和大于65 MPa的剪切应力下，控制SLM处理合金的压缩（屈服）强度的机理也从热激活的障碍物通过将位错移动到由高位滑行控制的位错滑移而改变。声子粘性阻力。

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  • 来源
    《Materials Science and Engineering》 |2017年第14期|364-370|共7页
  • 作者

    E. Zaretsky; A. Stern; N. Frage;

  • 作者单位

    Department of Materials Engineering, Ben-Gurion University of the Negev, P.O.B. 653, Beer-Sheva 8410501, Israel;

    Department of Materials Engineering, Ben-Gurion University of the Negev, P.O.B. 653, Beer-Sheva 8410501, Israel;

    Department of Materials Engineering, Ben-Gurion University of the Negev, P.O.B. 653, Beer-Sheva 8410501, Israel;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Dynamic response; Selective laser melting; AlSi10Mg alloy;

    机译：动态响应;选择性激光熔化;AlSi10Mg合金;

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