Mechanisms of eutectic lamellar destabilization upon rapid solidification of an undercooled Ag-39.9 at.% Cu eutectic alloy

Dong, Hao; Chen, Y.Z.; Zhang, Z.R.; Shan, G.B.; Zhang, W.X.; Liu, F.

doi:10.1016/j.jmst.2020.05.019

Cited by 19 publications

(2 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The grains’ shape is elongated in the lamination direction of the silver plate used for coin blanks. This observed aspect is in good agreement with the data in the literature [ 25 , 26 ].…”

Section: Resultssupporting

confidence: 93%

Silver Depreciation in 3-Polker Coins Issued during 1619–1627 by Sigismund III Vasa King of Poland

Petean

Paltinean

Pripon³

et al. 2022

Materials

View full text Add to dashboard Cite

The present research is focused on the 3-Polker coins issued during 1619–1627 by Sigismund III Vasa, King of Poland. A major financial crisis took place at that time due to the 30-year War, which started in 1619. There are two theories among historians concerning the silver depreciation of these coins. The most common theory (generally accepted without proof) is that the later years of issue are depreciated below 60% Ag. The second theory is based on the medieval sources that indicate inflation during the years from 1621–1625, but the medieval source only refers to the inflation of the type of coins and does not mention the issuer. Therefore, in this study, we use modern investigation techniques and materials science methods to help historians elucidate the aforementioned aspects regarding the medieval period. The XRD investigation results are in good agreement with the SEM-EDX elemental analysis. The coins from 1619 and 1620 have high silver content, namely, 86.97% and 92.49%, which corresponds to good silver. The amount of Ag found in the coins from 1621–1625 issituated in the range of 63.2–74.6%. The silver titleis suddenly restored in 1626 at about 84.3% and is kept in a good range until the end of this decree under Sigismund III in 1627. In conclusion, the second theory was partly validated by our experimental results, certifying the currency depreciation during 1621–1625, but the silver title was not lower than 54.2%. Notably, even this depreciated silver title assures a good quality of the 3-Polker coins compared to similar coins issued in other countries that were copper–silver-plated. Therefore, the 3-Polker coins were preferably hoarded at that time.Small alterations in the mint mark’s design were observed in all the depreciated coins compared to the good ones. This might be a sign for an expert to identify the depreciated coins, a fact which requires supplementary investigations. The silver title’s restoration in 1626 also came with a complete change of the mintmark.

show abstract

Section: Resultssupporting

confidence: 93%

Silver Depreciation in 3-Polker Coins Issued during 1619–1627 by Sigismund III Vasa King of Poland

Petean

Paltinean

Pripon³

et al. 2022

Materials

View full text Add to dashboard Cite

show abstract

“…Noteworthy is that a larger Zn content increased the liquidus temperature but decreased the solidus temperature, which should be ascribed to the refined microstructure. In addition, the rapid solidification during the ultrasonic gas atomization processing would increase the solid solubility of the a-Al matrix [24,25]. The excessive Si, Cu and Zn contents in a-Al matrix would increase lattice distortions and entropy, contributing to the liquidus temperature growth.…”

Section: Thermal Properties and Wettability Of Alloy Powdermentioning

confidence: 99%

Investigation of Al-Si-Cu-Zn-Y-Base Alloy Powders Prepared by Ultrasonic Gas Atomization for Brazing of an Al-Base Alloy

Sheng

Zhao

2021

Strength Mater

View full text Add to dashboard Cite

The Al-Si-Cu-Zn-Y-base alloys with different Cu and Zn contents were prepared, and their brazing powders were fabricated by ultrasonic gas atomization. Their microstructure evolution, thermal properties, and brazing behavior were investigated, and the results demonstrated that an increase in a Cu content of the alloy promoted the eutectic structure coarsening and the bulk Si phase formation, while an increase in a Zn content could refine this structure. The alloy powders prepared by ultrasonic atomization exhibited ultrafine microstructure, which was little influenced by the alloying composition. The powders had a high weight ratio within 70-150 mm, and an increase in Cu and Zn contents would extend the tendency, especially the Cu content. Its increase raised the solidus and endothermic peak temperatures, while an increase in the Zn content brought about a decrease of those characteristics. The wettability of the alloy powder could be improved by an increase in the Cu and Zn contents. The brazing joint by the alloy powders had the highest shear strength, which could be attributed to its good wettability, relative low solidus and liquidus temperatures.

show abstract

Unraveling the Effect of Elastic Stress on the Destabilization Process of Ni–Sn Eutectic Lamellae at an Elevated Temperature

Yang,

Dong,

Wan

et al. 2024

Metall Mater Trans A

View full text Add to dashboard Cite

Mechanisms of eutectic lamellar destabilization upon rapid solidification of an undercooled Ag-39.9 at.% Cu eutectic alloy

Cited by 19 publications

References 23 publications

Silver Depreciation in 3-Polker Coins Issued during 1619–1627 by Sigismund III Vasa King of Poland

Silver Depreciation in 3-Polker Coins Issued during 1619–1627 by Sigismund III Vasa King of Poland

Investigation of Al-Si-Cu-Zn-Y-Base Alloy Powders Prepared by Ultrasonic Gas Atomization for Brazing of an Al-Base Alloy

Unraveling the Effect of Elastic Stress on the Destabilization Process of Ni–Sn Eutectic Lamellae at an Elevated Temperature

Contact Info

Product

Resources

About