Effects of high power ultrasonic vibration on the cold compaction of titanium

Abstract

Titanium has widely been used in chemical and aerospace industries. In order to overcome the drawbacks of cold compaction of titanium, the process was assisted by an ultrasonic vibration system. For this purpose, a uniaxial ultrasonic assisted cold powder compaction system was designed and fabricated. The process variables were powder size, compaction pressure and initial powder compact thickness. Density, friction force, ejection force and spring back of the fabricated samples were measured and studied. The density was observed to improve under the action of ultrasonic vibration. Fine size powders showed better results of consolidation while using ultrasonic vibration. Under the ultrasonic action, it is thought that the friction forces between the die walls and the particles and those friction forces among the powder particles are reduced. Spring back and ejection force didn't considerably change when using ultrasonic vibration.

Influence of ultrasonic vibrations on the properties of press-and-sintered titanium

“…Fartashvand et al 17 investigated the influence of ultrasonic vibration on green part density, friction stress on die wall, and removal force of part from the die and found that ultrasonic vibration has an improving role in these parameters. Abedini et al 8 investigated the contribution of pressure, temperature, and high-power ultrasonic vibration on hot pressing of titanium alloy.…”

“…First, to investigate its effect on the properties of the green sample in cold compression, which was presented in our previous study. 17 This study determined the influence of ultrasonic vibration on sintered specimens’ density, shrinkage, and compression strength. Also, the effect of compaction load, aspect ratio, and powder size on mentioned properties was investigated.…”

Plastic deformation behavior of Ti45Nb in ultrasonic vibration-assisted compression

“…The use of ultrasonic vibration in metal forming began in 1955 when Blaha and Langenecker applied ultrasonic vibration to tension tests of zinc single crystal and found that the flow stress of the material was significantly reduced [1]. Owing to the great advantages of ultrasonic vibration, many scholars have applied it in many metal forming processes and found that ultrasonic vibration can decrease stress [2][3][4], promote deformation [5][6][7][8], minish friction between workpiece and tool [9], and refine grain size [10], etc. In this paper, ultrasonic vibration-assisted compression (UAC) tests were conducted on Ti45Nb alloy, and the deformation behavior and mechanism were analyzed.…”

High power ultrasonic effect on soil compaction for different static pressure

“…Many studies have been reported that the powder compaction is improved by decreasing the friction of powder caused by ultrasonic vibration [1][2][3] . Generally, the powder compaction is performed with ultrasonic vibration as well as high static pressure.…”