Effect of reciprocating extrusion temperature and passes on the microstructural evolution of Mg-5Sn-1Si-0.8Y alloy

2019 ◽  
Author(s):  
Heshuai Yu ◽  
Xuefeng Guo ◽  
Hongbao Cui ◽  
Jian Ma
Keyword(s):  
Microstructural Evolution ◽  
Extrusion Temperature ◽  
Reciprocating Extrusion

Microstructural Evolution in Reduced TiO2

1981 ◽  
Vol 39 ◽  
pp. 74-75
Author(s):  
W. T. Donlon ◽  
S. Shinozaki ◽  
E. M. Logothetis ◽  
W. Kaizer
Keyword(s):  
Microstructural Evolution ◽  
Point Defects ◽  
Extended Defects ◽  
Small Deviations ◽  
Controlled Atmospheres ◽  
Limited Solubility ◽  
Thin Foils ◽  
Heat Treated ◽  
Porous Polycrystalline ◽  
Crystallographic Shear

Since point defects have a limited solubility in the rutile (TiO2) lattice, small deviations from stoichiometry are known to produce crystallographic shear (CS) planes which accomodate local variations in composition. The material used in this study was porous polycrystalline TiO2 (60% dense), in the form of 3mm. diameter disks, 1mm thick. Samples were mechanically polished, ion-milled by conventional techniques, and initially examined with the use of a Siemens EM102. The electron transparent thin foils were then heat-treated under controlled atmospheres of CO/CO2 and H2 and reexamined in the same manner.The “as-received” material contained mostly TiO2 grains (∼5μm diameter) which had no extended defects. Several grains however, aid exhibit a structure similar to micro-twinned grains observed in reduced rutile. Lattice fringe images (Fig. 1) of these grains reveal that the adjoining layers are not simply twin related variants of a single TinO2n-1 compound. Rather these layers (100 - 250 Å wide) are alternately comprised of stoichiometric TiO2 (rutile) and reduced TiO2 in the form of Ti8O15, with the Ti8O15 layers on either side of the TiO2 being twin related.

MICROSTRUCTURAL EVOLUTION OF DIRECTIONALLY SOLIDIFIED Ni--BASED SUPERALLOY DZ125 UNDER PLANAR GROWTH

2010 ◽  
Vol 46 (9) ◽  
pp. 1075-1080 ◽  
Author(s):  
Zhixian MIN ◽  
Jun SHEN ◽  
Lingshui WANG ◽  
Zhourong FENG ◽  
Lin LIU ◽  
...  
Keyword(s):  
Microstructural Evolution ◽  
Directionally Solidified ◽  
Planar Growth

EFFECTS OF Ru AND Cr ON γ/γ' MICROSTRUCTURAL EVOLUTION OF Ni--BASED SINGLE CRYSTAL SUPERALLOYS DURING HEAT TREATMENT

2010 ◽  
Vol 46 (8) ◽  
pp. 897-906 ◽  
Author(s):  
Jingyang CHEN ◽  
Bin ZHAO ◽  
Qiang FENG ◽  
Lamei CAO ◽  
Zuqing SUN
Keyword(s):  
Heat Treatment ◽  
Single Crystal ◽  
Microstructural Evolution

Phase Stability and Microstructural Evolution in a Ductile Refractory High Entropy Alloy Al 10Nb 15Ta 5Ti 30Zr 40

2019 ◽  
Author(s):  
V. Soni ◽  
Oleg N. Senkov, PhD ◽  
Jean-Philippe Couzinie, PhD ◽  
Yufeng Zheng, PhD ◽  
Bharat Gwalani, PhD ◽  
...  
Keyword(s):  
Microstructural Evolution ◽  
Phase Stability ◽  
High Entropy Alloy ◽  
High Entropy
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