Synthesis, phase transformation and mechanical property of SiAlON ceramics from coal gangue

Nacre is one of the most attractive biological materials for its superior mechanical property which is mainly due to the “brick-mortar” microstructure. Nacre samples are heated in N2 atmosphere at 200°C, 400°C and 600°C, separately. The microstructures of the fresh and heated samples are characterized by SEM and XRD, and the three-point bending strengths of these samples are tested by universal mechanical testing machine. TG-DSC curves are performed on the fresh nacre and the demineralized one. The results show that biopolymer plays important roles in maintaining the microstructure, toughening mechanism and the phase transformation of aragonite.

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Role of Stoichiometry on Ordering in Ni-Cr Alloys

MRS Proceedings ◽

10.1557/opl.2015.488 ◽

2015 ◽

Vol 1809 ◽

pp. 7-12 ◽

Cited By ~ 2

Author(s):

Fei Teng ◽

Julie D. Tucker

Keyword(s):

Mechanical Property ◽

Phase Transformation ◽

Binary System ◽

Nuclear Power ◽

Experimental Methods ◽

X Ray Diffraction ◽

Control Rod ◽

X Ray ◽

Reactor Pressure

ABSTRACTMechanical property degradation due to an ordering phase transformation is a concern for alloys based on the Ni-Cr binary system (e.g., 690, 625), particularly in nuclear power applications, such as stream generator tubing, reactor pressure vessel and head control rod drive mechanism penetrations, where component lifetimes can exceed 40 years. In the present research, the disorder-order phase transformation has been studied in Ni-Cr model alloys with varying stoichiometry by experimental methods. In this paper, the effect of composition on ordering is characterized via X-ray diffraction.

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THE EFFECT OF CADMIUM ON ALUMINUM COPPER MANGAN ALLOY

Science and Technology Development Journal ◽

10.32508/stdj.v13i1.2066 ◽

2010 ◽

Vol 13 (1) ◽

pp. 32-38

Author(s):

Thong Duy Nguyen ◽

Du Vinh Nguyen

Keyword(s):

Mechanical Properties ◽

Mechanical Property ◽

Phase Transformation ◽

High Temperature ◽

Aluminium Alloys ◽

Temperature Conditions ◽

Tempering Process

This paper presents the effect of Cadium in Aluminium alloys on mechanical property and phase transformation in the alloys. The Aluminium 4,8Cu 0,6Mn 0,2Ti alloys that contain between 0,150 and 0,288 Cadmium not only enhanced strength but also stabilized physical-mechanical properties. These characteristics are particularly shown on high temperature conditions. Although Cadmium does not participate in the resistance phases of the alloys, it still can maintain and dispose the vacancies in Al-Cu-Mn alloys after tempering. That's reason why Cadmium can control the precipitation of the resistance phase - CuAl2- in the tempering process.

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Effect of element partitioning and evaluation of mechanical property on the accuracy of thermal stress analysis accompanied with phase transformation.

Journal of the Society of Materials Science Japan ◽

10.2472/jsms.37.1153 ◽

1988 ◽

Vol 37 (421) ◽

pp. 1153-1159

Author(s):

Toshihiko ARIYOSHI ◽

Hiroshi SIGEFUJI

Keyword(s):

Mechanical Property ◽

Phase Transformation ◽

Thermal Stress ◽

Stress Analysis ◽

Thermal Stress Analysis ◽

Element Partitioning

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Effect of Calcined Coal Gangue on the Mechanical Property and Microstructure of Magnesium Phosphate Cement

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.174-177.943 ◽

2012 ◽

Vol 174-177 ◽

pp. 943-946 ◽

Cited By ~ 3

Author(s):

Lei Hou ◽

Jin Hong Li ◽

Ling Xin Tong ◽

Qi Zhang

Keyword(s):

Mechanical Property ◽

Raw Materials ◽

Setting Time ◽

Ammonium Phosphate ◽

Coal Gangue ◽

Magnesium Phosphate ◽

Cement Matrix ◽

Hydration Reaction ◽

Result Show ◽

Long Time

Calcined coal gangue was used as active addition of magnesium phosphate cement (MPC). Influence of calcined coal gangue addition on the setting time, mechanical property, mineral phase, and microstructure of MPC had been studied. The prescription was designed as following: the ratio of mono ammonium phosphate to magnesia was 0.25 in mass, additive amount of calcined coal gangue was 0%, 10%, 20%, 30%, 40% to the total mass of magnesia and mono ammonium phosphate respectively, borax additive amount was 0.06 to other raw materials. The result show that calcined coal gangue could extend the final setting time and improve the early strength of MPC. The MPC obtained its maximum compressive strength of 94.9 MPa and 95 MPa with the calcined coal guage content is 0% and 10% respectively. The particles of calcined coal gangue powder filled in the voids of cement matrix as framework and had effect on microstructure. Furthermore, calcined coal guage might participate the hydration reaction in a long age and form a cementing product which result in improvement of MPC’s long time strength.

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Microstructure, phase transformation and mechanical property of Nb-doped Ni–Mn–Ga alloys

Intermetallics ◽

10.1016/j.intermet.2015.04.015 ◽

2015 ◽

Vol 64 ◽

pp. 37-43 ◽

Cited By ~ 6

Author(s):

B. Tian ◽

R. Ji ◽

Y.X. Tong ◽

L. Li ◽

Y.F. Zheng

Keyword(s):

Mechanical Property ◽

Phase Transformation

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Massive Phase Transformation as a New Prospective on Microstructural Design in a Titanium Alloy - A Review

Materials Science Forum ◽

10.4028/www.scientific.net/msf.1000.428 ◽

2020 ◽

Vol 1000 ◽

pp. 428-435

Author(s):

Eung Ryul Baek ◽

Ghozali Suprobo

Keyword(s):

Mechanical Property ◽

Titanium Alloy ◽

Phase Transformation ◽

Martensitic Transformation ◽

Massive Transformation ◽

Ti Alloy ◽

Α Phase ◽

Massive Phase ◽

Microstructural Design ◽

And Diffusion

Microstructural design is generally applied to improve the mechanical property of titanium alloy by introducing different phase transformations and thermomechanical treatments. Aside from the martensitic and diffusion transformation, the occurrence of massive transformation occurs in Ti alloy. Massive transformation is categorized as civilian phase transformation, which resulted in the change of crystal structure of an alloy with a given composition without changing the chemical composition of its initial phase. It happened when the body centered-cubic β phase changed into hexagonal closed-pack α phase without decomposing into α+β. Massive transformation involves a diffusion and growth mechanism in a short-range and generally occurs during the introduction of high cooling rates to restrict the full diffusion mechanism. Owing to the nature of a rapid cooling rate as a requirement for massive transformation, the massive phase is normally found together with the product of martensitic transformation. On the other hand, the product of massive transformation is observed as a blocky grain with a featureless characteristic using optical microscopy and. Phase identification using electron backscattered diffraction shows that the region of αm shows only the presence of the α phase. It was reported for containing a high dislocation density similar to martensitic transformation. Specifically, in Ti alloy, the higher magnification using scanning electron microscopy shows fine sub-lamellar morphology, which observed as a combination product morphology between martensitic and diffusion transformation. It resulted in the mechanical property of the massive phase is between those two morphologies. Hence, it brings a new perspective on designing the microstructure of Ti alloy, which can be used to improve the mechanical property of Ti alloy.

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