scholarly journals Concurrent effects of various B additions on grain refinement, Fe intermetallics morphologies, and ductility evolution of Al-7.5Si-0.55 Mg (A357) cast alloy

2020 ◽  
Vol 2 (12) ◽  
Author(s):  
Ghulam Asghar ◽  
Lingyang Yuan ◽  
Panwen Han ◽  
Penghuai Fu ◽  
Liming Peng
Keyword(s):  
Grain Refinement ◽  
Cast Alloy ◽  
B Additions ◽  
Fe Intermetallics

The influence of gadolinium on Al–Ti–C master alloy and its refining effect on AZ31 magnesium alloy

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Wenxue Fan ◽  
Hai Hao
Keyword(s):  
Mechanical Properties ◽  
Magnesium Alloy ◽  
Grain Refinement ◽  
Magnesium Alloys ◽  
Master Alloy ◽  
Cast Alloy ◽  
Az31 Magnesium Alloy ◽  
Synthesis Mechanism ◽  
Refining Effect ◽  
Master Alloys

Abstract Grain refinement has a significant influence on the improvement of mechanical properties of magnesium alloys. In this study, a series of Al–Ti–C-xGd (x = 0, 1, 2, 3) master alloys as grain refiners were prepared by self-propagating high-temperature synthesis. The synthesis mechanism of the Al–Ti–C-xGd master alloy was analyzed. The effects of Al–Ti–C-xGd master alloys on the grain refinement and mechanical properties of AZ31 (Mg-3Al-1Zn-0.4Mn) magnesium alloys were investigated. The results show that the microstructure of the Al–Ti–C-xGd alloy contains α-Al, TiAl3, TiC and the core–shell structure TiAl3/Ti2Al20Gd. The refining effect of the prepared Al–Ti–C–Gd master alloy is obviously better than that of Al–Ti–C master alloy. The grain size of AZ31 magnesium alloy was reduced from 323 μm to 72 μm when adding 1 wt.% Al–Ti–C-2Gd master alloy. In the same condition, the ultimate tensile strength and elongation of as-cast alloy were increased from 130 MPa, 7.9% to 207 MPa, 16.6% respectively.

scholarly journals Effect of Grain Refinement on the Dynamic, Mechanical Properties, and Corrosion Behaviour of Al-Mg Alloy

Metals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1825
Author(s):  
Haitham M. Ahmed ◽  
Hussin A. M. Ahmed ◽  
Mohammed Hefni ◽  
Essam B. Moustafa
Keyword(s):  
Mechanical Properties ◽  
Grain Refinement ◽  
Corrosion Behaviour ◽  
Cast Alloy ◽  
Dynamic Properties ◽  
Damping Ratio ◽  
Xrd Analysis ◽  
Optical Microscope ◽  
Mg Alloy ◽  
Resonance Frequencies

In this investigation, aluminium Al-2.5% Mg cast alloy was modified by adding 0.5 Ti and 0.1 B wt % modifiers to investigate their impact on the dynamic behaviour, as well as the mechanical and microstructure properties. The dynamic properties were analysed experimentally using a free vibration impact test and predicted using finite element methods. This study used a high-resolution polarised optical microscope to analyse the microstructure of the studied alloys and X-ray Powder Diffraction (XRD) analysis to determine the developed phases. Microstructure and mechanical properties were mostly enhanced as a result of grain refining during solidification and through the metal segregation process. The microstructure analysis of the modified alloy showed a significant improvement in the grain refinement; hence, the grains were 10 times finer than the cast alloy. The modified Al-2.5% Mg/Ti-B alloy demonstrated reduced inter-granular corrosion (IGC) than the Al-2.5% Mg standard cast alloy. By incorporating Ti-B modifiers into the composition of the cast Al-Mg alloy, the ultimate tensile strength (UTS), strain (ε), and hardness values (HV) were increased by 30.5%, 100%, and 18.18%, respectively. The dynamic properties of the modified alloy showed an enhancement in the resonant (fn) and damping ratio (ζ) by 7% and 68%, respectively. The predicted resonance frequencies of the investigated alloys showed results close to the experimental dynamic tests.

A new approach to grain refinement of an Mg–Li–Al cast alloy

2010 ◽  
Vol 492 (1-2) ◽  
pp. 95-98 ◽  
Author(s):  
B. Jiang ◽  
D. Qiu ◽  
M.-X. Zhang ◽  
P.D. Ding ◽  
L. Gao
Keyword(s):  
Grain Refinement ◽  
Cast Alloy ◽  
New Approach

The effect of addition of cerium on the grain refinement of Mg–3Al–1Zn cast alloy

2013 ◽  
Vol 28 (19) ◽  
pp. 2694-2700 ◽  
Author(s):  
Bin Jiang ◽  
Ying Zeng ◽  
Mingxing Zhang ◽  
Jichao Liao ◽  
Fusheng Pan
Keyword(s):  
Grain Refinement ◽  
Cast Alloy ◽  
Image Position

Abstract

Effects of Hot Extrusion on Microstructure, Texture and Mechanical Properties of Mg-5Li-3Al-2Zn Alloy

2013 ◽  
Vol 773-774 ◽  
pp. 218-225
Author(s):  
Le Gan Hou ◽  
Rui Zhi Wu ◽  
Ji Qing Li ◽  
Jing Huai Zhang ◽  
Mi Lin Zhang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Properties ◽  
Grain Refinement ◽  
Cast Alloy ◽  
Hot Extrusion ◽  
Eutectic Structure ◽  
Basal Texture ◽  
Lamellar Eutectic ◽  
Lamellar Eutectic Structure

This work mainly studied the effects of hot extrusion on microstructure, texture and mechanical properties of Mg-5Li-3Al-2Zn alloy. The results show that the microstructures of as-cast and as-extruded alloys both consist of α-Mg matrix and lamellar eutectic structure (α-Mg and AlLi phases). During the hot extrusion, the large eutectic structure of as-cast alloy was crushed into small eutectic structure and the grains were effectively refined. A {0002} basal texture was formed after hot extrusion. The as-extruded alloy exhibits remarkably improved tensile properties, which is mainly attributed to the grain refinement and the formation of texture.

Control of Microstructure by MaxStrain Device

2013 ◽  
Vol 762 ◽  
pp. 55-61
Author(s):  
Stan T. Mandziej ◽  
Marc Ruggeri
Keyword(s):  
Grain Refinement ◽  
Single Phase ◽  
Precipitation Hardening ◽  
Cast Alloy ◽  
Strain Rates ◽  
Metallic Materials ◽  
Plastic Deformations ◽  
Ultrafine Grained ◽  
Pure Metals ◽  
Multi Phase

Grain refinement should increase strength of metallic materials in a predictable manner. However, in applications of severe plastic deformations for this purpose, limits have been observed due to self-recovery and strain-induced precipitation assisted by generation of adiabatic heat. Pure metals and single-phase alloys have not been the best candidates for achieving ultrafine-grained microstructures therefore more often precipitation-hardening multi-phase alloys have been used in SPD experiments. To generate ultrafine-grained microstructures by accumulated multiple compressive strains executed at various strain rates during programmed thermal cycles the MaxStrainTM device was developed for GleebleTM physical simulator. This paper deals with processing of Al-6061 wrought alloy and Al-319 cast alloy by the MaxStrain device, and describes obtained microstructures.

scholarly journals Enhancement of Fluidity and Mechanical Properties of Al – Si cast Alloy

2019 ◽  
Vol 9 (2) ◽  
pp. 246-251
Keyword(s):  
Mechanical Properties ◽  
Grain Refinement ◽  
Copper Content ◽  
Cast Alloy ◽  
Base Material ◽  
Testing Conditions ◽  
Weight Percentage ◽  
Grain Sizes ◽  
Casting System ◽  
Different Temperatures

The aim of the study is to investigate the fluidity and mechanical properties of the Al-Si alloy by varying the copper content at three different temperatures with the effect of grain refinement. In this present examination a humble endeavour has been made to know the properties with an ease strategy for sand casting system. Al- Si aluminium alloy is chosen as the base material and copper powder; grain refinement and scrap were added as the compositions. The investigation has been furnished by variying the weight percentage of copper (0-4%), scrap (20-40%) and grain refinement (0-0.4%). Test examples were exposed to various testing conditions and properties have been upgraded. The tensile strength of the material increases with increase of percentage of copper content and the fluidity is balanced by addition of grain refinement. The comparison between microstructure images at 0% copper and 4% copper shows the variation of grain sizes.

The Effect of Grain Refinement on the Room-Temperature Ductility of As-Cast Fe3Al-Based Alloys

1994 ◽  
Vol 364 ◽  
Author(s):  
S. Viswanathan ◽  
V. K. Andleigh ◽  
C. G. McKamey
Keyword(s):  
Grain Refinement ◽  
Room Temperature ◽  
Maximum Stress ◽  
Cast Alloy ◽  
Room Temperature Ductility ◽  
Bend Tests ◽  
Point Bend ◽  
Carbon Additions ◽  
Cast Condition ◽  
Strength And Ductility

AbstractFe3Al-based alloys exhibit poor room temperature ductility in the as-cast condition. In this study, the effect of grain refinement of the as-cast alloy on room-temperature ductility was investigated. Small melts of Fe-28 at. % Al-5 at. % Cr were inoculated with various alloying additions and cast into a 50- × 30- × 30-mm graphite mold. The resulting ingots were examined metallographically for evidence of grain refinement, and three-point bend tests were conducted on samples to assess the effect on room-temperature ductility. Ductility was assumed to correlate with the strain corresponding to the maximum stress obtained in the bend test. The results showed that titanium was extremely effective in grain refinement, although it severely embrittled the alloy in contents exceeding 1%. Boron additions strengthened the alloy significantly, while carbon additions reduced both the strength and ductility. The best ductility was found in an alloy containing titanium, boron, and carbon.

scholarly journals Corrosion Behaviour of Al-Si Cast Alloy Reinforced with Titanium diboride (TiB2) and Scandium (Sc)

2019 ◽  
Vol 3 (2) ◽  
pp. 1-8
Author(s):  
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Rate ◽  
Grain Refinement ◽  
Titanium Diboride ◽  
Acidic Medium ◽  
Corrosion Behaviour ◽  
Cast Alloy ◽  
Resistance Rate ◽  
Acidic Solutions ◽  
Corrosion Rates

The aluminium-silicon (Al-Si) based on Metal Matrix Composites (MMCs) is widely used in lightweight constructions and transport applications requiring a combination of high strength and ductility. A grain refinement plays a crucial role in improving characteristics and properties of Al alloys. In this investigation, titanium diboride (TiB2) and scandium (Sc) inoculants were added to the Al-Si alloys for grain refinement of an alloy. In this investigation, the corrosion resistance rate of Al-Si cast alloy reinforced by TiB2 and Sc were measured by potentiostat (AUTOLAB) instrument. The aim of this research is to investigate the corrosion rate for Al-Si-TiB2-Sc composites that immersed in different concentration of acidic solutions. Besides, the immersion time of acidic solutions also was investigated. All the samples were prepared accordingly for ASTM standard by the composition of 6.0 wt% TiB2 and 0.6wt% Sc. All the samples undergo cold mounting technique for easy handling on corrosion tests. Then the samples were immersed in two different concentrations acidic medium solutions, which were 0.1.and 1.0 M hydrochloric acids (HCl). The corrosion rate also was investigated for immersion samples of 1.0 M HCl for 21 days. From the results obtained, added TiB2 and Sc onto Al-Si alloy gave the better properties in corrosion resistance. Corrosion rates to reduce when the samples were immersed in a lower concentration of acidic medium, 0.1 HCl. However, there are some significant on the result but it still following the corrosion rates trend. Thus, improvements to reinforcement content need to be done in further research to cover the lack of this corrosion rates trend.

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