scholarly journals Study of an effect of promising cellulose components on the physico-mechanical properties and a burning rate of a combustible material for combustible cartridge cases produced according to the filtration casting technology

2020 ◽  
Vol 1666 ◽  
pp. 012054
Author(s):  
R V Fataliev ◽  
T A Eneikina ◽  
L A Kozlova ◽  
R F Gatina ◽  
Yu M Mikhailov
Keyword(s):  
Mechanical Properties ◽  
Burning Rate ◽  
Combustible Material ◽  
Casting Technology ◽  
Cartridge Cases

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

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.

Microstructure and Mechanical Properties of Aged Mg-12Gd-2Y-0.5Zr Alloy Addition with Sb

2011 ◽  
Vol 261-263 ◽  
pp. 693-696
Author(s):  
Ke Jie Li ◽  
Quan An Li
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Aging Treatment ◽  
Tensile Tests ◽  
Precipitation Strengthening ◽  
Aged Alloy ◽  
Long Period ◽  
Casting Technology ◽  
Alloy Addition ◽  
Solution Strengthening

The Mg-12Gd-2Y-0.5Sm-0.5Sb-0.5Zr (wt.%) alloy was prepared by casting technology. The microstructure was investigated after solution and aging treatment (i.e. T6 heat treatment). Tensile tests were performed at a crosshead speed of 1 mm/min at ambient and elevated temperature atmosphere. The results show that the aged alloy was mainly composed of α-Mg matrix, Mg5Gd phase and dispersed long-period ordered β' precipitates. At 523K, the alloy has shown the superior tensile strength (i.e. 345.5 MPa). The strength mechanism was solution strengthening of RE and precipitation strengthening of dispersive LPO structure β' and stable Mg5Gd precipitatesin Mg matrix.

scholarly journals Yttria- Stabilized Tetragonal Zirconia with Superior Mechanical Properties Prepared Using Gel Casting Technology and a Two-Stage Sintering Process

2021 ◽  
Author(s):  
Jing-Siang Jhan ◽  
Chih-Cheng Chen ◽  
Yu-Chi Liu ◽  
Hsing-I Hsiang
Keyword(s):  
Mechanical Properties ◽  
Relative Density ◽  
Grain Growth ◽  
Tetragonal Zirconia ◽  
Solid Content ◽  
Sintering Process ◽  
Two Stage ◽  
Casting Technology ◽  
Gel Casting ◽  
Superior Mechanical Properties

Abstract Yttria-stabilized tetragonal zirconia (YTZP) ceramics with high densification and superior mechanical properties were obtained using gel casting technology and a two-stage sintering process. Well-dispersed Nano-sized (94 nm) zirconia slurry with high solid content (45vol%) was prepared for gel casting using Dolapix CE64 as the dispersant. As the dispersed slurry was added epoxy monomer (EGDGE) and polymerization initiator (DPTA), Dolapix CE64 promoted gelling, leading to an abrupt increase in the slurry viscosity. As Dolapix CE64 was added into the slurry, its functional carboxyl groups reacted with EGDGE, resulting in a decrease in gelling incubation time and an increase in viscosity, hence, leading to gel casting failure. The addition of hydroquinone (HQ) into the slurry can be used to delay the polymerization and extend the gel casting working time. After gel casting, the temperature was raised to above 60o C to promote the polymerization, leading to an increase in the green strength.A two-stage sintering process was used to control the grain growth. The first stage sintering temperature was chosen at 1300oC, where the relative density reached 83%. In the second sintering stage, the temperature was lowered to 1240°C and soaked for 24 h to inhibit grain growth (mean grain size of 195 nm) and continue densification to a relative density of above 99%. Vickers hardness of 15.2GPa, fracture toughness of 7.8MPa.m1/2, and flexural strength of 771MPa can be obtained for the sample prepared using gel casting technology with a two-stage sintering process.

Innovative compound casting technology and mechanical properties of steel matrix syntactic foams

2021 ◽  
Vol 853 ◽  
pp. 156572 ◽  
Author(s):  
Quanzhan Yang ◽  
Jingchang Cheng ◽  
Yanpeng Wei ◽  
Bo Yu ◽  
Zhiquan Miao ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Steel Matrix ◽  
Syntactic Foams ◽  
Casting Technology ◽  
Compound Casting

scholarly journals Optimization of Squeeze Parameters and Modification of AlSi7Mg Alloy

2013 ◽  
Vol 13 (2) ◽  
pp. 113-116 ◽  
Author(s):  
A. Zyska ◽  
Z. Konopka ◽  
M. Łągiewka ◽  
M. Nadolski
Keyword(s):  
Mechanical Properties ◽  
Factorial Design ◽  
Squeeze Casting ◽  
Strength Increase ◽  
Regression Equations ◽  
Mould Temperature ◽  
Squeeze Pressure ◽  
Casting Technology ◽  
Modification Treatment ◽  
Main Factor

Abstract The paper present the examination results concerning mechanical properties of castings made of AlSi7MG alloy in correlation both with the most significant squeeze casting parameters and with the modification treatment. Experiments were planned and held according to the 23 factorial design. The regression equations describing the influence of the squeeze pressure, the mould temperature, and the quantity of strontium modifier on the strength and elongation of the examined alloy were obtained. It was found that the main factor controlling the strength increase is the squeeze pressure, while the plasticity (A5) of the alloy is affected most advantageously by modification. The application of modification treatment in squeeze casting technology enables for production of the slab-type castings made of AlSi7Mg alloy exhibiting strength at the level of 230 MPa and elongation exceeding 14%.

Effects of Different Size and Shaped Magnesium Particles on the Properties for Fuel Rich Solid Propellant

2013 ◽  
Vol 634-638 ◽  
pp. 1918-1921 ◽  
Author(s):  
Lin Quan Liao ◽  
Wei Qiang Pang ◽  
Hui Xiang Xu ◽  
Yong Hong Li ◽  
Xue Zhong Fan ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Rheological Properties ◽  
Burning Rate ◽  
Solid Propellant ◽  
Spherical Particles ◽  
Chemical Characteristics ◽  
Rate Performance ◽  
Percent Elongation ◽  
Lower Viscosity

The physic-chemical characteristics of spherical and coarse magnesium particles were determined. The rheological properties of Mg/HTPB mixtures were investigated. The burning rate performance and mechanical properties of fuel rich propellant were evaluated. The results show that the spherical magnesium particles could be dispersed in the HTPB binder with lower viscosity and yield stress than those of the coarse ones. The burning rate and pressure exponent of propellant with spherical particles increased compared with the coarse ones, and the percent elongation is much higher than that of coarse one, whereas, the tensile strength shows reverse.

scholarly journals The influence of continuous casting technology on the cleanliness of carbon steel

2021 ◽  
Vol 46 (1) ◽  
pp. 27-30
Author(s):  
Aida Imamović ◽  
Raza Sunulahpašić ◽  
Mirsada Oruč ◽  
Omer Kablar ◽  
Derviš Mujagić
Keyword(s):  
Mechanical Properties ◽  
Carbon Steel ◽  
Continuous Casting ◽  
Production Method ◽  
Carbon Steels ◽  
Casting Technology ◽  
Metallic Inclusions

The influence of the production method, i.e. casting technology on the cleanliness and thus the quality of carbon steels is best determined through the presence and type of non-metallic inclusions. A large number of inclusions, especially oxide and complex ones, can significantly affect the mechanical properties of carbon steels and limit their application for the production of finished products. This paper presents the influence of the presence, type and amount of non - metallic inclusions in B500B carbon steel according to ASTM / AISI produced by continuous casting technology without and with the application of stream protection.

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