scholarly journals The development of platinum-based alloys and their thermodynamic database

2002 ◽  
Vol 38 (3-4) ◽  
pp. 197-204 ◽  
Author(s):  
L.A. Cornish ◽  
J. Hohls ◽  
P.J. Hill ◽  
S. Prins ◽  
R. Süss ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Phase Structure ◽  
Base Composition ◽  
Alloy Composition ◽  
Quaternary Alloy ◽  
Thermodynamic Database ◽  
Ternary Alloys ◽  
Quaternary Alloys ◽  
Two Phase ◽  
Oxidation Properties

A series of quaternary platinum-based alloys have been demonstrated to exhibit the same two-phase structure as Ni-based superalloys and showed good mechanical properties. The properties of ternary alloys were a good indication that the quaternary alloys, with their better microstructure, will be even better. The quaternary alloy composition has been optimised at Pt84:Al11:Ru2:Cr3 for the best microstructure and hardness. Work has begun on establishing a thermodynamic database for Pt-Al-Ru-Cr alloys, and further work will be done to enhance the mechanical and oxidation properties of the alloys by adding small amounts of other elements to the base composition of Pt84:Al11:Ru2:Cr3.

Mechanical properties of epoxy resin/hydroxyl-terminated polyester blends: effect of two-phase structure

2005 ◽  
Vol 54 (10) ◽  
pp. 1408-1415 ◽  
Author(s):  
Yimin Liu ◽  
Weidong Zhang ◽  
Hongwei Zhou
Keyword(s):  
Mechanical Properties ◽  
Epoxy Resin ◽  
Phase Structure ◽  
Two Phase

Phase Stability of the L12 Compound and Microstructural Changes in Co-(W or Mo)-Ta Ternary Alloys

2008 ◽  
Vol 1128 ◽  
Author(s):  
Hibiki Chinen ◽  
Toshihiro Omori ◽  
Katsunari Oikawa ◽  
Ikuo Ohnuma ◽  
Ryosuke Kainuma ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Grain Boundaries ◽  
Phase Stability ◽  
Phase Structure ◽  
Lamellar Structure ◽  
Ternary Alloys ◽  
Peak Hardness ◽  
Two Phase ◽  
Transmission Electron

AbstractMicrostructural investigations of Co-5W-2.5Ta (at.%) and Co-4Mo-4.5Ta (at.%) ternary alloys were conducted. Fine coherent precipitates were observed in these alloys annealed at 800°C, and the crystal structures of precipitates (γ’) and matrix (γ) phase were identified as the L12 and A1 structure, respectively, by transmission electron microscopy. Cellular precipitation with a γ+χ(D019) lamellar structure also proceeded at grain boundaries, and the alloys aged for a longer time only showed the γ+χ two-phase microstructure instead of the γ’ phase. With aging at around 800°C, the peak hardness of these alloys with a γ+γ’ two phase structure was about 580 Hv.

Influence of Al-Content on the Microstructure and Mechanical Properties in ZrAlN Coatings

2014 ◽  
Vol 1004-1005 ◽  
pp. 778-783 ◽  
Author(s):  
Xiao Ying Zhu ◽  
Jun Du ◽  
Gui Min Liu ◽  
Xiao Hui Zheng
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Phase Structure ◽  
Cubic Phase ◽  
X Ray Diffraction ◽  
Two Phase ◽  
Al Content ◽  
Microstructure And Mechanical Properties ◽  
Transmission Electron ◽  
Indentation Methods

Zirconium aluminum nitride coatings have been deposited onto Ti-6Al-4V substrates by reactive magnetron sputtering in order to investigate the influence of Al-content on the microstructure and mechanical properties. The morphology and microstructure of the coatings were investigated by field emission scanning electron microscopy (SEM), X-ray diffraction (XRD), and transmission electron microscopy (TEM). Nanoindentation and Vicker’s indentation methods were employed to measure the hardness and toughness of the coatings, respectively. The results show that a structure of single cubic phase with twinning is formed at Al content of x ≤ 0.23, and a two-phase structure of hexagonal and cubic phase is formed at Al content of x ≥ 0.47. Hardness and toughness of the Zr1-xAlxN coatings show similar tendency with the increasing of Al-content. Both of them reach the maximum values at x=0.23 and drop to the minimum values at x=0.47, after that, they slightly increase with the increasing Al-content. The enhanced hardness and toughness achieved at x=0.23 is ascribed not only to single cubic phase structure but also to twinning structure.

A Novel Epoxy Resin Toughened by HTBN Liquid Rubber

1992 ◽  
Vol 274 ◽  
Author(s):  
Xiaozu Han ◽  
Zhankui Yun ◽  
Fenchun Guo
Keyword(s):  
Mechanical Properties ◽  
Epoxy Resin ◽  
Phase Structure ◽  
Curing Agent ◽  
Two Phase ◽  
Liquid Rubber ◽  
Sem And Tem ◽  
Amine Curing Agent ◽  
Rubber Phase ◽  
Amine Curing

ABSTRACTA novel toughened epoxy resin was obtained by using an epoxy-terminated prepolymer prepared from epoxy resin and hydroxy-terminated butadiene-acryl-onitrile copolymer (HTBN), and an amine curing agent. The cured, toughened resin has excellent mechanical properties due to the two-phase structure which was observed using SEM and TEM. When the HTBN content is 15 phr, the rubber phase separates effectively and the specimen presents a fine two-phase structure. However, when the HTBN content reaches 25 phr, the morphology appears continuous.

Mechanical Properties of Aged-TiNiPdCu High Temperature Shape Memory Alloys

2021 ◽  
Vol 875 ◽  
pp. 15-22
Author(s):  
Saif Ur Rehman ◽  
Mushtaq Khan ◽  
Aamir Nusair Khan ◽  
Liaqat Ali ◽  
Syed Imran Husain Jaffery ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Ternary Alloy ◽  
Melting Furnace ◽  
Quaternary Alloy ◽  
Vacuum Arc ◽  
Quaternary Alloys ◽  
Bright Color

High temperature ternary Ti50Ni25Pd25 and quaternary Ti50Ni20Pd25Cu5 shape memory alloys were developed in vacuum arc melting furnace using high purity constituent elements. Half numbers of samples were solution treated at 900 °C for 2 hrs and remaining were aged at 600 °C for 3 hrs. Both alloys were characterized for microstructure analysis and mechanical properties. After aging the alloys, no significant change in microstructure was observed in ternary alloy however, fine precipitates of bright color were found along the grain boundaries in quaternary alloy. The mechanical properties of ternary and quaternary alloys were found to be improved significantly. Microhardness of ternary alloy was increased by 18 Hv whereas for quaternary alloy the same property was improved by 24 Hv. Yield stress of ternary and quaternary was observed to be enhanced by 10 MPa and 9 MPa respectively. Similarly the fracture stress was observed to be increased by 9 MPa and 13.4 MPa. Conversely, the fracture strain of ternary and quaternary alloys was reduced by 0.5% and 0.35% respectively. From these results it can be established that aging at 600 °C is beneficial to improve the mechanical properties of both alloys however, quaternary alloy responded more actively as compared to ternary alloy.

Study on Mechanical Properties of EPDM/HPVC Prepared by Dynamic Vulcanization

2011 ◽  
Vol 299-300 ◽  
pp. 751-754 ◽  
Author(s):  
Bing Liang ◽  
Jie Mei Ji ◽  
Xiao Dong Hong
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
Phase Structure ◽  
Thermoplastic Elastomer ◽  
Continuous Phase ◽  
Mass Ratio ◽  
Dynamic Vulcanization ◽  
Two Phase ◽  
Excellent Mechanical Property ◽  
Aging Resistance

A thermoplastic elastomer of EPDM/HPVC with excellent properties was prepared by dynamic vulcanization. The effects of the rubber/plastics ratio, the content of plasticizer and vulcanizing agent on the mechanical properties of EPDM/HPVC were investigated in detail. Results indicate when the mass ratio of EPDM/HPVC was 30/70, CPE was 9 phr, sulfur was 0.4 phr, EPDM/HPVC had an excellent mechanical property and aging resistance. EPDM/HPVC prepared by dynamic vulcanization had a typical sea-island two phase structure in which smaller EPDM particle dispersed uniformly in the continuous phase of HPVC.

Microstructural Evolution and Mechanical Properties of Al3-based Multi-Phase Alloys

2000 ◽  
Vol 646 ◽  
Author(s):  
Seiji Miura ◽  
Juri Fujinaka ◽  
Rikiya Nino ◽  
Tetsuo Mohri
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Ternary System ◽  
Phase Region ◽  
Quaternary Alloys ◽  
Two Phase ◽  
System A ◽  
Preliminary Study ◽  
Multi Phase ◽  
Bcc Phase

ABSTRACTA preliminary study on the phase relations in Al-Mo-Ti-X quaternary systems in the vicinity of Ti-trialuminide phases is carried out with various additives X= Mn, Cr, Fe, Ni and Ag. In the Al-Mo-Ti ternary system, a bcc-phase field extends from the Ti-Mo edge to high Al region at high temperatures and it equilibrates with a DO22-Al3Ti phase containing a large amount of Mo. It is found that, by additions of X= Mn, Cr, Fe or Ni, an L12-(Al, X)3 Ti phase appears near the two-phase region composed of the DO22-Al3 Ti and bcc phases in the Al-Mo-Ti ternary system. By heat treatment at 1223 K, the bcc phase of quaternary alloys decomposes into the A15-Mo3Al, DO22, L12 and/or σ phases, and no voids are observed. The mechanical properties of these alloys are also investigated by Vickers hardness.

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