scholarly journals Formability of laser welded steel/magnesium dissimilar metal with Sn powder-adhesive interlayer

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Tao Tao ◽  
Jinshui Liu ◽  
Dianwu Zhou ◽  
Youruiling Yan ◽  
He Zhou
Keyword(s):  
Magnesium Alloy ◽  
Molten Pool ◽  
Adhesive Layer ◽  
Metal Vapor ◽  
Fusion Welding ◽  
Columnar Dendrite ◽  
Laser Fusion ◽  
Welded Steel ◽  
X Ray ◽  
Finite Element Software

Abstract The exploratory experiments of laser fusion welding with Sn powder and the automotive adhesive addition were conducted for DP590 dual-phase steel and AZ31B magnesium alloy in an overlap steel-on-magnesium configuration. The characteristics of metal vapor/plasma were analyzed by collecting and analyzing plasma shape and welding spectra. The microstructure of the welded was characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), energy dispersive X-ray spectrometer (EDS). The temperature field distribution of the joint was simulated by COMSOL finite-element software. The results showed that the transfer of heat from steel to the magnesium alloy is hindered by the adhesive layer, which is conducive to the simultaneous melting of steel and magnesium with large differences in melting and boiling points. In addition, the width of the molten pool increases, but the depth is shallow on the magnesium side. Meanwhile, the recoil pressure induced by the splashing of the molten pool reduces, and the surface quality of the weld is improved. Some intermetallic compounds (IMCs), such as FeSn, Fe1.3Sn, and Fe3Sn, are formed inside the molten pool, while columnar dendrite Mg2Sn phase is also produced. The presence of these phases helps realize the bidirectional metallurgical bonding of steel/magnesium dissimilar metals.

Utilisation of High-Energy Heat Sources in Magnesium Alloy Surface Layer Treatment

2013 ◽  
Vol 58 (2) ◽  
pp. 619-624 ◽  
Author(s):  
M. Szafarska ◽  
J. Iwaszko ◽  
K. Kudła ◽  
I. Łegowik
Keyword(s):  
Surface Layer ◽  
Magnesium Alloy ◽  
Physicochemical Properties ◽  
Treatment Effectiveness ◽  
High Energy ◽  
Alloy Surface ◽  
Heat Sources ◽  
X Ray ◽  
Additional Equipment ◽  
Alloy Surface Layer

The main aim of the study was the evaluation of magnesium alloy surface treatment effectiveness using high-energy heat sources, i.e. a Yb-YAG Disk Laser and the GTAW method. The AZ91 and AM60 commercial magnesium alloys were subject to surface layer modification. Because of the physicochemical properties of the materials studied in case of the GTAW method, it was necessary to provide the welding stand with additional equipment. A novel two-torch set with torches operating in tandem was developed within the experiment. The effectiveness of specimen remelting using a laser and the GTAW method was verified based on macro- and microscopic examinations as well as in X-ray phase analysis and hardness measurements. In addition, the remelting parameters were optimised. The proposed treatment methodology enabled the achieving of the intended result and effective modification of a magnesium alloy surface layer.

X-ray emission from laser fusion targets

1981 ◽  
Author(s):  
V. W. Slivinsky
Keyword(s):  
Laser Fusion ◽  
X Ray

MICRO CAPILLARY ARRAY ELECTROPHORESIS CHIP BY MOVING MASK LIGA TECHNOLOGY

2004 ◽  
Vol 01 (01) ◽  
pp. 39-46
Author(s):  
HUI YOU ◽  
SHOUJI SHINOHARA ◽  
KENNICHI ENAMI ◽  
SHINSUKE SHIBATA ◽  
OSAMU TABATA ◽  
...  
Keyword(s):  
Adhesive Bonding ◽  
Dna Analysis ◽  
Adhesive Layer ◽  
Fabrication Process ◽  
Optical Components ◽  
X Ray ◽  
Laser Induced Fluorescence Detection ◽  
Capillary Array Electrophoresis ◽  
Liga Technology ◽  
Capillary Array

The concept and the fabrication process of a micro capillary array electrophoresis (μ-CAE) for DNA analysis were stated. The chip was mainly made of plastic and fabricated by the innovatory LIGA technology which included moving mask deep X-ray lithography, electroplating and hot embossing, and assembled by an adhesive bonding, in which the adhesive layer solidified and formed firm bond under UV exposure. The micro channel array with high aspect ratio is the key part, whose wall should have a slight inclination to ensure the demoulding. It was demonstrated that moving mask deep X-ray lithography (M2DXL) technology could successfully control the inclination and enabled to integrate micro optical components such as micro lens into the chip, which improved detection performance greatly. The fabrication process was experimented and some initial prototype chips have been obtained. Fluidic test and electrophoresis test with laser-induced fluorescence detection has been done on the prototype. The results confirm that the μ-CAE by moving mask LIGA process is realizable and it has great potential in high-throughput, which may lead to ultra-fast DNA analysis.

Room Temperature Screw Form Rolling of AZ91D Magnesium Alloy through Processing by Extrusion-Torsion Simultaneous Working

2014 ◽  
Vol 783-786 ◽  
pp. 375-379
Author(s):  
Mitsuaki Furui ◽  
Shouyou Sakashita ◽  
Kazuya Shimojima ◽  
Tetsuo Aida ◽  
Kiyoshi Terayama ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Room Temperature ◽  
Hardness Measurement ◽  
Rolling Process ◽  
X Ray Diffraction ◽  
X Ray ◽  
Az91d Magnesium Alloy ◽  
Microstructure Observation ◽  
Fine Grain ◽  
Simultaneous Processing

Extrusion-torsion simultaneous processing is a very attractive technique for fabricating a rod-shape material with fine grain and random texture. We have proposed a new screw form rolling process combined with preliminary extrusion-torsion simultaneous working. Microstructure evolution and mechanical property change of AZ91D magnesium alloy during extrusion-torsion simultaneous processing was examined through microstructure observation, X-ray diffraction analysis and micro-Vickers hardness measurement. By the addition of torsion, the crystal orientation of AZ91D magnesium alloy workpiece was drastically changed from basal crystalline orientation to the random orientation. Crystal grain occurred through the dynamic recrystallization and tended to coarsen with an increase of extrusion-torsion temperature. Grain refinement under 2 um was achieved at the lowest extrusion-torsion temperature of 523 K. M8 gauge AZ91D magnesium alloy screw was successfully formed at room temperature using the extrusion-twisted workpiece preliminary solution treating at 678 K for 345.6 ks. It was found that the extrusion-torsion temperature of 678 K must be selected to fabricate the good screw without any defects.

scholarly journals Keyhole formation and thermal fluid flow-induced porosity during laser fusion welding in titanium alloys: Experimental and modelling

2017 ◽  
Vol 126 ◽  
pp. 251-263 ◽  
Author(s):  
Chinnapat Panwisawas ◽  
Bama Perumal ◽  
R. Mark Ward ◽  
Nathanael Turner ◽  
Richard P. Turner ◽  
...  
Keyword(s):  
Fluid Flow ◽  
Titanium Alloys ◽  
Fusion Welding ◽  
Laser Fusion ◽  
Thermal Fluid Flow

scholarly journals Ultrafast Gated Intensifier Design for Laser Fusion X-Ray Framing Applications

1984 ◽  
Vol 31 (1) ◽  
pp. 504-508 ◽  
Author(s):  
Robert H. Price ◽  
Jay D. Wiedwald ◽  
Ralph Kalibjian ◽  
Stanley W. Thomas ◽  
William M. Cook
Keyword(s):  
Laser Fusion ◽  
X Ray

Spatially Resolved Suprathermal X-Ray Emission from Laser-Fusion Targets

1980 ◽  
Vol 44 (9) ◽  
pp. 579-582 ◽  
Author(s):  
N. M. Ceglio ◽  
J. T. Larsen
Keyword(s):  
Laser Fusion ◽  
X Ray ◽  
Spatially Resolved

The Superstructure in the a Phase of Silver-Magnesium Alloys

1950 ◽  
Vol 3 (2) ◽  
pp. 284
Author(s):  
LM Clarebrough ◽  
JF Nicholas
Keyword(s):  
Electrical Resistivity ◽  
Magnesium Alloy ◽  
Magnesium Alloys ◽  
X Ray ◽  
Silver Magnesium

X-ray and electrical resistivity studies of a silver-magnesium alloy containing 25 atomic per cent, of magnesium are described. From the results, it is concluded that a superlattice exists at this composition, the order-disorder transformation occurring between 386 and 389 �C.

scholarly journals CLEO/QELS '92 REPORT III. Gas Lasers, X-ray Lasers, Laser Fusion, Laser Spectroscopy.

1992 ◽  
Vol 20 (7) ◽  
pp. 572-587
Author(s):  
Masayuki KAKEHATA ◽  
Hideo HIROSE ◽  
Masanobu YAMANAKA ◽  
Takahisa JITSUNO ◽  
Tadashi KANABE ◽  
...  
Keyword(s):  
Laser Spectroscopy ◽  
Laser Fusion ◽  
X Ray ◽  
Gas Lasers
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