Enhancement of Mechanical Properties of Pure Aluminium through Contactless Melt Sonicating Treatment.

Enhancement of Mechanical Properties of Pure Aluminium through Contactless Melt Sonicating Treatment.
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通过非接触式熔体超声处理提高纯铝的力学性能

DOI:
10.3390/ma14164479
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发表时间:
2021-08-10
期刊:
Materials (Basel, Switzerland)
影响因子:
--
通讯作者:
Pericleous KA
Pericleous KA
中科院分区:
其他
文献类型:
--
作者:
Dybalska A;Caden A;Griffiths WD;Nashwan Z;Bojarevics V;Djambazov G;Tonry CEH;Pericleous KA

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先前设计了一种新的非接触式超声焊头方法,以便在液态金属内部提供空化条件。所夹带气泡的振荡及其最终的破裂会导致极端的压力变化,从而使氧化膜解聚和分散。颗粒表面的强制润湿和脱气是被认为涉及的其他机制。先前的出版物表明使用这种技术可使晶粒尺寸显著减小。在本文中,作者将这项研究扩展到强度测量,并证明了铸造质量的提高。还对脱气效应进行了解释,以说明合金强化所涉及的主要机制。在适当的地方给出了平均值和威布尔分析以完善数据。对铸造铝的测试结果表明,与未经处理的材料相比,晶粒细化最多可达48%,伸长率提高28%(未经处理的材料为16%),极限抗拉强度(UTS)提高多达17%。在促进脱气的条件下,氢含量降低了0.1立方厘米/100克。
A new contactless ultrasonic sonotrode method was previously designed to provide cavitation conditions inside liquid metal. The oscillation of entrapped gas bubbles followed by their final collapse causes extreme pressure changes leading to de-agglomeration and the dispersion of oxide films. The forced wetting of particle surfaces and degassing are other mechanisms that are considered to be involved. Previous publications showed a significant decrease in grain size using this technique. In this paper, the authors extend this research to strength measurements and demonstrate an improvement in cast quality. Degassing effects are also interpreted to illustrate the main mechanisms involved in alloy strengthening. The mean values and Weibull analysis are presented where appropriate to complete the data. The test results on cast Al demonstrated a maximum of 48% grain refinement, a 28% increase in elongation compared to 16% for untreated material and up to 17% increase in ultimate tensile strength (UTS). Under conditions promoting degassing, the hydrogen content was reduced by 0.1 cm3/100 g.
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