Corrosion stress relaxation in pure magnesium and die-cast Mg alloys

ผู้แต่ง

  • Yakov B. Unigovski Dept of Materials Engineering, Ben-Gurion University of the Negev
  • Leonid Riber Dept of Materials Engineering, Ben-Gurion University of the Negev
  • Emmanuel M. Gutman Dept of Materials Engineering, Ben-Gurion University of the Negev

คำสำคัญ:

pure magnesium, die-cast Mg alloys, stress relaxation, corrosive solutions, relaxation spectra

บทคัดย่อ

The effect of corrosive solutions on stress relaxation behavior of pure Mg and its alloys is studied. Pure magnesium shows a crucial corrosion stress relaxation in 3.5wt.% NaCl even at room temperature in comparison with tests in air. Die-cast Mg alloys AZ91D, AM50 and AS21 at room temperature show a relatively small stress decrease both in air and in different corrosive media. At elevated temperature, all studied die-cast Mg alloys show a strong stress relaxation in a 3.5 % NaCl corrosive solution. In a corrosive environment, the highest sensitivity to stress relaxation was observed both in the alloy with the highest Al content (AZ91D), and in AS21 alloy that contains two intermetallics (Mg17Al12 and Mg2Si). It is shown that the stress relaxation method manifests a high sensitivity to structural homogeneity of alloys, especially in corrosive solutions.

According to TEM investigations of pure Mg, an unloaded specimen comprises a few dislocations in the vicinity of such an obstacle as grain boundary. At a constant strain of about 4x10-4, dislocation networks were found with a sharply increasing quantity of dislocations.

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เอกสารอ้างอิง

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Pettersen, K. and Fairchild, S. 1997. Stress relaxation in bolted joints of die-cast magnesium components. SAE tech. paper series, Paper No. 970326 : Warrendale, Pa. : 23-31.

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2017-04-23

วิธีการอ้างอิง

[1]
Y. B. . Unigovski, L. Riber, และ E. M. . Gutman, “Corrosion stress relaxation in pure magnesium and die-cast Mg alloys”, J Met Mater Miner, ปี 17, ฉบับที่ 1, เม.ย. 2017.

ฉบับ

ปีที่ 17 ฉบับที่ 1 (2007)

บท

Original Research Articles

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ลิขสิทธิ์ (c) 2017 Journal of Metals, Materials and Minerals

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