MICROSTRUCTURAL EVOLUTION OF AS-CAST ZA27 ALLOY DURING COMPRESSIVE CREEP
来源期刊：Acta Metallurgica Sinica2003年第5期
论文作者：X.W.Wei B.L.Shen
Key words：microstructure change; compressive creep; ZA27 alloy;
Abstract: Phase transformation and microstructural change of an as-cast ZA27 alloy were investigated during compressive creep by X-ray diffraction technique, SEM and TEM. Compressive creep induced decomposition of a metastable η' phase and a four-phase transformation,α+ε→T'+η and T'→θ, occurred during the compressive creep testing. The occurrence of negative creep in the alloy resulted from the volume expansion caused by the four-phase transformation. A microstructural change was also observed from a lamellar structure into a spheroidized structure in higher creep strain of tested specimens. It provided evidence of compressive creep induced phase transformation which occurred in ageing process.
X.W.Wei1，B.L.Shen1
(1.Department of Metal Science, Sichuan University, Chengdu 610065, China;
2.Department of Materials Science and Engineering, Sichuan Institute of Technology, Chengdu 610039,China)
Abstract:Phase transformation and microstructural change of an as-cast ZA27 alloy were investigated during compressive creep by X-ray diffraction technique, SEM and TEM. Compressive creep induced decomposition of a metastable η'' phase and a four-phase transformation,α+ε→T''+η and T''→θ, occurred during the compressive creep testing. The occurrence of negative creep in the alloy resulted from the volume expansion caused by the four-phase transformation. A microstructural change was also observed from a lamellar structure into a spheroidized structure in higher creep strain of tested specimens. It provided evidence of compressive creep induced phase transformation which occurred in ageing process.
Key words:microstructure change; compressive creep; ZA27 alloy;
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