Phase Evolution and Thermal Stability of Mechanically Alloyed AlCrFeCoNiZn High-Entropy Alloy

被引：26

作者：

Shivam, Vikas ^{[1
]}

Sanjana, Vadapalli ^{[1
]}

Mukhopadhyay, N. K. ^{[1
]}

机构：

[1] Indian Inst Technol BHU, Dept Met Engn, Varanasi 221005, Uttar Pradesh, India

来源：

TRANSACTIONS OF THE INDIAN INSTITUTE OF METALS | 2020年 / 73卷 / 03期

关键词：

Mechanical alloying (MA); High-entropy alloy; In situ X-ray diffraction; Thermal stability; SOLID-SOLUTION PHASE; SINGLE-PHASE; BEHAVIOR; MICROSTRUCTURE; INTERMETALLICS; ELEMENTS;

D O I：

10.1007/s12666-020-01892-1

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

In the present investigation, a newly designed composition of equiatomic AlCrFeCoNiZn high-entropy alloy (HEA) has been synthesized by mechanical alloying. The milled powder after 30 h exhibited the formation of a single solid solution phase of BCC crystal structure with lattice parameter, a = 2.87 +/- 0.02 angstrom. Decomposition of the single-phase BCC structure into the two-phase, tetragonal (Cr-Co)-based sigma phase (a = 8.81 angstrom, c = 4.56 angstrom)- and L1(2) (a = 3.59 +/- 0.02 angstrom)-type intermetallics was observed at temperature of similar to 800 degrees C (1073 K). However, after heat treatment of the 30 h milled powder at the temperatures of 300 degrees C (573 K) and 600 degrees C (873 K), similar type of phases was also noticed to coexist along with B2 (a = 2.87 +/- 0.03 angstrom)-type phase. This behaviour of the alloy confirms the diffusive nature of the phase transformation. The consolidated bulk alloy exhibited similar type of phases after sintering at 950 degrees C (1223 K).

引用

页码：821 / 830

页数：10

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