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Effect of Heat Treatment on Structure and Mechanical Properties of Al-30 wt.% Si Alloys Refined and Modified with Sr+B+RE Xiaosong Li 1,a, Anhui Cai 2,b,* and Jijie Zeng 3,c 1,2,3 School of Mechanical Engineering, Hunan Institute of Science and Technology, Yueyang 414006, China, a songxli89@163.com, b cah1970@sohu.com, c jijiezeng@163.com Keywords: Heat Treatment; Sr+B+RE; Refined and Modified; Al-30 wt.% Si; Structure; Mechanical Properties Abstract.
On the basis of orthogonal experiment, the effect of heat treatment on structure and mechanical properties of Al-30 wt.% Si alloys refined and modified with Sr+B+RE has been investigated.
Separate modification can only improve its mechanical properties to some extents, the mechanical properties of hypereutectic Al-Si alloys after heat treatment will be greatly improved.
Table 1 Table 1 Level of orthogonal experimental factors Factors Level 1 2 3 Solution temperature /℃ 520 530 540 Holding time /h 6 7 8 The other samples were taken for measuring thermal conductivity of sample by steady-state method.
Solution time increased from 60min to 250min, silicon phase occurred necking down, fusing and granulation, This in conformity with which significantly improve the mechanical properties of the solid solution early.

The thermal conductivity of a material is determined by three factors: first, the grain size and dislocation density of the material, second, the thermal expansion mismatch and wetting properties of the matrix and filler materials, and third, defects such as holes and holes generated during sintering.
Mechanical Properties While mechanical properties are not practical targets for composites with high thermal conductivity, they are still important because the state of the interface between the filler and matrix determines both the composite's thermal and mechanical properties (thermal resistance of the interphase boundary) and in the manufacture and operation of composite products for thermal applications, mechanical properties are critical. 3.2.1.
Mechanical and thermal properties of various composites.
No Specimen Mechanical Properties Thermal properties Ref.
· Wear resistance of CMCs increase as the proportion of reinforcement increases, and is affected by sliding velocity, weight applied, and sliding distance, among other factors.

The results show that misalignment (valgus variation) could damage the articular cartilage because they increase the stress magnitude, that progressively produce articular cartilage damage and it enhances the osteoarthritis phenomenon due to mechanical factors.
Knee misalignment is considered one of the biomechanical key factors, factors that influence the progression of knee osteoarthritis [4].
During the progressive stages of the osteoarthritis, the menisci and the cartilage change their structures and their material properties.
Material properties for knee geometric components are presented in Table 2.
Conclusions The biomechanical behavior of human knee cartilages is important in order to understand the OA phenomenon due to mechanical factors, because it could be possible to find solutions to prevent or diminish the OA effects.

Large deformation and produce twins, lead to grain refinement and had strongly influence on mechanical property of ZK80 Mg alloy, as well as strong affected the mechanical properties of the alloy.
It’s very important to improve the microstructure and performance of magnesium alloy via plastic processing technology which can control or improve the microstructure and mechanical properties of magnesium alloys [6].
It can be seen from Fig. 4 that the mechanical properties of As-cast ZK80 Mg alloy by extrusion-die forged compound forming, and its tensile strength, yield strength, elongation increased 41.1%, 22.4%, 47% respectively。
Fig.4 Evolution on the mechanical properties of ZK80 magnesium alloy Evolution on fracture mechanism alloys.
(2) As-cast ZK80 Mg alloy via close-die pressing of extruded preformed was subjected to two three-stress, and its mechanical properties at room temperature has been significantly improved

It also reduces costs, improves mechanical properties, and enhances product efficiency [5].
This is also due to the influence of several other factors namely, material preparation, tool configuration, and also the sensitivity of the tool.
The more the addition of alloying elements, the better the mechanical properties.
The appearance of porosity defects will affect the value of the mechanical properties of an alloy to be incompatible [13].
“The Effect of Copper addition of The Mechanical and Electrical Properties of Al-Cu Alloy Casting”. (2017).

Effects of the Additives and Current Density on the Electrodeposition Behavior and Mechanical Properties of the Ni-SiC Composite Coatings Teck-Su Oh 1,a , Jae-Ho Lee1,b , Ji-Young Byun2.c, and Tae-Sung Oh 1,d 1 Dept.
In Ni-SiC composite coating, the SiC content is dependent on the surface properties of SiC particles.
As sulfuric acid has a strong dehydration force, addition of sulfuric acid in the Ni sulfamate bath changed the surface properties of SiC particles, affecting the codeposition behavior of SiC particles.
The surface and cross-sectional morphologies of the Ni-SiC composite coatings were observed using SEM, and their mechanical properties were characterized with micro-Vikers hardness.
As sulfuric acid has a strong dehydration force, addition of sulfuric acid in the Ni sulfamate bath may change the surface properties of SiC particles, affecting the codeposition behavior of SiC particles.

Mismatch of adherend, adhesive thickness, temperature variation which were the three key factors on the residual thermal stress were analyzed.
In order to reduce the residual stress and improve the properties of single lap joint, three factors have been taken into account to simulate the distribution of residual thermal stress.
Information about the stress-strain behaviors of adhesive and mechanical properties is necessary [7-10].
Table 1 and Fig.3 show the material properties and elastic modulus of adhesive, respectively.
Conclusion Numerical simulations based on the finite element method were used to analyze the factors which affect residual thermal stress, and the single lap joint was the main research object.

The purpose of this study is to increase knowledge in the mechanical properties of parts made of wood-plastic composite materials by using 3D printing.
Relative to weight –mechanical properties and the effect of the amount of fill on the properties are also determined.
The mechanical properties of 3D-printed specimens using FDM depend on various factors in addition to the properties of the printing media.
Pregger, Effect of layer orientation on mechanical properties of rapid prototyped samples, Mater.
Sweeney (Eds.), Mechanical Properties of Solid Polymers, 3rd ed., John Wiley & Sons, Ltd, West Sussex, United Kingdom, 2012, pp. 227-259

Influences of Process and Equipment on Filament Unevenness Jiangping Wanga, Zhihui Tianb, School of Mechanical Engineering, Xian Shiyou University, Xian, China ajpwang@xsyu.edu.cn, bzhtian@hotmail.com, Keywords: Polyester POY; Filament unevenness; Influence factors.
It is presented in this paper that the main factors which affect the filament unevenness in melt spinning.
The Influence of Melt Factors on Filament Unevenness The Effect of Melt Uniformity.
The Influence of Equipment Factors on Filament Unevenness The Effect of Metering Pump.
In production, the main factors causing amount fluctuations of sprayed melt are as following

Because of the excellent mechanical properties of Austempered Ductile Iron (ADI), track rollers can be made out of this material.
After the heat treatment, its mechanical properties are greatly improved, such as better strength, toughness, abrasion resistance, and its properties could be kept under a low temperature.
In this paper, the mechanical properties of 40Mn and suitable ADI material are compared, which is shown in table 1.
ADI materials The mechanical properties of ADI are greatly improved after the heat treatment.
Research on the influence and mechanism of the heat treatment parameters on mechanical properties of ADI [C]