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The Influence of Surface Nanocrystallization on The Aluminizing Behavior of AZ91D Magnesium Alloy
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Xi''an University of Architecture and Technology

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Key projects of science and technology research of the Ministry of Education ;Yulin Municipal Science and Technology Bureau project

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    Abstract:

    Surface aluminizing for magnesium alloy is an effective method to improve corrosion resistance. This research introduces surface nanocrystallization as the pre-process of aluminizing. AZ91D magnesium alloy is processed by high energy shot peening (HESP) to achieve surface nanocrystallization, and then vacuum solid state aluminum diffusion to obtain aluminized layer. The morphology of the aluminized layer is observed with Transmission electron microscopy (TEM) and Scanning electron microscopy (SEM). It shows that the surface of the nanocrystalline grain size of 100 nm was obtained after HESP of AZ91D magnesium alloy. After HESP, the depth of the aluminized layer is thicker than that of the aluminized layer without HESP. After diffusion of 12 hours under the temperature of 440 ℃, the depth of aluminized layer increases to 70 mm. The corrosion resistance of AZ91D magnesium alloys are characterized by electrochemical method. It shows that the aluminized layer obviously decreases the corrosion rate of AZ91D magnesium alloy. Therefore, high energy shot peening(HESP)was beneficial to surface aluminizing and can improve the corrosion resistance of magnesium alloy.

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[Zhang Conghui, Song Guodong, Wang Jing, ZhaoXu. The Influence of Surface Nanocrystallization on The Aluminizing Behavior of AZ91D Magnesium Alloy[J]. Rare Metal Materials and Engineering,2020,49(2):447~453.]
DOI:10.12442/j. issn.1002-185X.20180984

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History
  • Received:September 25,2018
  • Revised:October 08,2018
  • Adopted:October 24,2018
  • Online: March 12,2020
  • Published: