检索结果-南通市图书馆

Weibull analysis of effect of T6 heat treatment on fracture strength of AM60B magnesium alloy

Transactions of Nonferrous Metals Society of China 2018年第1期28卷 20-29页

作者： A.H.SHEVIDI R.TAGHIABADI a.razaghian Department of Materials Science and Ceramic Engineering Imam Khomeini International University

The effect of T6heat treatment on the fracture strength and reliability of AM60B alloy was *** tensile specimens were poured at three different temperatures of670,685and700?C for different holding times of5,*** fluidity test was also conducted to determine the fluidity length under different pouring temperatures and holding *** to the results,the optimum pouring temperature and holding time were determined as685?C and10min,*** fractography of the tensile specimens reveals that the entrained oxides and oxide-related porosities are the main factors responsible for the reduction of fracture strength under the non-optimal casting *** Weibull statistical approach was used to quantify the scatter of fracture strength in as-cast and heat-treated *** this purpose,T6schedule was applied to the specimens prepared under the optimal casting *** is found that,despite minor effect on the average fracture strength,T6heat treatment improves the reliability of castings,where the Weibull modulus is increased by75%.According to the microstructural and fractography observations,this improvement is related to the evolution of more uniform microstructure and the elimination of coarse brittleβ-particles in heat-treated samples.

关键词： Mg.Al alloy AM60B alloy die-cast Weibull analysis fracture strength fluidity

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effect of Fe-impurity on tribological properties of Al-15Mg_2Si composite

引用

Transactions of Nonferrous Metals Society of China 2018年第6期28卷 1084-1093页

作者： A.NADIM R.TAGHIABADI a.razaghian M.T.NOGHANI M.H.GHONCHEH Department of Materials Science and Ceramic Engineering Imam Khomeini International UniversityQazvinIran School of Metallurgy and Materials Engineering Iran University of Science and TechnologyTehranIran

The effect of Fe-impurity（0.2%-2%, mass fraction） on the microstructure, dry sliding wear, and friction properties of Al-15 Mg2 Si composite was investigated using a pin-on-disk tester under the applied pressures of 0.25, 0.5 and 1 MPa at a constant sliding speed of 0.13 m/s. According to the results, Fe modified the primary Mg2 Si particles from irregular dendritic form to smaller particles with polyhedral shapes, refined the pseudo-eutectic structure, and led to the formation of hard b-Al5 Fe Si platelets in the matrix. In spite of hardness improvement by these microstructural changes, the resistance of the composite against dry sliding wear was impaired. SEM examination of the worn surfaces, wear debris, and subsurface regions confirmed the negative effect of b-phase on the tribological properties. It was found that b-particles were fractured easily, thereby decreasing the potential of the substrate to resist against sliding stresses and giving rise to the instability and easy detachment of tribolayer as large delaminated debris. The friction results also revealed that Fe slightly decreased the average friction coefficient, but increased the fluctuation in friction.

关键词： Al-Mg2Si in-situ composite tribology sliding wear friction

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Designing a Full Adder Circuit Based on Quasi-Floating Gate

引用

Energy and Power Engineering 2013年第3期5卷 57-63页

作者： Sahar Bonakdarpour Farhad razaghian Department of Electrical Engineering Azad University South Tehran Branch Tehran Iran

Since in designing the full adder circuits, full adders have been generally taken into account, so as in this paper it has been attempted to represent a full adder cell with a significant efficiency of power, speed and leakage current levels. For this objective, a comparison between five full adder circuits has been provided. Applying floating gate technology and refresh circuits in the full adder cell lead to the reduction of leakage current on the gate node. The simulations were accomplished in this paper, through HSPICE software and 65 nm CMOS technology. The simulation results indicate the considerable efficiency of power consumption, speed and leakage current in the full adder cell rather than other cells.

关键词： Floating Gate Transistor Full Adder Circuit Leakage Current Quasi Floating Gate Transistor Refresh Circuit

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

The Emergent Salt Diapirs in the East Zagros, Iran

引用

Open Journal of Geology 2015年第10期5卷 718-726页

作者： Ghazaleh razaghian Mehran Arian Department of Geology Damavand Branch Islamic Azad University Damavand Iran Department of Geology Science and Research Branch Islamic Azad University Tehran Iran

The emergent salt diapirs of the east Zagros, Iran have been investigated by their structural positions. The study area is including of Zagros orogeny belt and Persian Gulf that both of them have been formed on northeastern part of Arabian plate. There are 84 emergent salt diapirs that originated from Hormuz formation with Infra-Cambrian to Cambrian age. Based on location, shape and orientation of the emergent salt domes in the east Zagros hinterland and Persian Gulf foreland basin, internal motivation forces in the salt deposits has been predominant compared to later tectonic forces. In the other words, most of the emergent salt diapirs are pre-orogenic diapirs and they had got prominent role as pines in determining the shape and location of next structures during to the Zagros orogeny. Finally, Neogene continental collision has a supplementary role to diapirism and salt reactivation. However there are an evidence to syn-orogenic emergent diapirs that they have got an important role in the progressive deformation.

关键词： Emergent Diapirs Tectonics Zagros Iran

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：