Laser resolidification of the AlAl2Cu eutectic: The coupled zone

Gill, Shubhra; Zimmermann, Martin; Kurz, W.

doi:10.1016/0956-7151(92)90454-m

Cited by 86 publications

(26 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…With the data of average lamellar spacing, eutectic growth models can be verified, and crystal growth velocities can be deduced. [1][2][3][4] If solidification of eutectic alloys takes place in undercooled melts, however, the heat of fusion is conducted into the liquid. As the temperature gradient in the liquid is negative, the solidifying front is unstable and develops into dendritic morphology.…”

Section: Introductionmentioning

confidence: 99%

Structural Evidence for the Transition from Coupled to Decoupled Growth in the Solidification of Undercooled Ni-Sn Eutectic Melt

Jie

Zhao

et al. 2007

Metall Mater Trans A

View full text Add to dashboard Cite

Sn eutectic melt was undercooled and spontaneously solidified in the encasement of a glass flux. Structure morphologies of the sample surface as well as inside the sample were systematically examined, and a critical undercooling of 130 K was clearly revealed for the alloy. Below the critical undercooling, coupled lamellar eutectics (a-Ni and b-Ni 3 Sn) dendritically grow in the undercooled melt. Beyond the critical undercooling, a-Ni dendrites first form during the early recalescence. b-Ni 3 Sn nucleates uniformly in the remaining liquid and then separately grows with a-Ni. Solidification of the remaining liquid into lamellar eutectics only occurs at the places in the sample surface layer where the space between the a-Ni dendrite arms is large enough. The finding that all the solidification structures at undercooling above 20 K comprise anomalous eutectics indicates that both coupled eutectic growth and decoupled dendritic growth in the rapid solidification can result in the anomalous eutectic formation. The results also indicate that it is feasible to measure the crystal growth velocity by observation of the recalescence front when undercooling exceeds 50 K for this alloy.

show abstract

Section: Introductionmentioning

confidence: 99%

Structural Evidence for the Transition from Coupled to Decoupled Growth in the Solidification of Undercooled Ni-Sn Eutectic Melt

Jie

Zhao

et al. 2007

Metall Mater Trans A

View full text Add to dashboard Cite

show abstract

“…Contrary to the arc-melted ingot, the eutectic structure is not the predominant microstructure. While the region of eutectic formation is expanded at high undercoolings, 14,15 the underlying metastable phase relationships may result in the skewing of the eutectic-forming region and dendritic solidification at eutectic compositions. Apparently, that is the case here, and the composition ͑Sm 0.09 Co 0.91 ͒ 97 V 3 that produced a eutectic structure under conventional solidification results in primary SmCo 7 formation at higher undercoolings.…”

Section: Resultsmentioning

confidence: 99%

Rapidly solidified Sm–Co–V nanocomposite permanent magnets

Valiveti

Ingmire

Shield

2009

Journal of Applied Physics

View full text Add to dashboard Cite

Alloys around the Sm-Co eutectic composition provide an opportunity to form two-phase nanocomposite permanent magnets consisting of nanoscale Co fibers embedded in Sm 2 Co 17 .While ternary alloying elements may refine the scale of the structure, they may also disrupt the eutectic growth and lead to the formation of primary Co. Thus, microstructural selection maps were constructed for conventionally solidified Sm-Co-V alloys. It was found that V additions enlarged the primary Sm 2 Co 17-forming region and, at ͑Sm 0.09 Co 0.91 ͒ 97 V 3 , resulted in a eutectic structure. Upon rapid solidification, this alloy was determined to have a coercivity of 5 kOe with a high remanent ratio. However, the V addition reduced the magnetization, which limited the energy product to 4.3 MG Oe. The rapidly solidified structure consisted of primary SmCo 7 dendrites along with an intergranular Co region, suggesting that eutectic structure formation is skewed by underlying metastable phase relationships.

show abstract

“…ALTHOUGH research on rapid solidification of dilute alloys is well known in the literature, [1][2][3][4][5][6][7][8][9][10] the study of microstructural evolution during rapid resolidification of concentrated alloys is scarce and has been less understood in terms of experiments as well as theory. [2][3][4] The phase selection and development of the morphology of the advancing solid-liquid interface of concentrated alloy systems is a field that remains to be explored.…”

Section: Introductionmentioning

confidence: 99%