合金元素对铝熔体在铜基体上瞬态界面换热的影响

In this paper, a melting droplet experiment is designed to analyze the interfacial heat transfer during metal contact with substrate. T-type thermocouple is adopted and integrated with substrate to improve resolution. Heat transfer coefficient development in 20ms after melt drop is studied, melt materials include Al-Cu, Al-Si, Al-Mg and Al-Zn alloy. At least three experiments is conducted each group to improve reliability. Results show that maximum heat transfer coefficient is acquired instantaneously after melt contacts substrate, and then decreases gradually. Al-30wt.%Cu has relatively higher instantaneous heat transfer coefficient compared with other materials studied.