ISSN:
1662-9779
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Physics
Notes:
The Ni64Cu9Fe8P19 alloy was prepared using 99.95 wt % Ni, 99.95 wt % Cu, 99.95 wt %Fe and Ni-P master alloy. The melt spun ribbon in as-cast state was characterized using oftransmission electron microscope (TEM) and X-ray diffraction (XRD). The amorphous alloy wassubjected to DTA and resistivity measurement in order to determine the thermal stability at elevatedtemperatures. The melt spun ribbon had a negative TCR=-2.23·10-6K-1 that is stable up to theTg-dep=511K. At higher temperature Tg-int=560K the relative resistance starts to decrease andbetween 573K and 591K the rate of the decrease reaches TRC=-480.096 K-1. After the heatingcycle to 633K, during cooling the alloy has a positive TRC=6.03·105 K-1. DTA curve presents thethree exothermal stages with the onsets and peak values at I: Tx1=564K and T1=611K, II: Tx2=655Kand T2=662K, III: Tx3=697K and T3=715K, respectively. The melting stage can be characterized byendothermic peak with Tm=1149K and Tl=1174K. On the base of the measurements the amorphousalloy was heated to the temperatures where subsequent transformations occurred. TEM studydelivered information about formation of the M3P type tetragonal phosphide (a=9.040Å, c=4.462Å)nanocrystals within the amorphous matrix after the first stage of crystallization
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.130.167.pdf
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