Effect of Cooling Rate on Morphology of TiAl3 Particles in Al–4Ti Master Alloy

Zhao, Jianhua; Wang, Tao; Chen, Jing; Fu, Lu; He, Jiansheng

doi:10.3390/ma10030238

Cited by 8 publications

(1 citation statement)

References 26 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…С позиции явления структурной наследственности интерес представляют работы китайских ученых [16][17][18][19], в которых приводятся результаты исследований по наследственному влиянию структуры лигатуры AlTiC на ее модифицирующую способность [16], влиянию скоростей охлаждения на размеры и морфологию интерметаллидов Al 3 Ti в лигатуре AlTi4 [17] и влиянию структуры лигатур AlTi4 и AlTi5 на эффективность модифицирования алюминия технической чистоты [18,19].…”

Section: Introductionunclassified

Influence of Methods for Alti Master Alloy Production on Its Structure and Efficiency in Aluminum Alloy Modification

Никитин¹,

Тимошкин²,

Никитин³

2018

Izv.VUZ. Tsvet. Met.

View full text Add to dashboard Cite

A comparative study on the effect of methods for obtaining AlTi4 modifying master alloys on the sizes of Al3Ti intermetallics is made. It is found that increasing cooling rates at solidification from 10–15 °C/s (crystallization in a hot cast iron mold, a plate 30 mm in thickness) to 60–65 °C/s (crystallization in a cold cast iron chill mold, a rod 20 mm in diameter, 170 mm in length) reduces the length and thickness of needle-shaped intermetallics almost twice (397×23 to 215×13 μm). At the same time, lower electrical conductivity and higher alloy density in a solid state are observed. Melt modification with 0,5 wt.% magnesium addition causes the formation of homogeneous 98×3 μm fine-needle intermetallics. The addition of magnesium slightly reduces electrical conductivity and density compared with the AlTi4 master alloy crystallized at the same cooling rate (60–65 °C/s). Modification of A97 grade aluminum and AK9ch alloy (Al–Si–Mg system) with the specified master alloys at the same amount of titanium added (0,01 wt.%) exerts hereditary influence on the density and electrical conductivity, and macrograin (A97) and dendrites of aluminium (AK9ch). The maximum modifying effect is provided by the AlTi4 master alloy containing 0,5 wt.% magnesium. When introduced into the alloy, it contributes to the formation of 10 μm aluminum dendrites 1427 pcs/mm2 in total in the alloy structure. When the AK9ch alloy is modified with the master alloy crystallized at cooling rates of 10–15 °C/s, 28 μm dendrites 672 pcs/mm2 in total are formed in the alloy structure. It is suggested to use density and electrical conductivity determination methods for express evaluation of master alloy modifying effectiveness.

show abstract

Section: Introductionunclassified

Influence of Methods for Alti Master Alloy Production on Its Structure and Efficiency in Aluminum Alloy Modification

Никитин¹,

Тимошкин²,

Никитин³

2018

Izv.VUZ. Tsvet. Met.

View full text Add to dashboard Cite

show abstract

In Situ Hybrid Aluminum Matrix Composites: A Review of Phase Transformations and Mechanical Aspects

Azarniya

Abdollah-zadeh

et al. 2019

Adv Eng Mater

View full text Add to dashboard Cite

The growing industrial needs for the development of strong load‐bearing materials by powder metallurgy and casting technologies has led to recent progress in the synthesis of in situ hybrid aluminium matrix composites (AMCs). Unlike their conventional counterparts, this class of engineering materials and their physicomechanical properties are sparsely investigated with no satisfactorily systematic approach and are not reviewed up to now. This is why providing an overview summarizing the formation mechanisms of in situ phases and mechanical properties of hybrid AMCs can systematically guide the research path in this field. The present review strives to categorize hybrid AMCs based on their dominant in situ formed reinforcements and draw a comparison between different fabrication methods and used starting materials. Finally, the present challenges and potential solutions are addressed both from scientific and technological aspects.

show abstract