Abstract
The exact eutectoid and peritectoid temperatures in near equiatomic Zr-Pd compositions have been determined by using the diffusion couple method and microstructure analysis. The crystal structure of Zr13Pd12 compound were estimated to be orthorhombic with a = 1.78 nm, b = 0.80 nm and c = 1.00 nm from the electron diffraction experiments. The Zr13Pd12 compound is formed at 1100 ± 2 K with a peritectoid reaction between Zr2Pd and ZrPd compounds. The ZrPd compound transforms to Zr13Pd12 and Zr9Pd11 compounds by a eutectoid reaction at 1028 ± 4 K. Based on these results, the phase diagram of near equiatomic Zr-Pd binary system is reconstructed.
Highlights
The interest in shape memory alloys with high transformation temperatures (HTSMAs), defined as SMAs that operate at temperature above 373 K, has significantly increased [1,2,3].Near equiatomic Zr-Pd alloys are candidates for HTSMAs because of high martensitic transformation temperature; they undergo a martensitic transformation from a cubic B2-type parent phase to an orthorhombic CrB-type martensitic phase at 813 K, and monoclinic martensitic phase at room temperature [4]
Disks with a diameter of 3 mm were spark-cut from the ingot for the transmission electron microscope (TEM) (JEOL, Tokyo, Japan) studies
The Zr13 Pd12 compound is formed at 1100 ± 2 K with a peritectoid reaction between Zr2 Pd and
Summary
The interest in shape memory alloys with high transformation temperatures (HTSMAs), defined as SMAs that operate at temperature above 373 K, has significantly increased [1,2,3].Near equiatomic Zr-Pd alloys are candidates for HTSMAs because of high martensitic transformation temperature; they undergo a martensitic transformation from a cubic B2-type parent phase to an orthorhombic CrB-type martensitic phase at 813 K, and monoclinic martensitic phase at room temperature [4]. The interest in shape memory alloys with high transformation temperatures (HTSMAs), defined as SMAs that operate at temperature above 373 K, has significantly increased [1,2,3]. In order to develop the new HTSMAs, correct information on transformation behavior and phase equilibrium is inevitably required. Phase diagrams, which are composed of lines of the equilibrium and phase boundaries, are useful for the development of new alloys for specific applications, and design and control of heat-treatment procedures to supply a desired mechanical, functional, and chemical property. The ZrPd compound transforms to Zr13 Pd12 and Zr9 Pd11 compounds by a eutectoid reaction at about 1040 K. It is found that the Zr13 Pd12 compound forms by a peritectoid reaction between Zr2 Pd and ZrPd compounds at about 1100 K.
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