&lt;I&gt;In-situ&lt;/I&gt; Observations of Fracture Processes in 0.6 &amp;mu;m and 9.5 &amp;mu;m SiC&lt;SUB&gt;P&lt;/SUB&gt;/6061Al Composites

Qian, Lihe; Toda, Hiroyuki; Morita, Shigeki; Kobayashi, Toshirô; Wang, Zhong Guang

doi:10.2320/matertrans.46.34

Cited by 9 publications

(8 citation statements)

References 21 publications

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“…The melting point of zirconium, about 1852 8C, is obviously higher than matrix magnesium-lithium alloy. It will exist as the form of soluble zirconium and undissolved zirconium particles after adding zirconium to magnesium-lithium-zinc alloy melt [23]. While undissolved zirconium particles, due to its high density, will settle for some distances rapidly.…”

Section: Discussionmentioning

confidence: 99%

A new approach to improving the macrosegregation in zirconium‐containing magnesium‐lithium alloy

Wang

Guan

et al. 2018

Materialwissenschaft Werkst

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In the preparation process of zirconium‐containing magnesium alloy, although zirconium is introduced into alloy by magnesium‐zirconium master alloy, the settling of zirconium particles has always been a key problem. In this study, the magnesium‐30wt.%zirconium master alloy was added into magnesium‐14wt.%lithium‐zinc alloy melt in the form of the block (about 20 mm) and the particles (about 20 μm), respectively, and then magnesium‐14wt.%lithium‐zinc with 0.5 wt.% zirconium alloy were prepared using stir‐casting process. Macrosegregation of major element (zirconium), microstructure and microhardness at different casting positions were examined to investigate the effect of zirconium addition methods on macrosegregation of magnesium‐14wt.%lithium‐zinc alloy. The results show that, for the block magnesium‐zirconium master alloy addition, there is obvious macrosegregation in alloy ingots, the zirconium contents at the top position of ingot are higher than that at the bottom by nearly 200 %. The method of particles master alloy addition can effectively improve macrosegregation, the difference in zirconium contents between the top and bottom is less than 16 %.

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Section: Discussionmentioning

confidence: 99%

A new approach to improving the macrosegregation in zirconium‐containing magnesium‐lithium alloy

Wang

Guan

et al. 2018

Materialwissenschaft Werkst

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“…C and SiC were used as powder (fraction F800 with d 50 ¼ 8 mm and F500 with d 50 ¼ 14 mm), AlTi5B1 and AlSr10 as pre-alloys. Based on the references, [11][12][13][14][15][16][17] where the effect of different refiners value on the grain size was studied, optimum values for different refiners had been found as shown in Table 1 and were taken for our investigation. For homogenizing of the particles in the melt a stirring device was used.…”

Section: Experimental Investigationmentioning

confidence: 99%

“…Magnesium alloys containing aluminum show good refining effects by the seeding with carbon, creating heterogeneous Al 4 C 3 . [11,12] Alloys of Al-Ti-B are grain-refining, too. Here, TiB 2 is said to be the responsible phase for heterogeneous nucleation.…”

Section: Introductionmentioning

confidence: 99%

Effect of Grain Refiners and Casting Thickness on the Microstructure Development and Mechanical Properties of DSC‐Cast AZ31B Magnesium Strips**

Palkowski

Akdesir

2013

Adv Eng Mater

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This study aims at enhancing subsequent hot rolling properties of AZ31B by reducing the grain size using grain refinement agents (C, SiC, AlSr10, and AlTi5B1) as well as different cast thicknesses. The AZ31B magnesium alloy samples were cast in a direct strip casting process (DSC). The microstructure investigations such as the grain size measurement and the distribution of the secondary precipitates were characterized using light optical microscope (LOM) and scanning electron microscope (SEM). Furthermore, the mechanical properties were determined using tensile and Vickers hardness test. Adding a certain amount of each refiner to an AZ31B alloy leads to a significant reduction of the grain size in the cast structure. As a result of the higher cooling rate at the bottom side the grain size is reduced in comparison to the upper side (convection heat transfer with the protecting gas) across the strip thickness. The minimal grain size was found when using AlTi5B1 master alloy where the grain size is (67 AE 5) mm at the bottom side, whereas it reaches (110 AE 10) mm upside of the strip. At the bottom side and center of the strip can be observed a homogeneous precipitates distribution and similar precipitation rate, size, and distribution in comparison to the upperside. Using SiC powder and AlTi5B1 master alloy refining agents the maximal hardness values compared to the other types of agents were reached. The hardness profile confirms the grain size results considering the temperature gradient across the cast thickness. However, optimum tensile properties were found between bottom side and middle layer.

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“…Results and Discussion 3.1 Effect of lanthanum and zirconium on solidification structure 3.1.1 Addition of lanthanum to magnesium Figure 1 shows the macrostructure of an Mg2.1La alloy cast in a steel mold. Considering the cast structure of pure magnesium is essentially composed of columnar grains, 16,17) lanthanum exerted some degree of grain refinement effect to magnesium casting. The macrostructure is entirely composed of equiaxed grains with an average grain size of 489 µm and the grain size further decreased to 425 µm at 3.3%La and 345 µm at 5.9%La.…”

Section: Methodsmentioning

confidence: 99%

Role of Lanthanum in Grain Refinement and Tensile Properties of Cast Mg–La–Zr Alloys

et al. 2013

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In a previous investigation, a combined addition of zirconium and lanthanum was found to confer more marked grain refining than zirconium alone. The present experimental study confirmed this result. However, in this study, the microstructure was examined with more attention to the form of the zirconium-rich coring in the grain refined structures. It was concluded that although the average apparent grain size decreases with an addition of lanthanum, this is in part because grain growth takes place in the MgZr alloy, while the suppression of grain growth occurs with an addition of lanthanum as small as 0.5%.

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<I>In-situ</I> Observations of Fracture Processes in 0.6 μm and 9.5 μm SiC<SUB>P</SUB>/6061Al Composites

Cited by 9 publications

References 21 publications

A new approach to improving the macrosegregation in zirconium‐containing magnesium‐lithium alloy

A new approach to improving the macrosegregation in zirconium‐containing magnesium‐lithium alloy

Effect of Grain Refiners and Casting Thickness on the Microstructure Development and Mechanical Properties of DSC‐Cast AZ31B Magnesium Strips**

Role of Lanthanum in Grain Refinement and Tensile Properties of Cast Mg–La–Zr Alloys

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<I>In-situ</I> Observations of Fracture Processes in 0.6 &mu;m and 9.5 &mu;m SiC<SUB>P</SUB>/6061Al Composites

Cited by 9 publications

References 21 publications

A new approach to improving the macrosegregation in zirconium‐containing magnesium‐lithium alloy

A new approach to improving the macrosegregation in zirconium‐containing magnesium‐lithium alloy

Effect of Grain Refiners and Casting Thickness on the Microstructure Development and Mechanical Properties of DSC‐Cast AZ31B Magnesium Strips**

Role of Lanthanum in Grain Refinement and Tensile Properties of Cast Mg&ndash;La&ndash;Zr Alloys

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<I>In-situ</I> Observations of Fracture Processes in 0.6 μm and 9.5 μm SiC<SUB>P</SUB>/6061Al Composites

Role of Lanthanum in Grain Refinement and Tensile Properties of Cast Mg–La–Zr Alloys