期刊
ULTRASONICS SONOCHEMISTRY
卷 40, 期 -, 页码 433-441出版社
ELSEVIER
DOI: 10.1016/j.ultsonch.2017.07.027
关键词
Magnesium alloy; Dual-frequency; Grain refinement; Mechanical properties; Ultrasonic treatment
资金
- National Key Research and Development Program of China [2016YFB0301104]
Compared with other dual-frequency acoustic applications, melt-treatment with dual-frequency ultrasound was less researched, especially in magnesium field. In this present work, traditional single-frequency ultrasonic field (SUF) treatment and dual-frequency ultrasonic field (DUF) treatment were used to refine the as-cast microstructure and improve the mechanical properties of the ZK60 (Mg-Zn-Zr) magnesium alloy. The influences of DUF on the microstructure evolution and mechanical properties were systematically investigated, and the cavitation bubble's dynamic behaviors were investigated by numerical simulation. alpha-Mg grains and second phases were dramatically refined by introduced ultrasound, and DUF showed higher refinement efficiency than SUF. The DUF treatment promoted the formation of small alpha-Mg globular grains and changed the distribution and morphology of MgZn2 phases. Mechanical properties of the as-cast alloy were much promoted with DUF. Yield strength, ultimate tensile strength and elongation increased to 153 MPa, 239 MPa and 13.9% respectively after 1400 W DUF treatment, which were 30.8%, 42.3% and 58.0% higher than the values obtained from untreated samples and 20.5%, 20.7% and 30.0% higher than 1200 W SUF treated samples. The DUF can generate more and larger cavitation bubbles, and make more bubbles into instantaneous bubbles, improving refinement efficiency.
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