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Wang D.,Taiyuan University of Technology | Zhang W.,Weichai Heavy Machinery Co. | Zong X.,Taiyuan University of Technology | Nie K.,Taiyuan University of Technology | And 2 more authors.
Materials Science and Engineering A | Year: 2014

With Ni addition, abundant long period stacking ordered (LPSO) phase appeared in as-cast Mg-Gd-Zn-Ni alloys. Ni not only participated in the formation of LPSO phase itself but also stimulated Zn to take part in. Simultaneously, the mechanical properties of the Ni added alloys, especially the ductility, were enhanced substantially. © 2014 Elsevier B.V.

Wang D.,Taiyuan University of Technology | Zhang J.,Taiyuan University of Technology | Zhang W.,Weichai Heavy Machinery Co. | Nie K.,Taiyuan University of Technology | And 4 more authors.
Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science | Year: 2015

The effects of 0.3 at. pct Al and x at. pct Sr (x = 0.0, 0.1, 0.2, 0.3) on the microstructure and mechanical properties of as-cast Mg96Gd3Ni1 alloy were investigated. With addition of 0.3 at. pct Al, new quaternary Mg-Gd-Ni-Al phases with peculiar rod-like and petal-like morphologies are uniformly distributed in the alloy. The angles between petals of the petal-like phase are all about 60 deg. The microstructure of the alloy is refined, leading to fine grain strengthening. The volume fraction of the long-period stacking ordered phase which is excellent reinforcement phase of Mg alloys increases significantly. Moreover, combined addition of 0.3 at. pct Al and 0.1 at. pct Sr refines the microstructure further and enhances the mechanical properties of the alloy simultaneously. © 2015, The Minerals, Metals & Materials Society and ASM International.

Zhang J.-S.,Taiyuan University of Technology | Wang D.,Taiyuan University of Technology | Zhang W.-B.,Weichai Heavy Machinery Co. | Pei H.-X.,Taiyuan Iron and Steel Group Co. | And 3 more authors.
Materials and Corrosion | Year: 2015

The effect of eutectic structure and long period stacking ordered (LPSO) structure on the corrosion resistance of Mg95.5Gd3.5Zn1 alloy has been investigated. The eutectic structure and LPSO phase were obtained by different heat treatments and their corrosion behavior and microstructures were examined by immersion test, electrochemical measurement, and SEM. It is suggested that the Mg95.5Gd3.5Zn1 alloy containing LPSO phase has a better corrosion resistance than that without LPSO phase. This is due to the smaller accelerating corrosion effect, which is caused by the contact between α-Mg and LPSO phase. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Xu P.-H.,Weichai Heavy Machinery Co. | Qin G.-Y.,Weichai Heavy Machinery Co. | Bi H.-X.,Weichai Heavy Machinery Co. | Xu J.-F.,Weichai Heavy Machinery Co. | Xu J.-Z.,Weichai Heavy Machinery Co.
Zhuzao/Foundry | Year: 2013

The large and heavy section ferrite ductile cast iron flywheel has been produced by designing chemical composition, smelting with high temperature and desulphurization treatment, complex nodular treatment with heavy rare earths magnesium, multiple-inoculating and pouring at low temperature etc., combining with the suitable foundry technologies and cooling in flask. The flywheel castings meet the EN-GJS-400-15 material quality requirements under as-cast condition. And the flywheel meets technical requirements of magnetic particle inspection and UT of spheroidization rate. The foundry technology is stable and reliable by production trial, and all flywheels have been up to standard.

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