scholarly journals Influence of Li Addition to Zn-Al Alloys on Cu Substrate During Spreading Test and After Aging Treatment

2016 ◽  
Vol 45 (12) ◽  
pp. 6067-6078 ◽  
Author(s):  
Tomasz Gancarz ◽  
Janusz Pstrus ◽  
Grzegorz Cempura ◽  
Katarzyna Berent
Keyword(s):  
Aging Treatment ◽  
Al Alloys ◽  
Cu Substrate ◽  
Spreading Test

The mechanical properties of a joint of Sn-3.5Ag-1Zn solder and Cu substrate with aging treatment

2005 ◽  
Vol 96 (2) ◽  
pp. 148-154 ◽  
Author(s):  
Doh Jae Lee ◽  
Dae Hwa Baek ◽  
Kyung Ku Lee ◽  
Kwang Min Lee ◽  
Youn Jong Seo
Keyword(s):  
Mechanical Properties ◽  
Aging Treatment ◽  
Cu Substrate

The Influence of 0.1% Sc Addition on the Microstructure and Texture Development in Al-Zn-Mg-Cu-Zr Alloys

2007 ◽  
Vol 539-543 ◽  
pp. 463-468
Author(s):  
Dong Seok Chung ◽  
C.W. Jea ◽  
No Jin Park ◽  
J.K. Kim
Keyword(s):  
Cold Rolling ◽  
Solution Treatment ◽  
Aging Treatment ◽  
Al Alloys ◽  
Texture Development ◽  
Plastic Behavior ◽  
Al Alloy ◽  
Normal Anisotropy ◽  
Plastic Strain Ratio ◽  
Zr Alloys

In this study, the microstructure and the texture development in Al–Zn–Mg–Cu–Zr alloys with/without 0.1%Sc has been investigated after extrusion, cold rolling, and aging treatment. After aging treatment, in Al alloy without Sc recrystallized equiaxed grains are obtained, while in Al alloy with Sc fine grains with an average size of 0.1~0.3 μm are obtained. After cold rolling, in case of the sample from the cross section (CS) to which Sc was added, texture with {112}<111>(Cu) + weak {123}<634>(S) component was developed while in case of the sample from longitudinal section (LS) to which Sc was added, texture with strong β-fiber + {110}<001>(Goss) components was developed. In case of CS and LS without Sc, texture of β-fiber was developed. After solid solution treatment and aging treatment, Al alloys (LS and CS) with Sc had rolling texture while Al alloys without Sc had random texture. The role of these differently developed textures in the plastic behavior, such as the normal anisotropy r-value (the plastic strain ratio) and planar anisotropy r-values are discussed.

High temperature solders containing Aluminum and Zinc

2010 ◽  
Vol 2010 (HITEC) ◽  
pp. 000122-000128
Author(s):  
H.R. Kotadia ◽  
O. Mokhtari ◽  
M. Bottrill ◽  
M. P. Clode ◽  
M. A. Green ◽  
...  
Keyword(s):  
Solder Joint ◽  
Solder Alloy ◽  
Aging Treatment ◽  
Joint Interface ◽  
Phase Identification ◽  
Cu Substrate ◽  
Weakest Link ◽  
Contact Metallization ◽  
Sac Solder ◽  
Zn Alloys

In this study, we will consider the effect of adding 1–1.5wt.% of Al and Zn to SAC alloy solders in order to limit IMC growth between the solder and the contact metallization. The Al and Zn react strongly with the surfaces on the electronic component and the substrate metallizations that are to be joined. At the solder joint interface, the IMC layer continues to grow at high temperatures and, being brittle, becomes the weakest link in the solder joint. In present work, the interfacial reaction studies were carried out on Cu and Ni(P) substrates. The resultant solder joint microstructure after reflow and isothermal aging at 150 °C up to 500h were investigated under scanning electron microscopy (SEM) with energy-dispersive x-ray analysis (EDX) for phase identification and optical microscopy (OM) for qualitative and quantitative analysis. Our experimental results have confirmed that addition of Al and Zn alloys forms Al-Cu and Cu-Zn on Cu substrate and Al-Ni on Ni(P) substrate respectively. In addition, results have confirmed that addition of Zn alloys plays a crucial role in the composition of IMCs. Addition of Zn (&gt;1wt.%) into basic SAC solder alloy, leads to massive spalling on Cu substrate during reaction. It has been found that additions of Zn into SAC solder alloy can significantly suppress the IMC growth during the aging treatment.

Observation of faint contrast at planar faults in alloys

1978 ◽  
Vol 36 (1) ◽  
pp. 340-341
Author(s):  
K. Kuroda ◽  
Y. Tomokiyo ◽  
T. Kumano ◽  
T. Eguchi
Keyword(s):  
Reciprocal Lattice ◽  
Beam Theory ◽  
Al Alloys ◽  
Small Displacement ◽  
Electron Microscopic ◽  
Lattice Vector ◽  
Fringe Contrast ◽  
Planar Fault ◽  
Lattice Displacement ◽  
The Many

The contrast in electron microscopic images of planar faults in a crystal is characterized by a phase factor , where is the reciprocal lattice vector of the operating reflection, and the lattice displacement due to the fault under consideration. Within the two-beam theory a planar fault with an integer value of is invisible, but a detectable contrast is expected when the many-beam dynamical effect is not negligibly small. A weak fringe contrast is also expected when differs slightly from an integer owing to an additional small displacement of the lattice across the fault. These faint contrasts are termed as many-beam contrasts in the former case, and as ε fringe contrasts in the latter. In the present work stacking faults in Cu-Al alloys and antiphase boundaries (APB) in CuZn, FeCo and Fe-Al alloys were observed under such conditions as mentioned above, and the results were compared with the image profiles of the faults calculated in the systematic ten-beam approximation.

Microstructure of an extruded rapidly solidified Al-8Fe-2Mo alloy

1986 ◽  
Vol 44 ◽  
pp. 548-549
Author(s):  
W. T. Donlon ◽  
J. E. Allison ◽  
S. Shinozaki
Keyword(s):  
Electron Microscopy ◽  
Automotive Industry ◽  
Fuel Economy ◽  
High Strength ◽  
Al Alloys ◽  
Light Weight ◽  
Thin Sections ◽  
Strength And Durability ◽  
Rapidly Solidified ◽  
Whitney Aircraft

Light weight materials which possess high strength and durability are being utilized by the automotive industry to increase fuel economy. Rapidly solidified (RS) Al alloys are currently being extensively studied for this purpose. In this investigation the microstructure of an extruded Al-8Fe-2Mo alloy, produced by Pratt & Whitney Aircraft, Goverment Products Div. was examined in a JE0L 2000FX AEM. Both electropolished thin sections, and extraction replicas were examined to characterize this material. The consolidation procedure for producing this material included a 9:1 extrusion at 340°C followed by a 16:1 extrusion at 400°C, utilizing RS powders which have also been characterized utilizing electron microscopy.

Microstructure of resistance spot welding of maraging steels

1990 ◽  
Vol 48 (4) ◽  
pp. 900-901
Author(s):  
I. Neuman ◽  
S.F. Dirnfeld ◽  
I. Minkoff
Keyword(s):  
Maraging Steel ◽  
Spot Welding ◽  
Lath Martensite ◽  
Base Material ◽  
Aging Treatment ◽  
High Strength ◽  
Maraging Steels ◽  
Heat Treated ◽  
Current Cycle ◽  
Welding Processes

Experimental work on the spot welding of Maraging Steels revealed a surprisingly low level of strength - both in the as welded and in aged conditions. This appeared unusual since in the welding of these materials by other welding processes (TIG,MIG) the strength level is almost that of the base material. The maraging steel C250 investigated had the composition: 18wt%Ni, 8wt%Co, 5wt%Mo and additions of Al and Ti. It has a nominal tensile strength of 250 KSI. The heat treated structure of maraging steel is lath martensite the final high strength is reached by aging treatment at 485°C for 3-4 hours. During the aging process precipitation takes place of Ni3Mo and Ni3Ti and an ordered solid solution containing Co is formed.Three types of spot welding cycles were investigated: multi-pulse current cycle, bi-pulse cycle and single pulsle cycle. TIG welded samples were also tested for comparison.The microstructure investigations were carried out by SEM and EDS as well as by fractography. For multicycle spot welded maraging C250 (without aging), the dendrites start from the fusion line towards the nugget centre with an epitaxial growth region of various widths, as seen in Figure 1.

THE FORMATION OF VACANCIES IN ORDERED Fe-Al ALLOYS WITH B2 STRUCTURE

1977 ◽  
Vol 38 (C7) ◽  
pp. C7-364-C7-364 ◽  
Author(s):  
D. PARIS ◽  
P. LESBATS
Keyword(s):  
Al Alloys ◽  
B2 Structure
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