Grain Refinement of Magnesium Casting Alloys by Boron Addition

Nishino, Naohisa; Kawahara, Hiroshi; Shimizu, Yoshiaki; Iwahori, Hiroaki

doi:10.1002/3527607552.ch10

Cited by 17 publications

(9 citation statements)

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“…Previous studies have reported that manganese plays an important role in dispersing the Al-B compounds which could act as potential nucleating sites [8]. But results in this study appeared to the contrary as despite 0.19wt% Mn content in the magnesium alloy there was little effect on grain refinement except at very high concentrations of Al content when a completely new alloy is formed and the base alloy is no more AZ91D.…”

Section: Boron Incontrasting

confidence: 80%

“…Numerous potential additions based on carbon, calcium, boron and strontium have been examined by researchers for grain refinement on AZ91 alloy [2,3,4,5,6,7]. Carbon based additions have shown significant refinement but it causes environmental pollution while boron addition is maintained longer and is considered more feasible [8]. The effect of aluminium content on microstructure of Mg-Al alloys has been studied by Dargusch et al [9] and the effect of boron addition on grain refinement of AZ91 alloy has been studied by Suresh et al [5].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Al Addition on Microstructure of AZ91D

Joshi¹,

Babu²

2014

Magnesium Technology 2014

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Casting is a net shape or near net shape forming process so workhardening will not be applicable for improving properties of magnesium cast alloys. Grain refinement, solid-solution strengthening, precipitation hardening and specially designed heat treatment are the techniques used to enhance the properties of these alloys. This research focusses on grain refinement of magnesium alloy AZ91D, which is a widely used commercial cast alloy. Recently, Al-B based master alloys have shown potential in grain refining AZ91D. A comparative study of the grain refinement of AZ91D by addition of 0.02wt%B, 0.04wt%B, 0.1wt%B, 0.5wt%B and 1.0wt%B of Al-5B master alloy and equivalent amount of solute element aluminium is described in this paper. Hardness profile of AZ91D alloyed with boron and aluminium is compared.

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Section: Boron Incontrasting

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Effect of Al Addition on Microstructure of AZ91D

Joshi¹,

Babu²

2014

Magnesium Technology 2014

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“…However, adding carbon-containing agents such as C 2 Cl 6 or CCl 4 [14] causes environmental concerns due to chlorine emission. Also, C 2 Cl 6 is not very effective in heavy sections.…”

Section: Introductionmentioning

confidence: 99%

“…Many grain-refining methods have been developed for MgAl alloy systems, such as superheating, agitation, [7] the additions of particles such as Al 4 C 3 , [8] AlN, [9] SiC, [10] TiC, [11] and CaC 2 [12] and solute elements such as Sr, [13] B, [14] Ce, [15] and C. [16] Among these techniques, adding carbon-containing agents to the melt offers more practical advantages. However, adding carbon-containing agents such as C 2 Cl 6 or CCl 4 [14] causes environmental concerns due to chlorine emission.…”

Section: Introductionmentioning

confidence: 99%

Effect of strontium on the microstructure, mechanical properties, and fracture behavior of AZ31 magnesium alloy

Zeng

Wang

Ding

et al. 2006

Metall Mater Trans A

116

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The effect of strontium (Sr) on the microstructure, mechanical properties, and fracture behavior of AZ31 magnesium alloy and its sensitivity to cooling rate are investigated. Three phases-blocky-shaped Mg 17 Al 12 , acicular Mg 20 Al 20 Mn 5 Sr, and insular Mg 16 (Al,Zn) 2 Sr-are identified in the Sr-containing AZ31 alloys. With increasing cooling rate, the blocky-shaped Mg 17 Al 12 phase increases, the acicular Mg 20 Al 20 Mn 5 Sr phase diminishes, and the insular Mg 16 (Al,Zn) 2 Sr phase is refined and granulated. The study suggests that the grain size decreases with increasing cooling rate for a given composition. However, the grain size decreases first, then increases, and finally decreases again with increasing Sr for a given cooling rate. The yield strength ( y ) of AZ31 magnesium alloy can be improved by grain refinement and expressed as y ϭ 35.88 ϩ 279.13d Ϫ1/2 according to the Hall-Petch relationship. The elongation increases when Sr is added up to 0.01 pct and then decreases with increasing Sr addition. Grain refinement changes the fracture behavior from quasicleavage failure for the original AZ31 alloy to mixed features of quasicleavage and microvoid coalescence fracture.

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“…Another grain refining method developed for Mg-Al based alloys is the Elfinal process [5,30], which involves the addition of anhydrous FeCl 3 to a molten magnesium alloy. Apart from the above said, other additives like Sr, RE, Th, Si, Ca, B, AlN, MgO, TiB 2 and TiC have also been tried [4,31,32]. In the following, a brief discussion on the mechanisms underlying the grain refinement of Mg-Al based alloys is made.…”

Section: Grain Refinement Of Aluminium Bearing Alloysmentioning

confidence: 99%

Grain refining mechanisms in magnesium alloys — An overview

Vinotha

Raghukandan

Pillai

et al. 2009

Trans Indian Inst Met

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The literature on mechanisms of grain refinement in magnesium alloys is reviewed with regard to two broad groups of alloys: aluminiumbearing and aluminium-free alloys. While a low level zirconium addition significantly reduces the grain size of the aluminium-free alloys, the understanding of mechanisms of grain refinement in aluminium-bearing alloys is poor and in some cases probably confusing due to the interaction between impurity elements and aluminium in affecting the potency of nucleant particles. Mechanisms of grain refinement in magnesium alloys are dealt based on the experimental results in conjunction with microstructural observations. Informations revealed by this approach identify new directions for further research to focus on obtaining an improved understanding of the detailed mechanisms of grain refinement in magnesium alloys.

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Grain Refinement of Magnesium Casting Alloys by Boron Addition

Cited by 17 publications

References 0 publications

Effect of Al Addition on Microstructure of AZ91D

Effect of Al Addition on Microstructure of AZ91D

Effect of strontium on the microstructure, mechanical properties, and fracture behavior of AZ31 magnesium alloy

Grain refining mechanisms in magnesium alloys — An overview

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