Consolidation of mechanically alloyed powder mixture of Cu–Zn alloy and graphite

A powder mixture consisting of Cu–29.7at.% Zn alloy and graphite was mechanically alloyed in a planetary ball mill. The supersaturated solid solubility of carbon in the Cu–29.7at.% Zn alloy was determined to be 38.5at.% C (alloy composition: Cu–18.3at.% Zn–38.5at.% C) by the change in lattice parame...

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Bibliographic Details
Published in:	Materials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 350; no. 1; pp. 173 - 178
Main Authors:	Yamane, Toshimi, Okubo, Hirotaka, Oki, Nobuhiro, Hisayuki, Koji, Kiritani, Mitio, Komatsu, Masao
Format:	Journal Article Conference Proceeding
Language:	English
Published:	Amsterdam Elsevier B.V 15-06-2003 Elsevier
Subjects:	Applied sciences Carbon Consolidation Cu–Zn alloy Exact sciences and technology Mechanical alloying Metal powders Metals. Metallurgy Powder metallurgy. Composite materials Production techniques Solid solution Consolidation Cu–Zn alloy Solid solution Mechanical alloying Carbon Vickers hardness Ternary alloy Planetary mill Ball mill Solubility Supersaturation Experimental study Lattice parameters Compressive stress Cu-Zn alloy Carbon alloys Powder compaction Chemical composition Zinc alloy Copper alloy
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Summary:	A powder mixture consisting of Cu–29.7at.% Zn alloy and graphite was mechanically alloyed in a planetary ball mill. The supersaturated solid solubility of carbon in the Cu–29.7at.% Zn alloy was determined to be 38.5at.% C (alloy composition: Cu–18.3at.% Zn–38.5at.% C) by the change in lattice parameter of the alloy. Supersaturated Cu–24.2at.% Zn–18.5at.% C alloy powder consolidated by a static compression stress of 1.4 GPa was found to have a relative density of 89.7%, a Vickers hardness of 147.2, and a compressive strength of 1.4 GPa which is equal to the statically consolidated compression stress. Moreover, the supersaturated solid-soluble carbon did not precipitate. When dynamically consolidated by a 93 g projectile at a speed of 38.1 m s −1 (estimated impact compression stress of 2.3 GPa) after static precompression of 0.4 GPa, the alloy powder was found to have a relative density of 93%, a Vickers hardness of 177, and a compressive strength of 2.3 GPa which is equal to the impact compression stress. Supersaturated solid solubility of 18.5at.% C decreased to 15at.% C after impact consolidation. The mechanically alloyed powders can maintain supersaturated solid solubility when consolidated by impact pressure, and especially when consolidated by static pressure.
ISSN:	0921-5093 1873-4936
DOI:	10.1016/S0921-5093(02)00724-4