High Temperature Phase Transformation in a Cold-Rolled Fe-Mn-Si Alloy

2013 ◽  
Vol 803 ◽  
pp. 243-246
Author(s):  
Z.C. Zhou ◽  
D.K. Yang ◽  
J. Du ◽  
Y.J. Yan ◽  
S.Y. Gu ◽  
...  
Keyword(s):  
Phase Transformation ◽  
High Temperature ◽  
Internal Friction ◽  
Cold Rolling ◽  
Forced Vibration ◽  
Room Temperature ◽  
High Temperature Phase ◽  
Temperature Phase ◽  
Internal Friction Peak ◽  
Cold Rolled

The internal friction of a cold-rolled Fe-Mn-Si alloy has been investigated using a multifunctional internal friction apparatus though forced vibration method from room temperature to 950 °C. It has been shown that an internal friction peak is found on the IF-T curves during first heating at around 640 °C for the cold-rolled Fe-Mn-Si alloy. The internal friction peak is confirmed to be crystallizing peak of amorphous. The amorphous is resulted from the cold-rolling of the Fe-Mn-Si alloy.

High Temperature Internal Friction Relaxations in Cold-Rolled Titanium

2018 ◽  
Vol 279 ◽  
pp. 30-34
Author(s):  
Zheng Cun Zhou ◽  
J. Du ◽  
S.Y. Gu ◽  
Y.J. Yan
Keyword(s):  
Grain Size ◽  
Phase Transformation ◽  
High Temperature ◽  
Internal Friction ◽  
Room Temperature ◽  
Forced Oscillations ◽  
Internal Friction Peak ◽  
Temperature Relaxation ◽  
Cold Rolled ◽  
Cp Ti

The high temperature relaxation in cold-rolled Ti (CR-Ti) and commercial pure Ti (CP-Ti) has been investigated using internal friction apparatus operating in forced oscillations from room temperature to 650°C. It is shown that there is an internal friction peak at around 510°C for the CR-Ti and there is no 510°C internal friction peak in the CP-Ti. The internal friction peak shows typical features of phase transformation in the CR-Ti. It is tentatively suggested that this peak is due to the ordering of disordered lattices resulted from cold-rolling. The high temperature background damping (HTBD) in the CP-Ti is much lower than that in the CR-Ti. It is concluded that the HTBD is related to the microstructure observed inside the grains and does not dependent on grain size.

Microstructure and Crystallography of β Phase Formed through Electric Current Pulse (ECP) Treatment in Cold-Rolled Cu-40%Zn Alloy

2018 ◽  
Vol 941 ◽  
pp. 1117-1122
Author(s):  
Mei Shuai Liu ◽  
Yu Dong Zhang ◽  
Xin Li Wang ◽  
Benoit Beausir ◽  
Mao Lin Liu ◽  
...  
Keyword(s):  
Phase Transformation ◽  
High Temperature ◽  
Room Temperature ◽  
Alpha Phase ◽  
High Temperature Phase ◽  
Temperature Phase ◽  
Metallic Materials ◽  
Product Phase ◽  
Cold Rolled ◽  
Zn Alloy

Most of the studies on phase transformation in metallic materials have focused on transformations during cooling processes due to the easiness of the conservation of the product phase. However, for phase transformation happening during heating processes, the experimental investigations have been indirect if the product high temperature phase could not be preserved to the convenient observation temperature, for example the room temperature. The high density Electric Current Pulse (ECP) treatment allows the phase transformation during heating process and the preservation of the high temperature phase to the room temperature, offering possibilities for direct experimental examinations. Thus, in the present work, a cold-rolled Cu–40%Zn alloy was ECP treated and the microstructure of the product phase and the transformation orientation relationship were investigated. Results show that during the ECP treatment, the high temperature beta phase with BCC structure formed in the parent alpha phase with FCC structure. Especially, two kinds of orientation relationships could be detected between the parent alpha phase and the product beta precipitates. The one is the Kurdjumov-Sachs orientation relationship (K-S OR), and the other is the Nishiyama-Wasserman (N-W). In addition, the amount of beta precipitates obeying the K-S OR is more than that of precipitates obeying the N-W OR. The results of this work provide new fundamental information on phase transformation of metallic materials.

Humidity sensitive irreversible phase transformation of an open-framework Zinc phosphate and its water-assisted high proton conduction properties

2021 ◽  
Author(s):  
Jing-Wei Yu ◽  
Hai-Jiao Yu ◽  
Qiu Ren ◽  
Jin Zhang ◽  
Yang Zou ◽  
...  
Keyword(s):  
Phase Transformation ◽  
High Temperature ◽  
Zinc Phosphate ◽  
High Temperature Phase ◽  
Temperature Phase ◽  
Open Framework ◽  
High Proton ◽  
Irreversible Phase Transformation ◽  
Low Temperature Phase ◽  
Conduction Properties

Open-framework zinc phosphate (NMe4)(ZnP2O8H3) undergoes irreversible phase transformation. Structural transformation with α (NMe4.Zn[HPO4][H2PO4] the low-temperature phase) and β (NMe4.ZnH3[PO4]2 the high-temperature phase) (Tc=149 °C) and conduction properties were investigated by...

Irreversible single-crystal to polycrystal and reversible single-crystal to single-crystal phase transformations in cyanurates

2001 ◽  
Vol 57 (6) ◽  
pp. 791-799 ◽  
Author(s):  
Menahem Kaftory ◽  
Mark Botoshansky ◽  
Moshe Kapon ◽  
Vitaly Shteiman
Keyword(s):  
Phase Transformation ◽  
High Temperature ◽  
Low Temperature ◽  
Single Crystal ◽  
High Temperature Phase ◽  
Monoclinic Space Group ◽  
Temperature Phase ◽  
Space Group ◽  
Reversible Phase ◽  
Low Temperature Phase

4,6-Dimethoxy-3-methyldihydrotriazine-2-one (1) undergoes a single-crystal to single-crystal reversible phase transformation at 319 K. The low-temperature phase crystallizes in monoclinic space group P21/n with two crystallographically independent molecules in the asymmetric unit. The high-temperature phase is obtained by heating a single crystal of the low-temperature phase. This phase is orthorhombic, space group Pnma, with the molecules occupying a crystallographic mirror plane. The enthalpy of the transformation is 1.34 kJ mol−1. The small energy difference between the two phases and the minimal atomic movement facilitate the single-crystal to single-crystal reversible phase transformation with no destruction of the crystal lattice. On further heating, the high-temperature phase undergoes methyl rearrangement in the solid state. 2,4,6-Trimethoxy-1,3,5-triazine (3), on the other hand, undergoes an irreversible phase transformation from single-crystal to polycrystalline material at 340 K with an enthalpy of 3.9 kJ mol−1; upon further heating it melts and methyl rearrangement takes place.

A new polymorph of Cd3B2O6: synthesis, crystal structure and phase transformation

RSC Advances ◽  
2014 ◽  
Vol 4 (25) ◽  
pp. 13195-13200 ◽  
Author(s):  
Xingwen Zhang ◽  
Hongwei Yu ◽  
Hongping Wu ◽  
Shilie Pan ◽  
Anqing Jiao ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Phase Transformation ◽  
High Temperature ◽  
Transformation Process ◽  
High Temperature Phase ◽  
Temperature Phase ◽  
Phase Transformation Process

A new high-temperature phase of Cd3B2O6 (β-Cd3B2O6) has been discovered and the phase transformation process between α- and β-Cd3B2O6 was investigated.

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