Analysis of the Effect of Hydrostatic Pressure on the Nonvariant Eutectic Transformation in Al-Si, Al-Cu, and Al-Cu-Si Systems

被引：3

作者：

Akopyan, T. K. ^{[1
,2
]}

Belov, N. A. ^{[2
]}

Padalko, A. G. ^{[1
]}

Letyagin, N., V ^{[2
]}

Avksent'yeva, N. N. ^{[2
]}

机构：

[1] Russian Acad Sci, Baikov Inst Met & Mat Sci, Moscow 119334, Russia

[2] Natl Univ Sci & Technol MISiS, Moscow 119049, Russia

来源：

PHYSICS OF METALS AND METALLOGRAPHY | 2019年 / 120卷 / 06期

关键词：

aluminum alloys; barothermal analysis; differential thermal analysis; thermodynamic calculations; eutectic; hot isostatic pressing; HEAT-TREATMENT; PHASE; CAST;

D O I：

10.1134/S0031918X19060024

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

Differential barothermal analysis (DBA) is used to analyze the effect of hydrostatic pressure of 100MPa on characteristic temperatures of a number of eutectic alloys (wt %), such as Al-10Si, Al-12Si, Al22Cu, Al-33Cu, and Al-7Cu-7Si. According to DBA data, the increase in pressure resulted in an increase in the temperatures of phase transformation; in practice, the most important of them is the nonvariant eutectic transformation temperature that determines the solidus of alloys. It was found that, for the binary systems, the temperatures of the nonvariant eutectic transformation L (Al) + Si and L (Al) + Al2Cu increase by 6 and 11 degrees C (from 577 to 583 degrees C and from 548 to 559 degrees C, respectively); for the ternary system, the temperature of transformation L (Al) +Al2Cu + Si increases by 6 degrees C (from 520 to 526 degrees C). Theoretical analysis, performed using thermodynamic models and Thermo-Calc software, shows that the increase in the eutectic transformation temperature with increasing pressure is directly dependent on the relative decrease in the molar volume of system upon associated eutectic transformation. In this case, the excess dissolution of silicon in (Al) under high pressure can lead to an additional decrease in the molar volume of the system, whereas the increase in the copper solubility is thermodynamically unfavorable.

引用

页码：593 / 599

页数：7

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