Inhibited cold compactibility of rapidly solidified Al–Si alloy powder with large solidification rate

2015 ◽  
Vol 26 (5) ◽  
pp. 1458-1464 ◽  
Author(s):  
Zhiyong Cai ◽  
Richu Wang ◽  
Chun Zhang ◽  
Chaoqun Peng ◽  
Yan Feng
Keyword(s):  
Alloy Powder ◽  
Solidification Rate ◽  
Rapidly Solidified

Shock consolidation of Ni-Ti alloy powder

1986 ◽  
Vol 44 ◽  
pp. 430-431
Author(s):  
Naresh N. Thadhani ◽  
Thad Vreeland ◽  
Thomas J. Ahrens
Keyword(s):  
Alloy Powder ◽  
Amorphous Material ◽  
Ti Alloy ◽  
Two Phase ◽  
Near Surface ◽  
Optical Micrograph ◽  
Shock Compaction ◽  
Powder Particles ◽  
Ti Powder ◽  
Rapidly Solidified

A spherically-shaped, microcrystalline Ni-Ti alloy powder having fairly nonhomogeneous particle size distribution and chemical composition was consolidated with shock input energy of 316 kJ/kg. In the process of consolidation, shock energy is preferentially input at particle surfaces, resulting in melting of near-surface material and interparticle welding. The Ni-Ti powder particles were 2-60 μm in diameter (Fig. 1). About 30-40% of the powder particles were Ni-65wt% and balance were Ni-45wt%Ti (estimated by EMPA).Upon shock compaction, the two phase Ni-Ti powder particles were bonded together by the interparticle melt which rapidly solidified, usually to amorphous material. Fig. 2 is an optical micrograph (in plane of shock) of the consolidated Ni-Ti alloy powder, showing the particles with different etching contrast.

Production and properties of rapidly solidified Al-4.5% Cu alloy powder by the rotating-water-atomization process

1985 ◽  
Vol 20 (6) ◽  
pp. 2148-2158 ◽  
Author(s):  
Itsuo Ohnaka ◽  
Isamu Yamauchi ◽  
Satoru Kawamoto ◽  
Tatsuichi Fukusako
Keyword(s):  
Alloy Powder ◽  
Atomization Process ◽  
Cu Alloy ◽  
Water Atomization ◽  
Rapidly Solidified

The Preparation of Rapidly Solidified and Powder Metallurgy AZ91 Alloy

2012 ◽  
Vol 476-478 ◽  
pp. 29-33
Author(s):  
Shao Ding Sheng ◽  
Hong Ge Yan
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Tensile Strength ◽  
Alloy Powder ◽  
Optical Microscope ◽  
Az91 Alloy ◽  
Precipitated Phase ◽  
Precipitated Phases ◽  
Rapidly Solidified ◽  
Equiaxed Grains

AZ91 alloy powder was prepared by two-roller quenching equipment. The powders were consolidated and extruded into bar. The microstructures of the powders and bars were observed by optical microscope (OM), XRD, HRTEM and SEM. The results suggested that the grain size of the powder were equiaxed with the sizes of about 1~5μm. The as-extruded alloy bars retain equiaxed grains with a large number of precipitated phases, β-Al12Mg17 and AlMg2Zn. The alloy exhibited excellent mechanical properties, the ultimate and yield tensile strength were 383.2MPa and 275.1MPa respectively. The shape of the precipitated phase was approximately globular with the size of about 50~200nm.

Effect of rapid solidification and calcium additions on Sn-38 wt.%Pb-6 wt.%Sb melt-spun alloys

2016 ◽  
pp. 3224-3235
Author(s):  
Rizk Mostafa Shalaby ◽  
Shalabia Badr ◽  
Nermin Ali Abdelhakim ◽  
Mustafa Kamal
Keyword(s):  
Elastic Moduli ◽  
Solidification Rate ◽  
Calcium Content ◽  
Density Fluctuations ◽  
Inter Metallic Compound ◽  
Quenching Rate ◽  
Mechanical And Electrical Properties ◽  
Melt Spun ◽  
Modes Of Interaction ◽  
Rapidly Solidified

The effect of calcium additions on the structure and physical properties of melt-spun process Sn-38Pb-6Sb alloys have been experimentally investigated at a solidification rate of ~105 K/s. Structure, internal friction, elastic moduli, microhardness and electrical resistivity of the Sn-38%Pb , Sn-38%Pb -6%Sb , Sn-38%Pb -6%Sb-0.5%Ca , Sn-38%Pb -6%Sb -1%Ca , Sn-38%Pb -6%Sb -1.5%Ca , Sn-38%Pb -6%Sb -2%Ca , Sn-38%Pb -6%Sb -2.5%Ca (in wt%) rapidly solidified alloys are investigated. The results showed that the mechanical and electrical properties values are enhanced for ternary Sn-38%Pb -6%Sb alloy. The examined mechanical and electrical conductivity decreased by addition of calcium content in the studied alloys. It also leads to with increasing Ca content the SnSb inter-metallic compound (IMC) precipitates are increased in the Sn matrix. The results were explained in terms of the dislocation theory, effect of quenching rate on the produced density fluctuations in composition and the modes of interaction of crystal lattice defects.

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