Structure/property observations for Al–Ti–Cr intermetallic alloys

1994 ◽  
Vol 9 (2) ◽  
pp. 255-258 ◽  
Author(s):  
J.L. Klansky ◽  
J.P. Nic ◽  
D.E. Mikkola
Keyword(s):  
Mechanical Properties ◽  
Single Phase ◽  
Intermetallic Alloys ◽  
Structure Property ◽  
Multiphase Alloys ◽  
Microstructures And Mechanical Properties ◽  
Two Phases ◽  
The Individual

The microstructures and mechanical properties of single phase and multiphase alloys are reported for Al-rich intermetallic alloys containing up to 45 at. % Ti and as much as 68 at. % Cr. Among the individual phases formed in these alloys, TiAl and tau (Al67Cr8Ti25) had both the lowest hardnesses and the greatest resistance to cracking. Additionally, the presence of these two phases in multiphase alloys improved mechanical properties.

Effect of Ferrite Volume Fraction on Mechanical Properties of X80 Pipeline Steel

2014 ◽  
Vol 989-994 ◽  
pp. 212-215
Author(s):  
J. Liu ◽  
G. Zhu ◽  
W. Mao
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Work Hardening ◽  
Single Phase ◽  
Volume Fraction ◽  
Pipeline Steel ◽  
X80 Pipeline Steel ◽  
Hardening Behavior ◽  
Two Phases ◽  
Better Than

The effect of volume fraction of ferrite on the mechanical properties including strength, plasticity and wok hardening was systematically investigated in X80 pipeline steel in order to improve the plasticity. The microstructures with different volume fraction of ferrite and bainite were obtained by heat-treatment processing and the mechanical properties were tested. The work hardening behavior was analyzed by C-J method. The results show that the small amount of ferrite could effectively improve the plasticity. The work hardening ability and the ratio of yield/tensile strength with two phases of ferrite/bainite would be obviously better than that with single phase of bainite. The improvement of plasticity could be attributed to the ferrite in which more plastic deformation was afforded.

Processing, Structure, Texture and Microtexture in Titanium Alloys

2012 ◽  
Vol 710 ◽  
pp. 66-84 ◽  
Author(s):  
Dipankar Banerjee ◽  
Adam L. Pilchak ◽  
James C. Williams
Keyword(s):  
Titanium Alloys ◽  
Single Phase ◽  
Thermomechanical Processing ◽  
Strong Dependence ◽  
Two Phase ◽  
Β Phase ◽  
Phase Fields ◽  
Deformation And Heat Treatment ◽  
Two Phases ◽  
The Individual

We review the effect of processing on structure and texture in titanium alloys, focusing on the understanding of this relationship that has evolved over the last decade. Thermomechanical processing cycles for these alloys involve deformation and heat treatment in single phase β and two phase, α+β, phase fields, and involves a complex interplay between deformation and recrystallization textures of the individual phases, textures arising from the crystallographic relationship between the two phases, and the scale of microstructure evolution. We explore these interactions and trace the strong dependence of thermomechanical pathways on the final structure and texture.

Mechanical Properties of Zr-Added Fe-Al Intermetallic Alloys Containing Large Second Phase Particles

2007 ◽  
Vol 561-565 ◽  
pp. 399-402 ◽  
Author(s):  
J. Machida ◽  
Satoru Kobayashi ◽  
Yasuyuki Kaneno ◽  
Takayuki Takasugi
Keyword(s):  
Mechanical Properties ◽  
Room Temperature ◽  
Single Phase ◽  
Tensile Ductility ◽  
Ternary Alloys ◽  
Second Phase ◽  
Intermetallic Alloys ◽  
Fine Grained ◽  
Second Phase Particles ◽  
Al Matrix

Mechanical properties of thermomechanically fabricated D03 Fe-33Al and B2 Fe-38Al intermetallic alloys containing Zr were investigated by means of tensile test and microhardness measurement. The Zr-added ternary alloys showed fine-grained microstructure containing large (Fe,Al)12Zr τ1 phase particles, while the binary alloy showed a single-phase microstructure consisted of coarse recrystallized grains. By introducing the large τ1 phase particles to Fe-Al matrix, tensile strength at room temperature as well as at high temperature (873K) was enhanced but tensile ductility at both temperatures decreased. On the other hand, it was found that vacancy hardening which was significant in the alloys with high contents of Al (i.e., Fe-38Al) was reduced by the large τ1 phase particles.

Effect of N2 Flow on Microstructure, Mechanical Properties and Oxidation Resistance of CrNx Coatings

2013 ◽  
Vol 750-752 ◽  
pp. 2117-2120
Author(s):  
Guo Zheng Nie ◽  
Chun Liang Zhong ◽  
Lan E Luo ◽  
Ren Long Zhou ◽  
Qiang Liu
Keyword(s):  
Mechanical Properties ◽  
Oxidation Resistance ◽  
Single Phase ◽  
High Hardness ◽  
Hexagonal Structure ◽  
Mixed Phase ◽  
Hard Coatings ◽  
Face Centered Cubic ◽  
Face Centered ◽  
Two Phases

A series of CrNx coatings were deposited by direct-current reactive magnetron sputtering. The microstructure, the hardness and oxidation resistance of the thin films were characterized respectively with X-ray diffraction (XRD) and nanoindentor. The effect of N2 flow on the microstructure, the hardness and oxidation resistance was studied. It was found that the CrNx film has two phases, the conformation of hcp-Cr2N (hexagonal structure) and fcc-CrN (face-centered cubic). In CrNx film phase structure, with N2 flow increasing, there is the conformation of CrNx films transition from Cr2N to Cr2N and CrN mixed phase, the final CrN single-phase. A single phase of CrNx films has very high hardness while thin film as mixed phase showed a low hardness. CrN has better oxidation resistance with the oxidation resistance temperature of 500°C to 600°C compared to Cr2N. Comparison of Cr2N and CrN on the mechanical properties and oxidation resistance, CrN has better comprehensive performance for protective hard coatings.

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