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DAMPING CAPACITY OF HIGH SILICON ALLOY ZA27 PREPARED BY SPRM DEPOSITION

L.S. Yang , Y.C Liu , G.C Yang and Y.H Zhou(State Key Lab. of Solidification Processing , Northwestern Polytechnical University Xi'an 710072 , China)

金属学报(英文版)

The damping capacities (Q-1) of high silicon (6wt%) Zinc-27wt% Aluminia alloy prepared by spray deposition and conventional casting process were investigated. Three methods, free-decay, half-power band width and phase angles difference, have been ased to measure the damping capacities of the experimental materiale. The experimental results indicate that the damping capacity of spray deposited material is 3.7times larger than that of the conventional casting alloy ZA27 The machanism for its improvement was aiso investigated from a microstructvre viempoint.

关键词: high damping alloy , null , null , null

Constrained Crystal Growth Behaviour under Unidirectional Melt Flow

Shan LIU and Yaohe ZHOU (National Laboratory of Solidification Processing , Northwestern Polytechnical University Xi'an 710072 , China)(To whom correspondence should be addressed)

材料科学技术（英文）

Melt flow has an important influence on the microstructure formation of alloys. In this paper the growth behaviour of constrained crystals is systematically studied. It is discovered that the constrained crystals have a quite complicated response to melt flow. It may grow upstream or downstream or keep its growth direction unchanged with the influence of melt flow. Also low growth velocity and high flow velocity favour the formation of spike-like crystal. A new model is suggested to explain these experimental results

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