Structural Changes of α Phase in Furnace Cooled Eutectoid Zn-Al Based Alloy

材料科学技术（英文）, 2007, 23(3): 347-352.

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1.Advanced Manufacturing Technology Research Center, Department of Industrial and Systems Engineering, The Hong Kong Polytechnic University, Hong Kong, China

2.Advanced Manufacturing Technology Research Center, Department of Industrial and Systems Engineering, The Hong Kong Polytechnic University, Hong Kong, China

3.Department of Applied Physics, The Hong Kong Polytechnic University, Hong Kong, China

4.Advanced Manufacturing Technology Research Center, Department of Industrial and Systems Engineering, The Hong Kong Polytechnic University, Hong Kong, China

5.Advanced Manufacturing Technology Research Center, Department of Industrial and Systems Engineering, The Hong Kong Polytechnic University, Hong Kong, China

基金项目: The authors would express their gratitude to The Research Grants Council of Hong Kong Special Administrative Regiong of the People's Repubic of China for financial(528606)

Structural Changes of α Phase in Furnace Cooled Eutectoid Zn-Al Based Alloy

Keywords： Phase decomposition

Furnace cooling is a slow cooling process. It is of importance to study structural evolution and its effects on the properties of alloys during the furnace cooling. Decomposition of aluminium rich α phase in a furnace cooled eutectoid Zn-Al based alloy was studied by transmission electron microscopy. Two kinds of precipitates in the α phase were detected in the FCZA22 alloy during ageing at 170℃. One was the hcp transitional α"m phase which appears as directional rods and the round precipitates. The other was the fcc α'm phase.It was found that the transitional phase α'm grew in three preferential directions of <110>, <011> and <101>. The orientation relationship between the α phase and transitional phase α'm was determined as (02-2)α'm(fcc)//(02-2)α(fcc), [-111]α'm(fcc)//[-233]α(fcc). The non-equilibrium phase decomposition of the α phase is discussed in correlation with the equilibrium phase relationships.

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Structural Changes of α Phase in Furnace Cooled Eutectoid Zn-Al Based Alloy

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