Synthesis of Ag-Cu-Sn Nanocrystalline Alloys as Intermediate Temperature Solder by High Energy Ball Milling

2009 ◽  
Vol 79-82 ◽  
pp. 449-452 ◽  
Author(s):  
Liang Feng Li ◽  
Tai Qiu ◽  
Jian Yang ◽  
Yong Bao Feng
Keyword(s):  
Grain Size ◽  
Ball Milling ◽  
High Energy ◽  
Nanocrystalline Alloys ◽  
High Energy Ball Milling ◽  
Intermediate Temperature ◽  
Melting Points ◽  
Small Particles ◽  
Average Grain Size ◽  
Energy Ball

To obtain intermediate temperature alloy solders with melting temperature of 400~600°C, (Ag-Cu28)-25Sn and (Ag-Cu28)-30Sn alloys were prepared by high energy ball milling. Ag-Cu-Sn nanocrystalline alloys have been obtained after milling for 40h. XRD results show that the (Ag-Cu28)-25Sn alloy consists of Ag4Sn and Cu3Sn, and the (Ag-Cu28)-30Sn alloy contains Ag4Sn, Cu3Sn and Cu6Sn5. The small polydispersed particles with size ranging from 1μm to about 25μm are observed from the (Ag-Cu28)-30Sn alloys milled for 40h by SEM. A large amount of small particles comprised of two or three grains are commonly observed by HRTEM, and average grain size is about 17.50nm. DSC results indicate that the melting points of the (Ag-Cu28)-25Sn and (Ag-Cu28)-30Sn alloys milled for 40h are 548.5°C and 539.3°C, respectively.

Phase development during high-energy ball-milling of zinc oxide and iron – the impact of grain size on the source and the degree of contamination

2015 ◽  
Vol 44 (43) ◽  
pp. 18870-18881 ◽  
Author(s):  
G. Štefanić ◽  
S. Krehula ◽  
I. Štefanić
Keyword(s):  
Grain Size ◽  
Zinc Oxide ◽  
Ball Milling ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Degree Of Contamination ◽  
Phase Development ◽  
Energy Ball ◽  
The Impact

The impact of grain size on the source and the degree of contamination.

Decomposition and Crystallization Induced by High-Energy Ball-Milling

2007 ◽  
Vol 119 ◽  
pp. 1-4 ◽  
Author(s):  
Young Soon Kwon ◽  
Ji Soon Kim ◽  
Cheol Eeh Kim
Keyword(s):  
Grain Size ◽  
Phase Transformation ◽  
Ball Milling ◽  
Milling Time ◽  
High Energy ◽  
Thermally Induced ◽  
Average Grain Size ◽  
Powder Particles ◽  
Energy Ball ◽  
Decomposition Behavior

Phase transformation induced by ball-milling was studied in this work. It was found that amorphous Fe90Zr10 ribbons undergo crystallization into BCC α-Fe(Zr) under milling in an AGO-2 mill. The decomposition degree of the amorphous phase increased with increasing milling time and intensity. Analyses of samples milled at different speeds suggested that the observed crystallization is a deformation-induced process rather than a thermally induced one. In addition, the decomposition behavior of a FeSn intermetallic under ball-milling was carefully studied. Upon milling a large amount of the FeSn intermetallic decomposed into Fe5Sn3 and FeSn2, where the average grain size of the product phases stayed nearly constant with milling-time. It is suggested that the mechanically driven decomposition of FeSn results from local melting of powder particles due to high temperature pulses during ball collisions.

Preparation of WC-5TiC-10Co Nanometer Powder and Performance Study of Sintering Samples

2012 ◽  
Vol 465 ◽  
pp. 220-223 ◽  
Author(s):  
Chong Cai Zhang ◽  
Quan Wang ◽  
Qun Qun Yuan ◽  
Yong Fei Yang ◽  
Xiao Lan Yi
Keyword(s):  
Grain Size ◽  
Compressive Strength ◽  
Ball Milling ◽  
High Energy ◽  
Cemented Carbides ◽  
Performance Study ◽  
Vacuum Sintering ◽  
Average Grain Size ◽  
Energy Ball ◽  
And Performance

In this paper, the WC-5TiC-10 Co mixture mixed by WC2.96μm, (Ti, W)C 2.52μm and Co2.38μm and prepared by high-energy ball milling. The result shows: After 60h’s ball milling the powder began to reunite more and more as the time extended . The average grain size of powder is 50 nm after144h. After 1300°C~1400°C vacuum-sintering the hardness of the sample is 94.8 ~ 95.4HRA. 4.2 ~ 5.2 HRA higher than the traditional cemented carbides with the same composition. After 1400°C vacuum-sintering the compressive strength and flexural strength of cemented carbides is 2060 MPa and 1200 MPa. Slightly less than the traditional cemented carbides with the same composition.

Microstructure of 430L Stainless Steel Powders during High-Energy Ball Milling

2007 ◽  
Vol 561-565 ◽  
pp. 1251-1254
Author(s):  
Hong Wei Ni ◽  
Hang He ◽  
G.Q. Li ◽  
Wei Ting Zhan ◽  
Da Qiang Cang ◽  
...  
Keyword(s):  
Particle Size ◽  
Grain Size ◽  
Stainless Steel ◽  
Ball Milling ◽  
High Energy ◽  
High Energy Ball Milling ◽  
X Ray Diffraction ◽  
Initial Stage ◽  
Energy Ball ◽  
The Mean

Preparation of nanocrystalline 430L stainless steel powders by high-energy ball milling has been investigated. The samples were characterized by scanning electron microscope (SEM), X-ray Diffraction (XRD) and Matersizer. The SEM observation confirmed that the cold welding and fragmentation behaviors occurred during high-energy ball milling, which has important effect on the changes of the particle size. In the initial stage (0-10h), particle size increased and crystalline grain size decreased evidently. The mean particle size got to 330μm and the crystalline grain size got to 23nm for sample of 10h ball milling. In the later stage, the particle size decreased and the refinement of crystalline grain became difficult. The crystalline grain size of sample for 50h ball milling only got to 15nm.

Effect of grain size on structural and dielectric properties of barium titanate piezoceramics synthesized by high energy ball milling

2018 ◽  
Author(s):  
Narendra Kumar Verma ◽  
Sandeep Kumar Singh Patel ◽  
Dinesh Kumar ◽  
Chandra Bhal Singh ◽  
Akhilesh Kumar Singh
Keyword(s):  
Grain Size ◽  
Dielectric Properties ◽  
Barium Titanate ◽  
Ball Milling ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Energy Ball

Bulk Nanocrystalline Cu Produced by High-Energy Ball Milling

2011 ◽  
Vol 682 ◽  
pp. 25-32
Author(s):  
Cai Ju Li ◽  
Xin Kun Zhu ◽  
Jing Mei Tao ◽  
H.L. Tang ◽  
T.L. Chen
Keyword(s):  
Grain Size ◽  
Ball Milling ◽  
Milling Time ◽  
High Energy ◽  
Crystal Defects ◽  
High Energy Ball Milling ◽  
Energy Ball ◽  
Bulk Nanocrystalline ◽  
Pure Cu ◽  
Ball Milling Time

The preparation, mechanical properties, grain size and thermal property of bulk nanocrystalline Cu (BNC-Cu) were investigated in this paper. BNC-Cu can be produced by in situ consolidation of pure Cu powder with high-energy ball milling at room temperature; the average grain sizes of Cu samples decreased with the increasing of ball milling time before 9 h because the grain refining velocity was bigger than the grain growing velocity in this stage. When the ball milling time was beyond 9 h, the average grain size reached a steady minimum value about 27.5 nm. The microhardness of BNC-Cu samples increased with the extending of ball milling time in the first 9 h because the dominating factor was the hardening effect caused by grain refinement and work hardening rather than softening in this stage. BNC-Cu gained its highest microhardness about 1.59GPa when the ball milling time reached 9 h. Subsequently, the microhardness of BNC-Cu slightly fluctuated around this value. Because there were numerous triple grain boundaries and the interaction among different crystal defects in BNC-Cu, BNC-Cu showed outstanding thermal stability when it was annealed in the range of 100°C to 400°C.

Crystal growth and the steady-state grain size during high-energy ball-milling

2001 ◽  
Vol 56 (3) ◽  
pp. 441-446 ◽  
Author(s):  
S Mørup ◽  
J. Z Jiang ◽  
F Bødker ◽  
A Horsewell
Keyword(s):  
Grain Size ◽  
Crystal Growth ◽  
Steady State ◽  
Ball Milling ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Energy Ball

Porous Nanocrystalline Alloys Prepared by High Energy Ball Milling

1998 ◽  
Vol 269-272 ◽  
pp. 1055-1060 ◽  
Author(s):  
Robert Schulz ◽  
G. Lalande ◽  
Jacques Huot ◽  
S. Boily
Keyword(s):  
Ball Milling ◽  
High Energy ◽  
Nanocrystalline Alloys ◽  
High Energy Ball Milling ◽  
Energy Ball

scholarly journals Effect of Grain Size on Nanostructured Fe-20 wt.%Si Alloy Powders Produced by High-energy ball milling

2005 ◽  
Vol 12 (5) ◽  
pp. 362-368
Author(s):  
Se-Hoon Kim ◽  
Young Jung Lee ◽  
Baek-Hee Lee ◽  
Kyu Hwan Lee ◽  
Young Do Kim
Keyword(s):  
Grain Size ◽  
Ball Milling ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Energy Ball
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