Effect of casting conditions on microstructure and mechanical properties of high-strength Zr73.5Nb9Cu7Ni1Al9.5 in situ composites

2003 ◽  
Vol 49 (12) ◽  
pp. 1189-1195 ◽  
Author(s):  
J. Das ◽  
A. Güth ◽  
H.-J. Klauß ◽  
C. Mickel ◽  
W. Löser ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Strength ◽  
In Situ Composites ◽  
Microstructure And Mechanical Properties

scholarly journals Influence of Heat Treatments on Microstructure and Mechanical Properties of Ti–26Nb Alloy Elaborated In Situ by Laser Additive Manufacturing with Ti and Nb Mixed Powder

Materials ◽  
2018 ◽  
Vol 12 (1) ◽  
pp. 61 ◽  
Author(s):  
Jing Wei ◽  
Hongji Sun ◽  
Dechuang Zhang ◽  
Lunjun Gong ◽  
Jianguo Lin ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Additive Manufacturing ◽  
Annealing Temperature ◽  
Annealing Treatment ◽  
High Strength ◽  
Fiber Texture ◽  
Laser Additive Manufacturing ◽  
Mixed Powder ◽  
Microstructure And Mechanical Properties

In the present work, a Ti–26Nb alloy was elaborated in situ by laser additive manufacturing (LAM) with Ti and Nb mixed powders. The alloys were annealed at temperatures ranging from 650 °C to 925 °C, and the effects of the annealing temperature on the microstructure and mechanical properties were investigated. It has been found that the microstructure of the as-deposited alloy obtained in the present conditions is characterized by columnar prior β grains with a relatively strong <001> fiber texture in the build direction. The as-deposited alloy exhibits extremely high strength, and its ultimate tensile strength and yield strength are about 799 MPa and 768 MPa, respectively. The annealing temperature has significant effects on the microstructure and mechanical properties of the alloys. Annealing treatment can promote the dissolution of unmelted Nb particles and eliminate the micro-segregation of Nb at the elliptical-shaped grain boundaries, while increasing the grain size of the alloy. With an increase in annealing temperature, the strength of the alloy decreases but the ductility increases. The alloy annealed at 850 °C exhibits a balance of strength and ductility.

A Study on Mechanical Properties and Strengthening Mechanisms of AA5052/ZrB2 In Situ Composites

2016 ◽  
Vol 139 (1) ◽  
Author(s):  
Narendra Kumar ◽  
Gaurav Gautam ◽  
Rakesh Kumar Gautam ◽  
Anita Mohan ◽  
Sunil Mohan
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
High Strength ◽  
Strengthening Mechanism ◽  
Strengthening Mechanisms ◽  
In Situ Composites ◽  
Solid Solution Strengthening ◽  
Theoretical Yield ◽  
The Matrix

In the present study, in situ reaction technique has been employed to prepare AA5052 matrix composites reinforced with different vol. % of ZrB2 particles (i.e., 0, 4.5, and 9 vol. %). Composites have been characterized by X-ray diffraction (XRD) to confirm the in situ formation of ZrB2 particles in the matrix. Optical Microscopy (OM) studies reveal the refinement of aluminum-rich phase due to the presence of ZrB2 particles. Scanning electron microscopy (SEM) studies reveal size and distribution of ZrB2 particles while transmission electron microscopy (TEM) reveals the presence of dislocations in the matrix around ZrB2 particles. Hardness and tensile testing of composites have been carried out at room temperature to evaluate the mechanical properties. The results reveal the improvement in hardness and strength with increased amount of ZrB2 particles. Strength of AA5052/ZrB2 in situ composites has been analyzed by various strengthening mechanism models. The analysis revealed that Orowan and Solid solution strengthening mechanisms are the predominant mechanism for high strength composites. Theoretical yield strength is about 6–10% higher than the experimental values due to clustering tendency of ZrB2 particles.

Microstructure and mechanical properties of Al-TiB2/TiC in situ composites improved via hot rolling

2017 ◽  
Vol 27 (12) ◽  
pp. 2548-2554 ◽  
Author(s):  
Jin-feng NIE ◽  
Fang WANG ◽  
Yu-sheng LI ◽  
Yan-fang LIU ◽  
Xiang-fa LIU ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Hot Rolling ◽  
In Situ Composites ◽  
Microstructure And Mechanical Properties
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