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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.

Combining the contact elements into the two-scale homogenization method, the effective mechanical properties of nano-composites with a debonding interface are analyzed.
The basic material properties are shown in Table 1.
The effect of debonding length on effective mechanical properties Debonding interface shows the imperfect of the bond between nano-fiber and matrix, and it is the important factor to cause the nonlinear change of the effective mechanical properties for nano- composites.
The effect of interfacial elastic modulus on effective mechanical properties Interfacial elastic modulus also has great influences on the effective mechanical properties as shown in Fig.8.
The results show that it is limited to improve the effective mechanical properties by only increasing the interfacial elastic modulus. 2.4.

Influence of heat-treatment on mechanical properties and wear resistance of ultra-high Mn steel Yong-hong Liua, Jie Lia, Wei Shaoa Central Institute of R＆D, SANY Group, Changsha, China, 410100 alij73@sany.com.cn Keywords: ultra-high Mn steel; heat-treatment; mechanical properties; Abstract: The influence of heat-treatment on mechanical properties and wear resistance of ultra-high Mn steel was studied, micro-structure and fracture surface were analyzed by optical microscope(OM) and selected electron microscope(SEM).
According to the results, optimized heat-treatment makes improvement in mechanical properties, and dispersed tiny carbides precipitate on Austenite matrix instead of grain boundary contributes to the excellent mechanical properties and wear resistance.
Table 1 shows the mechanical properties at different heat-treatment.
According to the results, better mechanical properties, i.e., higher strength and higher impact toughness, could be reached by optimized heat-treatment III.
References [1] ZHOU Ting-dong, WEI Cheng-fu, LUAN Dao-cheng, The factors of influencing super high Manganese steel’s properties, Foundry, 50(2001) 632-633.

During the formation of mineralized phases, particle size may affect mechanical properties.
So particle size and distribution was one of important factors for mineralized enamel.
Besides particle size, other factors also affected the particle adherence, such as enamel surface roughness, complicated morphology of particle and so on.
Mechanical properties of Group 2 were close to the polished enamel and Group 3.
However, mechanical properties of Group 3 were the lowest among the Groups, one explanation that in the short time the smaller particles induced crystal nucleation slowly leading to insufficient mechanical properties.

China a568661351@qq.com, b*wangca@mail.tsinghua.edu.cn Keywords: geopolymer, polyacrylonitrile fibers, mechanical properties Abstract: This paper investigated mechanical properties and microstructure of metakaolin/slag based geopolymers reinforced by short polyacrylonitrile (PAN) fibers.
Mechanical properties of the geopolymers.
This agrees well with the mechanical properties tested in the above text.
Rubina,Mechanism of geopolymerization and factors influencing its development: A review, J.
Preparation and mechanical properties of polypropylene fiber reinforced calcined kaolin-fly ash based geopolymer, J.

The mechanical properties of Y-TZP are the highest ever reported for the all-ceramic materials.
Factors Affecting LTD According to researches, factors such as the mean grain size [33-39], the residual stress [40-43], the amount and stabilizer [44], the cubic phase [45] and the addition of Al2O3 [46-49] have a large effect on the LTD of Y-TZP ceramic.
A thermodynamics approach proposed by Lange helps to understand the role of grain size in affecting the LTD of Y-TZP [50].
Factors affecting the free energy components (∆GCH, ∆GE and ∆GS) would have a large effect on the stability of tetragonal zirconia, therefore on the LTD.
Therefore, alumina-zirconia composites combined with good mechanical properties and aging resistance are promising to be used in dentistry.

Frictional heating and associated temperature seriously affects the material chemical and physical - mechanical properties, and is one of the direct factors on the wear mechanism.
One of the important influence factors of the frictional heating is the sliding velocity.
It revealed that speed and heat transfer coefficient affect the coefficient of thermal distribution significantly.
So the partition of frictional heat flux between the rough solid A and plane solid B is assigned naturally according to their thermophysical properties of material.
The material properties of this model are given in Tables 1 [22-23].

The results showed that: 0.25mm sheet of polystyrene made of the thickness of the main raw material by injection molding process, and factors affecting the performance of the sheet, the better the performance of the film material process parameters.
Greatly improved the formation of chemical bonds can be made of polystyrene, and the compatibility between starch, thus ensuring the synthesized starch-based biodegradable material has a tensile strength, the material forming the basis for the future[7]. 2.1 Orthogonal Design Affecting the starch-based biodegradable packaging materials antibacterial properties of many factors, the experimental analysis of the information obtained, directly affect the test results, there are four underlying causes can be made of polystyrene dosage, amount of starch, toluene and acetone ratio and antibacterial agent delivery type[8].
In the case of normal temperature and pressure molding time was 12h, emphasis on the amount can be made of polystyrene, starch dosage and type of antimicrobial agents on the material properties, so the experimental design three factors, three levels of L9 (33) orthogonal test table .
Analysis and discussion 3.1 expandable polystyrene content on material properties Expandable polystyrene material tensile strength dosage is a major factor.
(5) toluene, acetone delivery ratio as well as the mechanical properties of the material degradation is not significant

We also investigate how annealing at 750°C affects the properties, microstructure, and phase composition of the welded joints.
Post-weld cooling rates also significantly influence phase transformation and final microstructure, affecting mechanical properties.
The mechanical properties was determined at normal temperature on the specimens, that were cut from the base and the weld metal.
Mechanical Properties.
Phase composition and mechanical properties Sample Nr.

This paper designed Poplar LVL production experiments under different process conditions, and measured the mechanical properties of poplar LVL specimens under different experimental conditions.
The result showed that, it is feasible that grey theory is used to analyze the influence level of production technology of poplar LVL on the mechanical properties.
Investigations show that, mechanical properties and engineering performance of LVL are affected by many factors such as wood species, veneer thickness and quality, processing variables, member size, in service environment and loading types [1-5].Different factors have different influence levels on the mechanical properties.
So it is feasible that grey relational analysis is used to analyze the influence level of production technology of poplar LVL on the mechanical properties.
This paper only had grey relational analysis of the influence level of four factors on the bending strength, the grey relational analysis of the influence level of other factors on the other mechanical properties remain further study.