標題: Investigations on the material property changes of ultrasonic-vibration assisted aluminum alloy upsetting
作者: Hung, Jung-Chung
Lin, Chih-Chia
機械工程學系
Department of Mechanical Engineering
關鍵字: Aluminum alloy;Compression test;Ultrasonic vibration;Mechanism
公開日期: 1-三月-2013
摘要: Numerous studies have shown the benefit of ultrasonic-vibration assisted metal forming. This benefit include a reduction in forming forces, which might be attributed to the superposition of stress, increased temperatures, the effects of interface friction, and energy absorption of dislocation. This study conducts a series of experiments and analyses to investigate the main mechanisms of a reduction in forming forces during ultrasonic-vibration assisted A6061-T6 aluminum alloy upsetting. The findings of this research confirm that, under frictionless conditions, ultrasonic vibration still reduced forming forces, and ultrasonic vibration can increase the temperature of specimens and soften specimen surface during upsetting. From metallographic analyses and micro-hardness tests, the results reveal that energy absorption of dislocation was occurred during upsetting, which also contribute to the reduction of forming force. This research concludes that the mechanisms of increased temperatures and energy absorption of dislocation can affect the material property and make a reduction in forming forces; however, the interface friction effect has nothing to do with a reduction in forming forces. (C) 2012 Published by Elsevier Ltd.
URI: http://dx.doi.org/10.1016/j.matdes.2012.07.021
http://hdl.handle.net/11536/20773
ISSN: 0261-3069
DOI: 10.1016/j.matdes.2012.07.021
期刊: MATERIALS & DESIGN
Volume: 45
Issue: 
起始頁: 412
結束頁: 420
顯示於類別:期刊論文


文件中的檔案:

  1. 000312856800053.pdf