Evolution of surface roughness of a cast Al-Si-Cu piston alloy during thermal exposure

Autor: Hai-ying Li, Tong Bao, Jiaqi Zheng, Jian-ping Li, Lei Liu, Yong-chun Guo, Yang Wei, Jian-li Wang, Zhong Yang, Bo-yan Li
Rok vydání: 2020
Předmět:
Zdroj: Journal of Central South University. 27:1645-1653
ISSN: 2227-5223
2095-2899
DOI: 10.1007/s11771-020-4396-9
Popis: In the present work, samples of Al-Si-Cu piston alloy after T6 heat treatment were exposed for 2 h at temperatures ranging from 400 to 550 °C. The evolution of surface roughness and microstructure of the alloy during thermal exposure was studied by combination methods of roughness profiles, optical and scanning electron microscopy as well as XRD analysis. It is found that the roughness and mass of the alloy increase with the raise of the thermal exposure temperature, and the increasing rates of them are slow as the exposure temperature is below 500 °C, but accelerates abruptly when the temperature is higher than 500 °C. The variation of surface roughness of the alloy is closely related to phase transformation and oxidation during the thermal exposure.
Databáze: OpenAIRE
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