Research on a New Type Grain Refiner Refining α-Al by Adding Molten State and Diluted Al-Ti-B-RE Master Alloy

2012 ◽  
Vol 535-537 ◽  
pp. 915-918
Author(s):  
Zheng Jun Wang
Keyword(s):  
Master Alloy ◽  
Second Phase ◽  
Grain Refining ◽  
X Ray Diffraction ◽  
Grain Refiner ◽  
X Ray ◽  
Second Phase Particles ◽  
Refining Performance ◽  
New Type ◽  
The Cost

Al-Ti-B-RE master alloy was prepared by casting of pure Ti. To improve the quality and reduce the cost of α- Al, the Al-Ti-B-RE master alloy was added to α-Al in molten and diluted state. The refining method had the advantages of shorter contact time and better refining effect. The array of the second phase particles was separated and the nucleating rate was greatly increased. Analysis and comparison of the refining effects were by X-ray diffraction (XRD), scanning electron microscopy (SEM) and optical microscopy (OM).The refining experiment showed that the molten and diluted state Al-Ti-B-RE by oneself had better grain refining performance and had obvious advantages over Al-Ti-B in domestic.

Study on the Preparation and Micro Structure of the Mg Containing Porous HA with Ultra-Fine Grain

2009 ◽  
Vol 610-613 ◽  
pp. 1132-1136
Author(s):  
Xing Yi Li ◽  
Xiang Cai Meng ◽  
Guo Quan Liu ◽  
Shi Dan Yuan
Keyword(s):  
Electron Microscopy ◽  
Photoelectron Spectroscopy ◽  
Chemical Precipitation ◽  
Second Phase ◽  
X Ray Diffraction ◽  
Micro Structure ◽  
X Ray ◽  
Fine Grain ◽  
Transmission Electron ◽  
Second Phase Particles

The Nano-HA powder were synthesized by chemical precipitation with Ca(H2PO4)2•H2O and Ca (OH)2 and porous HA was prepared by sintering with magnesium as pore-creator. Nano-HA powder and porous HA were characterized by wide angle X-ray diffraction, transmission electron microscopy(TEM), scanning electron microscopy (SEM), SEM in combination with energy dispersive X-ray spectroscopy (SEM-EDX), X-ray photoelectron spectroscopy. The experimental results show that HA powder synthesized by chemical precipitation is nanometer powder. Magnesium was ideal pore-creator for preparation of porous materials. The grain size of porous HA was sub-micron and MgO which existed in the grain boundary of HA as a second phase particles that played the roles of inhibiting the HA grain growth.

Effect of Temperature on the Performance of AlTiC Metal Alloys

2011 ◽  
Vol 339 ◽  
pp. 291-294
Author(s):  
Yong Feng Wang ◽  
Rui Li
Keyword(s):  
Pure Aluminum ◽  
Metal Alloys ◽  
Effect Of Temperature ◽  
Grain Refining ◽  
X Ray Diffraction ◽  
X Ray ◽  
Commercially Pure ◽  
Master Alloys ◽  
Refining Performance ◽  
Al3ti Particle

AlTiC master alloys have been prepared by Contact Reaction Method（CRM）.X-ray diffraction，SEM and EDS were used to analyse the AlTiC master alloys. It showed that morphology and distribution of TiC and Al3Ti particle have correspondingly changed with the transformation of temperature. As a result, the change in morphology and distribution of TiC and Al3Ti particle has considerably affected the gain refining performance of AlTiC master alloys. The result showed that it had excellent grain refining performance for commercially pure aluminum in 800°C.

scholarly journals Effect of CeO2 Size on Microstructure, Synthesis Mechanism and Refining Performance of Al-Ti-C Alloy

Materials ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 6739
Author(s):  
Yanli Ma ◽  
Taili Chen ◽  
Lumin Gou ◽  
Wanwu Ding
Keyword(s):  
Master Alloy ◽  
Pure Aluminum ◽  
Second Phase ◽  
Formation Temperature ◽  
Scanning Calorimetry ◽  
Synthesis Mechanism ◽  
Second Phase Particles ◽  
Master Alloys ◽  
Refining Performance ◽  
Commercial Pure Aluminum

The effects of CeO2 size on the microstructure and synthesis mechanism of Al-Ti-C alloy were investigated using a quenching experiment method. A scanning calorimetry experiment was used to investigate the synthesis mechanism of TiC, the aluminum melt in situ reaction was carried out to synthesize master alloys and its refining performance was estimated. The results show that the Al-Ti-C-Ce system is mainly composed of α-Al, Al3Ti, TiC and Ti2Al20Ce. The addition of CeO2 obviously speeds up the progress of the reaction, reduces the size of Al3Ti and TiC and lowers the formation temperature of second-phase particles. When the size of CeO2 is 2–4 μm, the promotion effect on the system is most obvious. The smaller the size of CeO2, the smaller the size of Al3Ti and TiC and the lower the formation temperature. Al-Ti-C-Ce master alloy has a significant refinement effect on commercial pure aluminum. When the CeO2 size is 2–4 μm, the grain size of commercial pure aluminum is refined to 227 μm by Al-Ti-C-Ce master alloy.

Analytical Microscopic Analysis of Precipitates in Hastelloy Alloy C-276

1981 ◽  
Vol 39 ◽  
pp. 280-281
Author(s):  
M. Raghavan ◽  
B. J. Berkowitz ◽  
J. C. Scanlon
Keyword(s):  
Microscopic Analysis ◽  
Scanning Transmission Electron Microscope ◽  
Second Phase ◽  
Precipitation Reaction ◽  
X Ray Diffraction ◽  
Corrosion Properties ◽  
X Ray ◽  
Transmission Electron ◽  
Second Phase Particles ◽  
Scanning Transmission

The present investigation was conducted to characterize the second phase particles in Hastelloy C-276 using an analytical Scanning Transmission Electron Microscope in order to understand their effect on the mechanical and Stress Corrosion properties of the alloy. Investigation in our 1aboratoryO) and previous published reports(2-4) have identified two types of precipitation reactions in this alloy. At temperatures in the range of 300-650°C, the alloy precipitates an ordered phase of the type Ni2(Cr, Mo)(1,2). This precipitation reaction is homogeneous with no preferential precipitation at the grain boundaries or twin boundaries. At temperatures above 650°C, several precipitate phases were observed to nucleate heterogeneously at boundaries and using X-ray diffraction techniques, the precipitates were previously identified as the μ, M6C and P phases(3-4). The present investigation was carried out to determine the composition of these second phase particles and this article describes the characterization of these precipitates using X-ray microanalysis and microdiffraction techniques.

scholarly journals In-Situ MMC Production through VXBY Intermetallics Formation in an Al Matrix

2003 ◽  
Vol 12 (1) ◽  
pp. 096369350301200
Author(s):  
C. Polyzos ◽  
S. Skolianos ◽  
H. Lefakis ◽  
D.N. Tsipas
Keyword(s):  
Aluminum Matrix ◽  
Xrd Analysis ◽  
Synthesis Temperature ◽  
Second Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
Second Phase Particles ◽  
Stirring Time ◽  
Al Matrix

The production of in-situ MMC's (Metal Matrix Composite) of an aluminum matrix with VxBy intermetallic compounds as the reinforcing phase has been investigated. The approach is modelled after that of Al-Ti-B alloys and salts added to an Al matrix to produce in-situ grain-refining TiB2. In the present work, V was used instead of Ti in an effort to investigate the possibility of an in-situ synthesis of a new, alternative, B-V reinforcing compound. Al, Al-V4.5wt% and Al-B5.5wt% alloys and a B-salt (KBF4) were used as starting materials. The synthesis temperature, the stirring time and the reaction holding time (RHT) were 1000°C, 5 min and 5 or 10 min respectively. The microstructure of the resulted MMC's consisted of second-phase particles, ranging in size between 1 and 10 μm, dispersed within an Al matrix. The second phase particles were identified by X-ray diffraction (XRD) analysis as VB2 and VB.

The Effect of Process Parameter on the Second Phase Particles in Al-Ti-B Master Alloys

2014 ◽  
Vol 900 ◽  
pp. 100-104
Author(s):  
Liang Jie Wei ◽  
Hua Hu ◽  
Zhi Liu Hu ◽  
Yan Jun Zhao
Keyword(s):  
Reaction Time ◽  
Process Parameters ◽  
Master Alloy ◽  
Pure Titanium ◽  
Process Parameter ◽  
Second Phase ◽  
Grain Refiner ◽  
Second Phase Particles ◽  
Master Alloys

Al-Ti-B master alloy is an efficient and practical aluminum grain refiner. This paper studies the effect of process parameter on the Second Phase Particles distributions and shape in Al-Ti-B Master Alloys by casting of pure titanium particale method. Emphatically studied three factors of feeding order, superheating temperature and reaction time , then the reasonable process parameters are put forward.

Effect of the Size of Powder on the Microstructures and Grain Refining Performance of AlTiC Alloys

2010 ◽  
Vol 146-147 ◽  
pp. 887-890
Author(s):  
Jing Cao ◽  
Yong Feng Wang ◽  
Chun Xue Wei
Keyword(s):  
Grain Size ◽  
Grain Refining ◽  
Contact Reaction ◽  
X Ray Diffraction ◽  
Reaction Method ◽  
X Ray ◽  
Master Alloys ◽  
Refining Performance ◽  
Al3ti Particle

AlTiC master alloys have been prepared by Contact Reaction Method（CRM）.X-ray diffraction，SEM and EDS were used to analyses the AlTiC master alloys. It showed that morphology and distribution of TiC and Al3Ti particle have correspondingly changed with the change of the size of powder. As a result, the change in morphology and distribution of TiC and Al3Ti particle has considerably affected the gain refining performance of AlTiC master alloys. The result showed that: when the grain size of Ti is much smaller, the effect of refinement is much better.

Deconvolution of morphological texture from crystallographic texture data

2002 ◽  
Vol 35 (3) ◽  
pp. 327-337 ◽  
Author(s):  
Gijs Langelaan ◽  
Laurent Delannay ◽  
Ignaas Verpoest ◽  
Paul Van Houtte
Keyword(s):  
Crystallographic Texture ◽  
316L Stainless Steel ◽  
Experimental System ◽  
Orientation Distribution ◽  
Second Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
Measurement Volume ◽  
Second Phase Particles ◽  
Weave Pattern

The physical properties of composite materials reinforced with fibres usually depend significantly on the orientation distribution of these fibres. The goal of this study is to develop a technique to measure the orientation distribution of second-phase particles which in themselves have a strong crystallographic texture. This permits the well known methods of pole-figure measurements to be used and the deconvolution of the `morphological texture function' from these data. In the current paper, the deconvolution procedure is presented and validated by simulations. Finally, the procedure is applied to an experimental system, which further confirms the validity of the approach. The simulations convoluted a morphological texture function with a crystallographic texture using a discrete representation of the orientation distribution function (ODF). After the convolution, the resulting ODF was converted to a series-expansion representation, which then permitted the deconvolution by an independent method. The results of the deconvolution return the original MTF, hence validating the procedure derived. The experimental system measured the crystallographic texture of 316L stainless-steel yarns woven into a fabric. The crystallographic texture obtained from straight yarns was used as the reference texture. The X-ray diffraction measurements reveal the weave pattern but with some ghosting errors. These are attributed to an insufficient measurement volume, which could be overcome by using radiation with a greater penetration, such as neutrons.

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