Effect of tool rotating rate on foaming properties of porous aluminum fabricated by using friction stir processing

Nondestructive Observation of Pore Structures of A1050 Porous Aluminum Fabricated by Friction Stir Processing

“…In a previous study, we confirmed that there was , in the case of A1050 porous aluminum. 13) According to this result, a larger precursor can be made with a similar FSP time to that required for a smaller precursor by increasing the tool rotating rate. Precursors of FSP-L porous aluminum of 10.5 mm thickness, 25 mm width and 25 mm length were machined from the region stirred by FSP.…”

“…The holding temperature (equal to the preheated temperature) was determined by reference to our previous study 13) and was fixed at 1003 K during the heating process. The holding time for FSP-S porous aluminum was fixed at 10 min, also in accordance with our previous study, 13) whereas that for FSP-L porous aluminum was varied from 14 to 15 min. The sample was then cooled to room temperature under ambient conditions.…”

“…10) However, a quantitative evaluation of the pore structure of porous aluminum fabricated by the FSP route, which affects the properties of porous aluminum, has not been carried out in previous studies. 12,13) Also, only porous aluminum samples that were too small to be subjected to compression tests 14) were fabricated in the previous studies. 12,13) In this study, two different sizes of A1050 porous aluminum were fabricated from two different sizes (small and large) of precursor by the FSP route precursor method, which we hereafter refer to as ''FSP-S porous aluminum'' and ''FSP-L porous aluminum'', respectively.…”

“…12,13) Also, only porous aluminum samples that were too small to be subjected to compression tests 14) were fabricated in the previous studies. 12,13) In this study, two different sizes of A1050 porous aluminum were fabricated from two different sizes (small and large) of precursor by the FSP route precursor method, which we hereafter refer to as ''FSP-S porous aluminum'' and ''FSP-L porous aluminum'', respectively. The pore structures of FSP-S porous aluminum, FSP-L porous aluminum and also commercially available porous aluminum (ALPORAS, fabricated by Shinko Wire Co., Ltd., by direct foaming of melts with blowing agents 3) ) were nondestructively observed by X-ray computed tomography (X-ray CT).…”

Fabrication and Tensile Tests of Aluminum Foam Sandwich with Dense Steel Face Sheets by Friction Stir Processing Route

“…1(c) and 1(d), was applied to obtain a larger precursor and to mix the powders thoroughly. 13) As shown in Fig. 1(d), precursor samples of 35 mm © 35 mm © 4.5 mm aluminum bonded with 80 mm © 35 mm © 2 mm steel sheets were cut from the region subjected to FSP.…”