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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 18    No. 5    October 2008

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Microstructure evolution of AZ91D induced by high energy shot peening
HOU Li-feng(侯利锋)1, 2, WEI Ying-hui(卫英慧)1, 2, LIU Bao-sheng(刘宝胜)2, XU Bing-she(许并社)1, 2

1. College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China;
2. Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education,Taiyuan University of Technology, Taiyuan 030024, China

Abstract:A nanostructured surface layer was fabricated on a AZ91D magnesium alloy by using a high-energy shot peening(HESP). HESP induced structure along the depth of the treated sample surface layer was characterized by means of X-ray diffractometer (XRD), transmission electron microscope(TEM) and high resolution transmission electron microscope(HRTEM). The experimental results show that a deformed layer of about 50 μm has formed after HESP treatment and the average grain size increases from about 40 nm in the surface layer to about 200 nm at the depth of 40 μm. The surface nanocrystallization can realize intercoordination of the dislocations slipping and dynamic recrystallization. The nanocrystalline grains have stacking faults and dislocation in their interiors. The microhardness of the top surface is about triplicate that of the coarse-grained matrix.

 

Key words: AZ91D magnesium alloy; high-energy shot peening(HESP); nanocrystalline

ISSN 1672-7029
CN 43-1423/U

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