Effect of Sr on Grain Refinement of Mg–3%Al Alloy Containing Trace Fe by Carbon-Inoculation

2016 ◽  
Vol 32 (12) ◽  
pp. 1297-1302 ◽  
Author(s):  
Jun Du ◽  
Yutong Shi ◽  
Mingchuan Zhou ◽  
Wenfang Li
Keyword(s):  
Grain Refinement ◽  
Al Alloy ◽  
Carbon Inoculation

Effects of Mn Addition and Addition Sequence on Carbon Inoculation of Mg-3%Al Alloy

2012 ◽  
Vol 430-432 ◽  
pp. 681-686 ◽  
Author(s):  
Jun Du ◽  
Ming Hua Wang ◽  
Wen Fang Li
Keyword(s):  
Intermetallic Compound ◽  
Grain Refinement ◽  
Phase Structure ◽  
Al Alloy ◽  
Coating Film ◽  
Obvious Effect ◽  
Grain Coarsening ◽  
Carbon Inoculation

The Mg-3% Al melt was treated by carbon inoculation and Mn addition. The effects of Mn addition and addition sequence on the grain refinement were investigated. The effect of Mn on the grain refinement of Mg-3 %Al alloy by carbon inoculation was closely associated with the operating sequence of carbon inoculation and Mn addition.Mn has no obvious effect on the grain refinement under the condition that Mn pre-existed in the Mg-Al melt before carbon inoculation. However, Mn played an inhibiting role under the condition that the Mg-Al melt had been inoculated by carbon before Mn addition. The Al4C3 particles should act as potent nucleating substrates for Mg grains in the sample treated by carbon inoculation. However, the Al-C-Mn particles with Al4C3 coating film could be observed in the sample treated by Mn addition and then carbon inoculation. These particles with duplex phase structure should also act as potent nucleating substrates for Mg grains, resulting in grain refinement. The nucleating potency of most Al4C3 particles was possibly poisoned by the formation of Al-Mn-rich coating film or the Al-C-Mn intermetallic compound, resulting in grain coarsening in the samples treated by carbon inoculation before Mn addition.

An Investigation on Duplex Nucleation in AZ91 Magnesium Alloy and Its Influence on High Temperature Mechanical Properties

2018 ◽  
Vol 140 (4) ◽  
Author(s):  
A. Saber ◽  
R. Haghayeghi ◽  
H. Najafi ◽  
Peiman Shahbeigi-Roodposhti
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Grain Refinement ◽  
Al Alloy ◽  
Grain Refiner ◽  
Az91 Magnesium Alloy ◽  
High Temperature Mechanical Properties ◽  
Nucleation Sites ◽  
Refinement Mechanism ◽  
Carbon Inoculation

The grain refinement of Mg–Al alloy AZ91 via carbon inoculation, including the significant role of Mn in advanced nucleation, was analyzed, and the corresponding mechanical properties and aging behavior were investigated. To this end, various amounts of C were added into the liquid at the desired temperatures. Al8Mn5 particles, which are suitable nucleation sites for α-Mg, were identified as the primary grain refiners. In situ particle formation, along with appropriate wetting and a suitable orientation relationship (OR), facilitated the grain refinement mechanism. Al4C3 particles contributed to heterogeneous nucleation by providing suitable Al8Mn5 nucleation sites. Mn removal resulted in poor grain refinement in the Mg–Al alloy. The Hall–Petch relationship, high-temperature tensile behavior, and aging mechanism of the samples refined by 1 wt % C addition (as the best grain refiner) are discussed and compared with industrial practice.

Influence of Fe on the Formation of Nucleation in Carbon-Inoculated Mg-3%Al Alloy

2011 ◽  
Vol 284-286 ◽  
pp. 1588-1593 ◽  
Author(s):  
Jun Du ◽  
Ming Hua Wang ◽  
Ting Fan ◽  
Wen Fang Li
Keyword(s):  
Grain Refinement ◽  
Phase Structure ◽  
Al Alloy ◽  
Obvious Effect ◽  
Grain Coarsening ◽  
Refining Efficiency ◽  
Intermetallic Particles ◽  
Carbon Inoculation ◽  
Fe Addition

The Mg-3% Al melt was treated by carbon inoculation and Fe addition. The influence of Fe on the formation of nucleation was investigated. That Fe inhibited the grain refinement of the carbon-inoculated Mg-3%Al alloy or not was closely associated with the operating sequence of carbon inoculation and Fe addition. Under the condition of Fe addition firstly and then carbon inoculation, the Al4C3particles and the particles with duplex phase structure of Al4C3coated on Al-C-Fe or Al-Fe could be observed. Both kinds of particles should act as nucleating substrates for a-Mg grains, resulting in no obvious effect of Fe on refining efficiency of carbon inoculation. Under the contrary condition, the potency of Al4C3nucleating substrates was poisoned by transforming Al4C3into Al-C-Fe-rich intermetallic particles, resulting in grain-coarsening.

The mechanism of grain refinement and plasticity enhancement by an improved thermomechanical treatment of 7055 Al alloy

2017 ◽  
Vol 702 ◽  
pp. 42-52 ◽  
Author(s):  
Jinrong Zuo ◽  
Longgang Hou ◽  
Jintao Shi ◽  
Hua Cui ◽  
Linzhong Zhuang ◽  
...  
Keyword(s):  
Grain Refinement ◽  
Thermomechanical Treatment ◽  
Al Alloy

Influence of ECAP Routes on the Microstructure and Mechanical Properties of Hot Extruded 3003 Al Alloy

2007 ◽  
Vol 124-126 ◽  
pp. 1397-1400 ◽  
Author(s):  
Byoung Soo Lee ◽  
Hoon Cho
Keyword(s):  
Mechanical Properties ◽  
Grain Refinement ◽  
Hot Extrusion ◽  
High Strength ◽  
Al Alloy ◽  
Deformation Structure ◽  
Ecap Processing ◽  
Fine Grained ◽  
Strain Process ◽  
Equiaxed Grains

The microstructures and mechanical properties of unidirectional deformation structured Al alloy during ECAP with various deformation routes were investigated. In order to fabricate unidirectional deformation structure for Al alloy, hot extrusion was carried out. It was found that the deformation route A in ECAP routes is the dominant route for the grain refinement and strengthening. In deformation route A, the high strength ultra-fine grained Al alloy with a grain size of ~ 200 nm was obtained due to the accumulation of consecutive strain process. In contrast, the strength of ECAP’ed Al alloy produced via deformation route C was greatly increased after one pass because the grains were strained and cancelled each pass. By contrast, the equiaxed grains were obtained in deformation route BC because the sample was rotated 90 O in the same sense in each pass. The deformation route BC was superior to the deformation route C because the deformation route BC was more favorable than the deformation route C in the accumulation of consecutive strain. It is also found that unidirectional deformation structured Al alloy via hot extrusion shows similar grain refinement tendency with equiaxed structured Al alloy during ECAP processing.

Significance of High Rate Superplasticity in Metallic Materials

1990 ◽  
Vol 196 ◽  
Author(s):  
Norio Furushiro ◽  
Shigenori Hori
Keyword(s):  
Grain Size ◽  
High Strain Rate ◽  
Strain Rate ◽  
Grain Refinement ◽  
Fine Particles ◽  
High Strain ◽  
High Rate ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
Al Alloy

ABSTRACTIt has been expected that “High rate superplastic materials” will be developed for industrial applications. The Dorntype equation for high temperature deformation suggests that strain rate can be increased if the grain size is decreased. This means that grain refinement can effectively establish high strain rate superplastic materials.It is well known that a high degree of grain size refinement will result from the addition of zirconium to Al-base alloys. Powder-metallurgical processing with rapidly solidified powders is also available for the improvement of superplasticity by both the refinement of the solidified structure and the maintenance of the stable fine structure of a 7475 Al alloy during recrystallization and deformation. Therefore. P/M 7475 Al alloys containing Zr up to 0.9 wt% were selected as candidate specimens. The objective of the present paper includes the clarification of the role and the effective amount of Zr to obtain high strain rate superplastic materials. As a result, the addition of 0.3%Zr or more is effective in grain refinement of the P/M 7475 Al alloy. However, alloys containing 0.7 and 0.9 wt%Zr only show superplasticity at 793K. The optimum strain rate is shifted to a higher range with increasing Zr. The alloy of 7475 Al-0.9%Zr shows the maximum elongation of 900% at the remarkably high strain rate of 3.3×10−1 s−1.The deformation mechanism of such high stain rate superplasticity will be discussed briefly, by considering the effect of the fine particles of Zr on superplastic behavior.

Application of High-Pressure Sliding for Grain Refinement of Al and Mg Alloys

2010 ◽  
Vol 667-669 ◽  
pp. 91-96 ◽  
Author(s):  
Kiyonari Tazoe ◽  
Shuji Honda ◽  
Z. Horita
Keyword(s):  
High Pressure ◽  
Strain Rate ◽  
Grain Refinement ◽  
High Pressure Torsion ◽  
Initial Strain Rate ◽  
Mg Alloys ◽  
Initial Strain ◽  
Mg Alloy ◽  
Al Alloy ◽  
Average Grain Size

An earlier study showed that high-pressure sliding (HPS) is effective for grain refinement of pure Al in a rectangular sheet form using the principle of high-pressure torsion. In this study, the HPS is applied for grain refinement of an Al-3%Mg-0.2%Sc alloy and an AZ61 Mg alloy. HPS was conducted under a pressure of 1 GPa with sliding distances of 10 to 30 mm at room temperature for the Al alloy and at 473 K for the Mg alloy The average grain size is ~300 nm for both the Al and Mg alloys, respectively. Tensile tests showed that a superplastic elongation of ~1500% is achieved in the Al-3%Mg-0.2%Sc alloy at 573 K with an initial strain rate of 3.3x10-3 s-1 and of ~600% in the AZ61 alloy at 573 K with an initial strain rate of 1x10-3 s-1.

scholarly journals Experimental Research on Micro Structure And Mechanical Properties of Al Alloy Utilizing Sustainable Biomass As Quenching Medium

2019 ◽  
Vol 8 (11) ◽  
pp. 3695-3699
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Yield Strength ◽  
Grain Refinement ◽  
Experimental Research ◽  
Al Alloy ◽  
Maximum Hardness ◽  
Micro Structure ◽  
Quenching Media ◽  
Cow Urine

Quenching media, time, temperature are prime factors towards the enhancement of grain refinement structure and mechanical properties in metals. The present study reports the usage of novel quenching media that is cow urine to improve the mechanical properties that is tensile strength, yield strength and hardness of Al 2585 alloy. The ingredients such as (sodium, nitrogen, sulphur, Vitamin A, B, C, D, E, minerals, manganese, iron, silicon, chlorine, magnesium etc.,) present in cow urine are homogenously which help to improve micro structure and mechanical properties of Al alloy 2585. From the study, it is revealed that maximum tensile strength and yield strength is improved and grain refinement is exhibited at 50% blend. Likewise maximum hardness at 80% blends.

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