Microstructural evolution and growth behavior of intermetallic compounds at the liquid Al/solid Fe interface by synchrotron X-ray radiography

2018 ◽  
Vol 136 ◽  
pp. 157-164 ◽  
Author(s):  
Zongye Ding ◽  
Qiaodan Hu ◽  
Wenquan Lu ◽  
Xuan Ge ◽  
Sheng Cao ◽  
...  
Keyword(s):  
Intermetallic Compounds ◽  
Microstructural Evolution ◽  
Growth Behavior ◽  
X Ray

scholarly journals Inhibiting Effects of the Ni Barrier Layer on the Growth of Porous Cu3sn in 10 μm Microbumps

2021 ◽  
Author(s):  
Siyan Liu ◽  
Chenlin Yang ◽  
huiqin Ling ◽  
Anmin Hu ◽  
Tao Hang ◽  
...  
Keyword(s):  
Phase Transition ◽  
Intermetallic Compounds ◽  
Barrier Layer ◽  
Growth Behavior ◽  
X Ray Diffraction ◽  
Potential Threat ◽  
X Ray ◽  
Cu Pillar ◽  
Cu Pillar Bump

Abstract With the shrinkage of size, porous Cu3Sn have become a new potential threat of the reliability in micron Cu pillar bump. The formation of porous Cu3Sn is contributed the decomposition of Cu6Sn5, which is caused by the overgrowth of intermetallic compounds (IMC) and the stress introduced by the phase transition of Cu6Sn5. In this paper, uniform Ф10 µm Cu/Sn and Cu/Ni (~0.6 μm)/Sn microbumps have been fabricated by multilayer electrodeposition and the effect of the Ni layer on the growth behavior of porous Cu3Sn was investigated by comparing the evolution of IMC in Cu/Sn and Cu/Ni/Sn bumps aged at 170 ℃ and 200 ℃. The ~0.6 μm Ni layer can effectively retard the Cu atoms diffusion, which can hinder IMC from overgrowth. Moreover, with the help of X-ray diffraction (XRD), the ability of the Ni layer in stabilizing Cu6Sn5 phase is strengthened, which weakens the tendency of the porous Cu3Sn formation. Under the conjoint action of retarding the growth of IMC and stabilizing Cu6Sn5 phase, the Ni layer can inhibit the formation of porous Cu3Sn efficaciously.

Electronic Study of Pt-Ga Intermetallic Compounds Using X-Ray Photoemission Spectroscopy

1990 ◽  
Author(s):  
Young K. Kim ◽  
David K. Shuh ◽  
R. S. Williams ◽  
Larry P. Sadwick ◽  
Kang L. Wang
Keyword(s):  
Intermetallic Compounds ◽  
Photoemission Spectroscopy ◽  
X Ray

Probing the microstructural evolution of polyviologen-silica hybrid nanopowders during intermediate processing using X-ray microtomography

2006 ◽  
Vol 85 (3) ◽  
pp. 317-324 ◽  
Author(s):  
O. Gundogdu ◽  
P.M. Jenneson ◽  
U. Tuzun ◽  
G.M. Gray ◽  
J.N. Hay
Keyword(s):  
Microstructural Evolution ◽  
X Ray ◽  
Silica Hybrid

scholarly journals Study of Structural, Magnetic, and Mossbauer Properties of Dy2Fe16Ga1−xNbx (0.0 ≤ x ≤ 1.0) Prepared via Arc Melting Process

2021 ◽  
Vol 7 (3) ◽  
pp. 42
Author(s):  
Jiba N. Dahal ◽  
Kalangala Sikkanther Syed Ali ◽  
Sanjay R. Mishra
Keyword(s):  
Isomer Shift ◽  
Cell Volume ◽  
Intermetallic Compounds ◽  
Unit Cell Volume ◽  
Rietveld Analysis ◽  
Unit Cell ◽  
X Ray Diffraction ◽  
X Ray ◽  
Arc Melting ◽  
Nb Content

Intermetallic compounds of Dy2Fe16Ga1−xNbx (x = 0.0 to 1.00) were synthesized by arc melting. Samples were investigated for structural, magnetic, and hyperfine properties using X-ray diffraction, vibration sample magnetometer, and Mossbauer spectrometer, respectively. The Rietveld analysis of room temperature X-ray diffraction data shows that all the samples were crystallized in Th2Fe17 structure. The unit cell volume of alloys increased linearly with an increase in Nb content. The maximum Curie temperature Tc ~523 K for x = 0.6 sample is higher than Tc = 153 K of Dy2Fe17. The saturation magnetization decreased linearly with increasing Nb content from 61.57 emu/g for x = 0.0 to 42.46 emu/g for x = 1.0. The Mössbauer spectra and Rietveld analysis showed a small amount of DyFe3 and NbFe2 secondary phases at x = 1.0. The hyperfine field of Dy2Fe16Ga1−xNbx decreased while the isomer shift values increased with the Nb content. The observed increase in isomer shift may have resulted from the decrease in s electron density due to the unit cell volume expansion. The substantial increase in Tc of thus prepared intermetallic compounds is expected to have implications in magnets used for high-temperature applications.

scholarly journals High-Temperature Oxidation Properties and Microstructural Evolution of Nanostructure Fe-Cr-Al ODS Alloys

Materials ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 526
Author(s):  
Zhengyuan Li ◽  
Lijia Chen ◽  
Haoyu Zhang ◽  
Siyu Liu
Keyword(s):  
High Temperature ◽  
Oxide Layer ◽  
Microstructural Evolution ◽  
High Temperature Oxidation ◽  
Oxide Dispersion Strengthened ◽  
Al Alloy ◽  
Temperature Oxidation ◽  
X Ray ◽  
Plasma Sintering ◽  
Ods Alloys

The oxidation behavior and microstructural evolution of the nanostructure of Fe-Cr-Al oxide dispersion strengthened (ODS) alloys prepared by spark plasma sintering were investigated by high-temperature oxidation experiments in air at 1200 °C for 100 h. The formation of Al2O3 scale was observed by X-ray diffraction (XRD) and scanning electron microscopy (SEM) with energy-dispersive X-ray spectroscopy (EDS) line scans. The oxidation rate of Fe-Cr-Al ODS alloys is lower than that of conventional Fe-Cr-Al alloys, and the oxide layer formed on the Fe-Cr-Al alloy appeared loose and cracked, whereas the oxide layer formed on the Fe-Cr-Al ODS alloys was adherent and flat. This is due to the high density of dispersed nano-oxides hindering the diffusion of Al element and the formation of vacancies caused by them. In addition, the nano-oxides could also adhere to the oxide layer. Besides, the microstructure of the Fe-Cr-Al ODS alloy had excellent stability during high-temperature oxidation.

scholarly journals Semisolid State Sintering Behavior of Aluminum–Stainless Steel 316L Composite Materials by Powder Metallurgy

Materials ◽  
2019 ◽  
Vol 12 (9) ◽  
pp. 1473 ◽  
Author(s):  
Kwangjae Park ◽  
Dasom Kim ◽  
Kyungju Kim ◽  
Seungchan Cho ◽  
Kenta Takagi ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Intermetallic Compounds ◽  
Vickers Hardness ◽  
Raw Materials ◽  
High Hardness ◽  
Engineering Industry ◽  
Sintering Behavior ◽  
Semisolid State ◽  
Stainless Steel 316L ◽  
X Ray

Aluminum (Al)-stainless steel 316L (SUS316L) composites were successfully fabricated by the spark plasma sintering process (SPS) using pure Al and SUS316L powders as raw materials. The Al-SUS316L composite powder comprising Al with 50 vol.% of SUS316L was prepared by a ball milling process. Subsequently, it was sintered at 630 °C at a pressure of 200 MPa and held for 5 min in a semisolid state. The X-ray diffraction (XRD) patterns show that intermetallic compounds such as Al13Fe4 and AlFe3 were created in the Al-SUS316L composite because the Al and SUS316L particles reacted together during the SPS process. The presence of these intermetallic compounds was also confirmed by using XRD, scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), and EDS mapping. The mechanical hardness of the Al-SUS316L composites was analyzed by a Vickers hardness tester. Surprisingly, the Al-SU316L composite exhibited a Vickers hardness of about 620 HV. It can be concluded that the Al-SUS316L composites fabricated by the SPS process are lightweight and high-hardness materials that could be applied in the engineering industry such as in automobiles, aerospace, and shipbuilding.

scholarly journals Understanding Nanoscale 4D Microstructural Evolution in Aluminum Alloys using Transmission X-Ray Microscopy (TXM)

2017 ◽  
Vol 23 (S1) ◽  
pp. 2220-2221
Author(s):  
C. Shashank Kaira ◽  
V. De Andrade ◽  
S. S. Singh ◽  
C. Kantzos ◽  
F. De Carlo ◽  
...  
Keyword(s):  
Aluminum Alloys ◽  
Microstructural Evolution ◽  
X Ray

Microstructure and Hardness of Ni-Cr Porous Preform Reinforced Al-Based Composites by Low Infiltration Method

2011 ◽  
Vol 275 ◽  
pp. 251-254
Author(s):  
Hua Wei Rong ◽  
Cheol Hong Park ◽  
Won Jo Park ◽  
Han Ki Yoon
Keyword(s):  
Intermetallic Compounds ◽  
Rapid Development ◽  
High Hardness ◽  
Optical Microscope ◽  
Matrix Composites ◽  
X Ray Diffraction ◽  
Infiltration Process ◽  
Pressure Infiltration ◽  
X Ray ◽  
Infiltration Method

With the rapid development of aerospace and automobile industries, metal matrix composites (MMCs) have attracted much attention because of its excellent performance. In this paper, Ni-Cr/AC8A composites reinforced with porous Ni-Cr preform were manufactured by low pressure infiltration process, infiltration temperatures are 700oC~850oC. The microstructure and phase composition of composites were evaluated using optical microscope, X-ray diffraction (XRD) and electro-probe microanalysis (EPMA), It's found that they're intermetallic compounds generated in the composites. Recently, intermetallic compounds have attracted much attention as high-temperature material. We study the hardness of Ni-Cr/AC8A composites, the results show the Ni-Cr/AC8A composite has high hardness due to the intermetallic compounds exist.

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