金属合金等温相变的体激活能及相变机制 II. <em>β</em>黄铜等温相变

金属学报

2009, Vol. 45

Issue (1): 32-36

论文

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金属合金等温相变的体激活能及相变机制 II. β黄铜等温相变

康沫狂¹; 张明星²; 刘峰¹; 朱明¹

1 西北工业大学材料学院; 西安 710072
2 Division of Materials; School of Engineering; University of Queensland; Brisbane; QLD 4072; Australia

OVERALL ACTIVATION ENERGY OF ISOTHERMAL TRANSFORMATION IN METAL ALLOY AND ITS MECHANISM II. Isothermal Transformation in β Brasses

KANG Mokuang¹; ZHANG Mingxing²; LIU Feng¹; ZHU Ming¹

1 School of Materials; Northwestern Polytechnical University; Xi'an 710072
2 Division of Materials; School of Engineering; University of Queensland; Brisbane; QLD 4072; Australia

引用本文:

康沫狂张明星刘峰朱明. 金属合金等温相变的体激活能及相变机制 II. β黄铜等温相变[J]. 金属学报, 2009, 45(1): 32-36.
. OVERALL ACTIVATION ENERGY OF ISOTHERMAL TRANSFORMATION IN METAL ALLOY AND ITS MECHANISM II. Isothermal Transformation in β Brasses[J]. Acta Metall Sin, 2009, 45(1): 32-36.

全文: PDF(914 KB)

摘要:

与钢相似, β黄铜等温处理获得的片状α₁(贝氏体)和棒状α都具有自己的C曲线; 各转变初期均能获单一相, 而转变中、后期通常可获相邻两相的复合体. 必须用单一相和Arrhenius关系求相变产物的体激活能. 用体激活能、相的形貌和体自由能变化相结合能可诠释下述论点: 片状α₁(贝氏体) 是溶质原子扩散控制下母相β' 中的贫溶质区, 进行“军队型”原子无扩散马氏体样切变相变; 棒状α是溶质原子扩散控制下母相β' 中的最贫溶质区, 发生“平民型”原子无扩散界面控制相变.

关键词 ：片状α₁(贝氏体), 棒状α, 体激活能, 马氏体样切变, 界面控制相变, β黄铜

Abstract：

Similarly to steels, in the isothermally treated $\beta$ brasses, the plate-like α₁ (bainite) and rod-like α have all themselves C curves. A single phase is always produced in the primary stage, whereas the nearby two-phase complex is usually produced in the medium or final stage of the transformation. Only a single phase and Arrhenius equation must be used to deduce the overall activation energy for the transformation product. By a combination of overall activation energy, morphology and change of free energy, it can be explained that the plate-like α₁ (bainite) transformation mechanism follows military atom diffusionless martensite-like shear, occurring in solute-depleted region controlled by solute atom diffusion in parent phase β', and the rod-like α phase results from civilian atom diffusionless interphase control transformation, occurring in the most solute-depleted region controlled by solute atom diffusion in parent phase β'.

Key words： plate-like α₁ (bainite), rod-like α, overall activation energy martensite-like shear interphase control transformation β brass

收稿日期: 2008-04-10

ZTFLH:

TG111.5

作者简介: 康沫狂, 男, 1920年生, 资深教授

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https://www.ams.org.cn/CN/ 或 https://www.ams.org.cn/CN/Y2009/V45/I1/32

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[1]	康沫狂张明星刘峰朱明. 金属合金等温相变的体激活能及相变机制 I. 钢的中温(贝氏体)等温相变[J]. 金属学报, 2009, 45(1): 25-31.

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