Two types of checkerboard-like microstructures in Au-Cu-Pd ternary alloys

被引：0
|
作者：
Winn, H. [1 ]
Tanaka, Y. [1 ]
Shiraishi, T. [1 ]
Udoh, K. [2 ]
Miura, E. [1 ]
Hernandez, R.I. [1 ]
Takuma, Y. [1 ]
Hisatsune, K. [1 ]
机构：
[1] Dept. of Dental Materials Science, Nagasaki Univ. Sch. Dent., 852-8588, Nagasaki, Japan
[2] Dept. of Dent. Materials Engineering, Fac. Dent., Kyushu Univ., 812-8582, Fukuoka, Japan
来源：
| 1600年 / Elsevier Sequoia SA, Lausanne, Switzerland卷 / 306期
关键词：
Age hardening - Composition - Crystal structure - Electron diffraction - Hardness testing - Metallographic microstructure - Phase transitions - Ternary systems - Transmission electron microscopy;
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摘要：
The phase transformation process in Au-Cu-Pd ternary alloys with the compositions within or near the two-phase region (Au3Cu+AuCu I) was studied by means of transmission electron microscopy and hardness testing. Two types of characteristic checkerboard-like microstructures were observed: (1) the coexistence of the Au3Cu and AuCu I ordered phases, and (2) the coexistence of the AuCu I ordered phase and disordered phase with face-centered cubic structure. Different age-hardening behaviors were recognized: The high hardness value in the former was maintained for prolonged aging periods, and that produced in the latter was maintained to a certain period followed by over-aging.
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