Fabrication of ceramic coatings from polysilazane/aluminum: Effect of aluminum content on chemical composition, microstructure, and mechanical properties

In this paper, Al-12.6%Si/Al63Cu25Fe12 composites were fabricated by method of casting. The microstructure and chemical composition of Al63Cu25Fe12 quasicrystal alloy and Al-12.6%Si alloy reinforced by the quasicrystal were studied, and the mechanical properties of Al-12.6%Si composite were also measured. The results show that almost single quasicrystalline phases exist in the samples which are cast with the 1300°C melt. Quickly enough cooling rate and appropriate melt temperature are necessary for the formation of the quasicrystalline phase. In addition, Al-12.6%Si composite has optimal mechanical properties when the amount of Al63Cu25Fe12 quasicrystal is 3 wt%.

Download Full-text

Effect of chemical composition and cooling modes after controlled rolling on the microstructure and mechanical properties of rolled plates from pipe steels with reduced manganese content

Problemy chernoi metallurgii i materialovedeniya ◽

10.54826/19979258_2021_4_42 ◽

2021 ◽

pp. 42-53

Author(s):

A. A. Kholodnyi ◽

Yu. I. Matrosov ◽

Ya. S. Kuznechenko ◽

M. V. Ilyichev ◽

D. I. Yusupov

Keyword(s):

Mechanical Properties ◽

Chemical Composition ◽

Manganese Content ◽

Controlled Rolling ◽

Pipe Steels ◽

Microstructure And Mechanical Properties ◽

Rolled Plates

Download Full-text

Effect of Al on microstructure and mechanical properties of as-cast Mg-8Gd-4Y-1Zn alloy

Anti-Corrosion Methods and Materials ◽

10.1108/acmm-10-2019-2189 ◽

2020 ◽

Vol 67 (1) ◽

pp. 101-105

Author(s):

Yongxin Zhou ◽

Qian Li ◽

Zhiguo Xing ◽

Renze Zhou ◽

Zhenhua Huang ◽

...

Keyword(s):

Mechanical Properties ◽

Tensile Strength ◽

Material Characterization ◽

Aluminum Content ◽

Gravity Casting ◽

Content Type ◽

Al Content ◽

Casting Technology ◽

Microstructure And Mechanical Properties ◽

Lpso Structure

Purpose This paper aims to investigate the effect of aluminum addition on the microstructure and mechanical properties of Mg-8Gd-4Y-1Zn alloy. Design/methodology/approach Mg-8Gd-4Y-1Zn-xAl (x = 0, 0.5, 1.0, 1.5, 2.0 Wt.%) alloys were prepared by the conventional gravity casting technology, and then microstructures, phase composition and mechanical properties were investigated by material characterization method, systematically. Findings Results show that the as-cast microstructure of Mg-8Gd-4Y-1Zn alloy mainly consists of a-Mg matrix as well as Mg12REZn (18 R LPSO structure), and island-like Mg3(RE, Zn) phase is distributed at the grain boundary. The addition of a small amount of Al (0.5 Wt.%) can decrease the content of island-like Mg3(RE, Zn) phase, but significantly increase the content of long-period stacking ordered (LPSO) structure, resulting in the improvement of both tensile strength and elongation of Mg-8Gd-4Y-1Zn alloy. However, the addition of excessive Al will consume Re element and decrease the amount of LPSO structure, leading to the decrease of tensile properties. When the content of Al is 0.5 Wt.%, the tensile strength and elongation are 225 MPa and 9.0% of Mg-8Gd-4Y-1Zn alloy, which are 14% and 29% higher than that of Mg-8Gd-4Y-1Zn alloy, respectively. Originality/value Adding aluminum to Mg-8Gd-4Y-1Zn alloy strengthens its mechanical properties. And the effect of Al content on the alloy strengthening. The formation mechanism of LPSO structure with different aluminum content was revealed.

Download Full-text