Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 2    No. 2    May 1992

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MORPHOLOGY AND STRUCTURE OF TRANSFORMATION PRODUCTS FORMED AT INTERMEDIATE TEMPERATURE IN A Cu-Zn-A1 ALLOY"
Lu  Wei ,Jiang  Bohong, Xu Zuyao

Shanghai Jiao Tong University, Shanghai 200030, China

Abstract:A TTT diagram for the precipitation formed at some intermediate temperatures through cooling from high temperature parent phase in a Cu-27.27Zn-3.73A1  alloy is established  by means of dilatometric measurement. The morphology and structure of transformation products formed at some intermediate temperatures isothermally through cooling from high temperature parent phase and up-quenching from DO3 parent phase are studied by metallographic, X-ray and electron microscopy analyses. Three regions in the two separate C curves are obtained according to different morphology of precipitate: rod-like α, plate-like bainite and α rods, and bainite plates. Prolonged aging makes bainite plate change gradually into αwhose lattice parameters are no different from that of αformed equilibriumly from parent phase. The structure is almost orthorhombic long period structure for bainites formed from B2 and DO3 parent phase, but monoclinic for martensite from DO3. They correspond to the overlapping and separating of (1 2 10) and (2 0 10) diffraction peaks respectively, showing the lower degree of ordering in bainite

 

Key words: Cu-Zn-A1 alloy   transformation at intermediate temperature   morphology and structure

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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