scholarly journals Strengthening Mechanisms of Magnesium-Lithium Based Alloys and Composites

2016 ◽  
Vol 2016 ◽  
pp. 1-11 ◽  
Author(s):  
C. O. Muga ◽  
Z. W. Zhang
Keyword(s):  
Thermal Treatment ◽  
Dislocation Density ◽  
Thermomechanical Processing ◽  
Precipitation Strengthening ◽  
Strengthening Mechanisms ◽  
Engineering Applications ◽  
The Past ◽  
Treatment Processes ◽  
Solution Strengthening ◽  
Suitable Processing

Mg-Li based alloys are widely applied in various engineering applications. The strength of these alloys is modified and enhanced by different strengthening mechanisms. The strengthening mechanisms of these alloys and their composites have been extensively studied during the past decades. Important mechanisms applied to strengthening the alloys include precipitation strengthening, solution strengthening, grain and subgrain strengthening, and dislocation density strengthening. Precipitation and solution strengthening mechanisms are strongly dependent on composition of the alloys and thermal treatment processes, whereas grain and subgrain and dislocation density strengthening mechanisms majorly depend on thermomechanical processing. In this paper, recent studies on conventional processes for the strengthening of Mg-Li based alloys are summarized as they are critical during the alloys design and processing. Main strengthening mechanisms are objectively reviewed, focusing on their advantages and drawbacks. These can contribute to enhancing, initiating, and improving future researches for alloys design and suitable processing selection.

Effect of Ti Element on Microstructure and Properties of Cu-Cr Alloy

2015 ◽  
Vol 817 ◽  
pp. 307-311 ◽  
Author(s):  
Peng Chao Zhang ◽  
Jin Chuan Jie ◽  
Yuan Gao ◽  
Tong Min Wang ◽  
Ting Ju Li
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Spherical Shape ◽  
Precipitation Strengthening ◽  
Peak Hardness ◽  
Ti Alloy ◽  
Strengthening Mechanisms ◽  
Vacuum Melting ◽  
Solid Solution Strengthening ◽  
Solution Strengthening

The Cu-Cr and Cu-Cr-Ti alloy plates were prepared by vacuum melting and plastic deformation. The effect of slight Ti element on microstructure and mechanical properties of Cu-Cr alloy was discussed. The result shows that Cr particles with spherical shape precipitated from Cu matrix after aging. Plenty Ti atoms dissolved in the vicinity of Cr particles and there were still parts of solid solution Ti atoms in other regions. Improvements in peak hardness and softening resistance were achieved with the addition of Ti element in Cu-Cr alloy. The addition of 0.1 wt.% Ti element makes Cu-Cr alloy possess tensile strength of 565 MPa and hardness of 185.9 HV after aging at 450 °C for 120 min, which can be attributed to multiple strengthening mechanisms, i.e. work hardening, solid solution strengthening and precipitation strengthening.

The Grain Refining and Strengthening Mechanism of C-Mn Steel by CSP

2011 ◽  
Vol 261-263 ◽  
pp. 712-716 ◽  
Author(s):  
Chao Zhang ◽  
Run Wu ◽  
Chang Song ◽  
Yong Fu Zhang ◽  
Shu Li Li ◽  
...  
Keyword(s):  
Strengthening Mechanism ◽  
Rolling Process ◽  
Precipitation Strengthening ◽  
Physical Metallurgy ◽  
Grain Refining ◽  
Strengthening Mechanisms ◽  
Solution Strengthening ◽  
Dislocation Strengthening ◽  
Mn Steel ◽  
Grain Refinement Strengthening

The grain refining of C-Mn steel on CSP line was investigated in this paper. The grain size was about 100μm after rolling by stand F1 and then decreased all the way of the rolling process(stands F2-F6) to 15μm. The strengthening mechanisms, grain refinement strengthening, solution strengthening, precipitation strengthening and dislocation strengthening, were figured out to develop a physical metallurgy model for prediction of the properties. It was noted that there is an agreement between the predicted properties and the measured ones of the steel.

Superalloy Development for Aircraft Gas Turbines

1969 ◽  
Author(s):  
R. J. Quigg ◽  
H. E. Collins
Keyword(s):  
Solid Solution ◽  
Gas Turbines ◽  
Statistical Regression ◽  
Strengthening Mechanisms ◽  
Solid Solution Strengthening ◽  
Gamma Prime ◽  
The Past ◽  
Solution Strengthening ◽  
Nickel Base ◽  
Carbide Strengthening

The creep resistance of nickel-base superalloys has progressed consistently over the past two decades. These improvements have been accomplished through the use of three principal strengthening mechanisms, solid solution strengthening, intermetallic (gamma prime) strengthening, and carbide strengthening. Most recently statistical regression analysis has been employed to predict the influence of alloying ingredients in nickel, and an alloy (TRW-NASA VI A) has been designed through this procedure. Superalloys, along with appropriate cooling mechanisms, appear to be entrenched as the materials of construction for the hotter portions of aircraft gas turbines for at least the next ten years.

Precipitation strengthening mechanisms during natural ageing and subsequent artificial aging in an Al-Mg-Si-Cu alloy

2018 ◽  
Vol 724 ◽  
pp. 53-59 ◽  
Author(s):  
Shuoxun Jin ◽  
Tungwai Ngai ◽  
Gongwang Zhang ◽  
Tongguang Zhai ◽  
Shian Jia ◽  
...  
Keyword(s):  
Artificial Aging ◽  
Precipitation Strengthening ◽  
Natural Ageing ◽  
Strengthening Mechanisms ◽  
Cu Alloy

scholarly journals Multi-strengthening-mechanisms in a novel titanium alloy with (TiHf)5Si3 particle-reinforcement

2020 ◽  
Vol 321 ◽  
pp. 11078
Author(s):  
Yan Du ◽  
Jinwen Lu ◽  
Wei Zhang ◽  
Yusheng Zhang
Keyword(s):  
Dislocation Motion ◽  
Heat Treatments ◽  
Triple Junctions ◽  
Strengthening Mechanisms ◽  
Particle Reinforcement ◽  
Solid Solution Strengthening ◽  
Long Period ◽  
Solution Strengthening ◽  
Dislocation Strengthening ◽  
Particle Strengthening

The microstructure and mechanical properties of Ti-2Si-2Nb-2Fe-1Hf-1Ta-1W alloy with (TiHf)5Si3 particle-reinforcement and their underlying relations have been studied. Electron microscope observations and correlative statistical analysis have been made to analyze microstructure evolution with heat treatments. The (TiHf)5Si3 particles with 800 nm in diameter were found uniformly distributed at α/β boundaries and triple junctions and turned out to be stable even after heat treatments at high temperature for a long period, inhibiting grain growth and dislocation motion. In addition, multi-strengthening-mechanisms including particle strengthening, solid-solution strengthening, grain boundary strengthening and dislocation strengthening have been discussed.

Low-Temperature Thermal Treatment Processes

2007 ◽  
pp. 299-329 ◽  
Author(s):  
Lawrence K. Wang ◽  
Clint Williford ◽  
Wei-Yin Chen ◽  
Nazih K. Shammas
Keyword(s):  
Thermal Treatment ◽  
Low Temperature ◽  
Treatment Processes

Review and Applications of Machine Learning and Artificial Intelligence in Engineering

2020 ◽  
pp. 1-12
Author(s):  
Melda Yucel ◽  
Gebrail Bekdaş ◽  
Sinan Melih Nigdeli
Keyword(s):  
Neural Network ◽  
Artificial Intelligence ◽  
Machine Learning ◽  
Artificial Neural Network ◽  
Development Process ◽  
Current Trend ◽  
Engineering Applications ◽  
The Past ◽  
Applications Of Machine Learning ◽  
Basic Features

This chapter presents a summary review of development of Artificial Intelligence (AI). Definitions of AI are given with basic features. The development process of AI and machine learning is presented. The developments of applications from the past to today are mentioned and use of AI in different categories is given. Prediction applications using artificial neural network are given for engineering applications. Usage of AI methods to predict optimum results is the current trend and it will be more important in the future.

Predictive control vs. PID control of thermal treatment processes

2011 ◽  
pp. 163-174 ◽  
Author(s):  
M. Voicu ◽  
C. Lazar ◽  
F. Schonberger ◽  
O. Pastravanu ◽  
S. Ifrim
Keyword(s):  
Thermal Treatment ◽  
Predictive Control ◽  
Pid Control ◽  
Treatment Processes

A review of current and developing potable water treatment processes

2003 ◽  
Vol 217 (1) ◽  
pp. 11-23 ◽  
Author(s):  
D G Stevenson
Keyword(s):  
Water Treatment ◽  
Large Scale ◽  
Potable Water ◽  
Regulatory Requirements ◽  
Treatment Technology ◽  
The Past ◽  
Treatment Processes ◽  
The United Kingdom ◽  
Scale Of Operation ◽  
Potable Water Treatment

The changes in water treatment technology that have occurred within the United Kingdom over the past 25–30 years, together with the present direction of development, are reviewed. Water treatment for public supply differs from many other process technologies, notably in the large scale of operation, the longevity of the plant, the regulatory environment and the slow rate at which new processes can be introduced. Thus, many developments are initiated as a result of regulatory requirements rather than economic factors. Reliability is paramount, and this leads to mechanical simplicity.

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