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首页> 外文会议>TMS(The Minerals, Metals amp; Materials Society) Annual Meeting and Symposium on Solidification of Aluminum Alloys; 20040314-20040318; Charlotte,NC; US >SOLIDIFICATION OF ALUMINUM ALLOY A356 UNDER ULTRASONIC VIBRATION
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SOLIDIFICATION OF ALUMINUM ALLOY A356 UNDER ULTRASONIC VIBRATION

机译：超声振动下铝合金A356的凝固

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摘要

Ultrasonic vibration has been shown to be an effective way of obtaining globular grains but its influence on the nucleation and growth of the grains is unclear. In the present study, thermodynamic simulations were carried out to determine the temperature versus solid fraction curve of aluminum alloy A356. The alloy was then treated at various solid fractions isothermally using ultrasonic vibrations. Initial results indicate that it is difficult to obtain globular grains if the specimens are treated at isothermal temperatures in the mushy zone. This means that dendrite fragmentation may play a less important role in producing globular grains. Applying ultrasonic vibrations to the alloy close to its liquidus temperatures resulted in fine globular grains, if the treated specimens were cooled quickly. The experimental results suggest that nucleation plays a key role in the formation of globular grains when the specimens are under ultrasonic vibrations.
机译：超声波振动已被证明是获得球状晶粒的有效方法，但其对晶粒成核和生长的影响尚不清楚。在本研究中，进行了热力学模拟以确定铝合金A356的温度与固相分数曲线。然后，使用超声波振动等温处理各种固体成分的合金。初步结果表明，如果将样品在糊状区中等温处理，则很难获得球状颗粒。这意味着枝晶碎裂可能在产生球状颗粒中起次要作用。如果将处理过的样品快速冷却，则在接近其液相线温度的条件下对合金施加超声波振动会产生细小的球状晶粒。实验结果表明，当样品在超声振动下时，成核作用在球状颗粒的形成中起关键作用。

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