Effect on P-Element Modification on Microstructure of Al-Based Alloy

2014 ◽  
Vol 556-562 ◽  
pp. 620-623
Author(s):  
Xiao Ming Wang ◽  
Sheng Zhu ◽  
Jian Zhong Cui ◽  
Qing Chang ◽  
Qing Feng Zhu
Keyword(s):  
Magnesium Alloy ◽  
Optical Microscopy ◽  
P Element ◽  
Primary Crystal ◽  
Casting Method ◽  
Silicon Phase ◽  
Crystal Silicon ◽  
High Silica ◽  
Dc Casting ◽  
Processing Control

To develop high wear-resistant protective materials for magnesium alloy, high-silica Al-based alloy modified via P-element was fabricated by DC casting method. Microstructure of ingot samples was observed by using optical microscopy (OM), etc. The results demonstrated that Al-Si-0.01%P alloy with unique microstructure and without defects such as voids and rarefaction might be generated by processing control. Owing to modification by Al-P interalloy, primary crystal silicon phase in hypereutectic Al-Si alloy were refined effectively. Its size in Al-18Si-0.01%P alloy decreased from 50μm to 20μm, and distributed uniquely than that in Al-18Si alloy. Al-P acted as heterogeneous core of primary crystal silicon phase, which was the main mechanism for Al-P interalloy to modify primary crystal silicon in Al-Si alloy.

Influence of Si Content on Microstructure and Erosion Properties of Al-Based Alloy

2014 ◽  
Vol 960-961 ◽  
pp. 109-112
Author(s):  
Xiao Ming Wang ◽  
Sheng Zhu ◽  
Jian Zhong Cui ◽  
Qing Chang ◽  
Qing Feng Zhu
Keyword(s):  
Magnesium Alloy ◽  
Chemical Elements ◽  
Eutectic Silicon ◽  
Testing Machine ◽  
Theoretical Principle ◽  
Primary Crystal ◽  
Silicon Phase ◽  
Crystal Silicon ◽  
Erosion Properties ◽  
Si Content

In order to develop new protective materials for magnesium alloy, Al-based alloys with different Si-content were fabricated by copper mold casting. Microstructure, erosion properties of the ingot samples were characterized or tested by using spectrum analysis, optical imcroscope, salt testing machine etc, respectively. The results indicated that the microstructure of Al-1.9Si-1.32Mg-0.40Mn was mostly dendritic crystal. That of Al-13Si consisted of α-Al, flaky eutectic silicon and primary crystal silicon. That of Al-18Si-0.01%P was consistent of a large proporation of primary crystal silicon phase, a part of eutectic silicon phase and a little of α-Al phase. With Si-content increasing, anti-corrosion properties of Al-based alloy gradually improved, which could provide theoretical principle to determine chemical elements of protective materials for magnesium alloy.

Microstructure Change of AZCa912 Magnesium Alloy Continuous Casting Bar by Hot Compression

2014 ◽  
Vol 783-786 ◽  
pp. 521-526 ◽  
Author(s):  
Akira Watazu ◽  
Naoki Omura ◽  
Kenji Miwa ◽  
Naobumi Saito
Keyword(s):  
Magnesium Alloy ◽  
Low Temperature ◽  
Continuous Casting ◽  
Direct Chill ◽  
Hot Compression ◽  
Casting Method ◽  
Microstructure Change ◽  
Metallic Luster ◽  
Grain Sizes ◽  
Compression Properties

AZCa912, 8.8mass%Al-0.68mass%Zn-0.25mass%Mn-1.9mass%Ca-Bal.Mg, continuous casting bars were formed and their hot compression properties were measured. AZCa912 alloy is a noncombustible magnesium alloy. AZCa912 bars 50 mm in diameter were formed by a direct chill continuous casting method. The surfaces of the bars had excellent metallic luster. Grain sizes in the bars were 148, and the dendrite arm spacing was 16.9 μm. Cracks on the side surfaces of the samples were formed by compression at 250-300°C, 0.01-1/s and 350°C, 1/s. However, inner cracks were not observed and-5 μm fine-grains were formed. Some samples had an unchanged casting structure after hot pressing, and the percent of the structure remaining unchanged decreased with low-temperature compression.

Effect of Electromagnetic Vibration on Microstructures of Semi-Continuous Casting AZ80 Magnesium Alloy Billet

2010 ◽  
Vol 146-147 ◽  
pp. 1797-1800
Author(s):  
Zhi Qiang Zhang ◽  
Qi Chi Le ◽  
Jian Zhong Cui ◽  
Shi Jie Guo
Keyword(s):  
Magnetic Field ◽  
Magnesium Alloy ◽  
Continuous Casting ◽  
Uniform Distribution ◽  
Alternating Magnetic Field ◽  
Stationary Magnetic Field ◽  
Electromagnetic Vibration ◽  
Az80 Magnesium Alloy ◽  
Dc Casting ◽  
Vibration Casting

Microstructures and macrosegregation of AZ80 magnesium alloy billets cast with and without the electromagnetic vibration were investigated. Compared with the conventional DC casting, microstructures of the billet have been greatly refined and the macrosegregation had been effectively reduced in electromagnetic vibration casting conditions. Increasing the electromagnetic vibration intensity, including both the stationary magnetic field and alternating magnetic field, leads to finer grains and more uniform distribution of solute elements in the billet.

Effect of Addition of Sc, Zr, Er on Microstructure of Al-Mg Ingot to Generate Welding Wire and Micro-Hardness of Surfacing Layer

2014 ◽  
Vol 940 ◽  
pp. 28-31
Author(s):  
Xiao Ming Wang ◽  
Sheng Zhu ◽  
Zhi Hao Zhao ◽  
Qi Wei Wang ◽  
Min Zhang
Keyword(s):  
Aluminum Alloy ◽  
Earth Element ◽  
Micro Hardness ◽  
Welding Wire ◽  
Casting Method ◽  
Hardness Tester ◽  
7A52 Aluminum Alloy ◽  
Dc Casting ◽  
Average Size ◽  
Formation System

Al-Mg welding wires applied extensively in aluminum alloy welding field.5183 ingot and 5356 ingot added Sc, Zr and Er were fabricated by DC casting method and extruded into welding wire, furtherly. Surfacing layer on 7A52 aluminum alloy prepared by using automatic surfacing formation system. Optical microscopy (OM) and 1600-5122VD MICROMET 5104 micro-hardness tester utilized to observe microstructure of 5183 and 5356 ingots, to measure micro-hardness of surfacing layer fabricated by using 5183 and 5356 welding wire with Sc, Zr, Er addition, respectively. The results indicated that, owing to addition of rare earth element, re-crystallization of Al-Mg extruded ingot to generate welding wire was restrained markedly; Microstructure was refined obviously when Sc added; And average size of the grains was about 10μm. Micro-hardness of surfacing layer improved after addition of Sc, Zr, Er element in the ingots.

Computer Modeling of DC Casting Magnesium Alloy WE43 Rolling Slabs

2014 ◽  
pp. 457-462 ◽  
Author(s):  
M. Turski ◽  
J. F. Grandfield ◽  
T. Wilks ◽  
B. Davis ◽  
R. DeLorme ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Computer Modeling ◽  
Dc Casting ◽  
Alloy We43

Influences of Complex Modification of RE and P on the Wear Resistance of Hypereutectic Al-24Si Alloy

2011 ◽  
Vol 284-286 ◽  
pp. 1647-1650
Author(s):  
Niu Can Liu ◽  
Jun Qing Li ◽  
Hai Dong Li
Keyword(s):  
Weight Loss ◽  
Wear Resistance ◽  
Wear Mechanism ◽  
Eutectic Silicon ◽  
Primary Silicon ◽  
Primary Crystal ◽  
Crystal Silicon ◽  
Unmodified Alloy ◽  
Improve Wear Resistance ◽  
Silicon Particles

The influences of RE and P complex modifications on microstructures and wear-resistance of hypereutectic Al-24Si alloy were studied. The results show that the complex modifications of P and RE make the coarse block primary crystal silicon refined and their edges and angles are passivated, the large needle-like network eutectic silicon be modified to the fine lamella or particle ones. The optimum modification effect occurs with 0.10%P and 0.9%RE. The complex modification of P and RE can also obviously improve wear resistance of hypereutectic Al-24Si alloy. When the tested alloys modified with 0.10%P and 0.9%RE, the optimal wear resistance of modified alloys is obtained. The weight loss is decreased to 3.9mg from 5.4mg of the unmodified alloy, decreased by 27.8%. The abrasive wear caused by the breaking of Si phase is dominant wear mechanism of the alloy. It can be attributed to the refinement of primary silicon and eutectic silicon particles and the increase of strength and ductibility of alloys caused by the complex modification of P and RE.

Sign in / Sign up

Export Citation Format

Share Document