Effect of Ti-B Grain Refiner on Microstructure and Mechanical Properties of a New Super High Strength Aluminum Al-Cu-Mg-Zn Cast Alloy

2015 ◽  
Keyword(s):  
Mechanical Properties ◽  
Cast Alloy ◽  
High Strength ◽  
Grain Refiner ◽  
Microstructure And Mechanical Properties

EVOLUTION OF MICROSTRUCTURE AND MECHANICAL PROPERTIES OF THE Ni-25Al-27.5Fe-1.0Nb INTERMETALLIC ALLOY AFTER THERMAL MECHANICAL TREATMENT

2009 ◽  
Vol 23 (06n07) ◽  
pp. 1053-1059
Author(s):  
CHIH-CHIANG FU ◽  
JASON SHIAN-CHING JANG ◽  
HAN-CHANG TSAI ◽  
TSUNG-HSIUNG LI
Keyword(s):  
Mechanical Properties ◽  
Strain Rate ◽  
Mechanical Treatment ◽  
Room Temperature ◽  
Cast Alloy ◽  
High Strength ◽  
Intermetallic Alloy ◽  
Dendritic Microstructure ◽  
Microstructure And Mechanical Properties ◽  
Evolution Of Microstructure

The evolution of microstructure and mechanical properties of the Ni -25 Al -27.5 Fe -1.0 Nb intermetallic alloy after thermal mechanical treatment (TMT) was systematically investigated by means of X-ray diffractometry (XRD), scanning electron microscopy (SEM) with electron dispersive spectrum (EDS) capability, and atmosphere-controlled tensile test at room temperature with different strain rate. The results of XRD reveals that a matrix of β' phase [( Ni , Fe ) Al type ordered bcc structure] and a precipitated γ phase ( Ni 3 Fe fcc solid solution) co-exist in this alloy after TMT. The dendritic microstructure of the as-cast alloy was eliminated after TMT process. In parallel, a refined and homogeneous distributed lath precipitates can be obtained after annealing at 820 for 4 hr. Additionally, this alloy presents a relative high strength as well as ductile mechanical behavior (UTS~1320 MPa and ε~8%, respectively) at room temperature in air. A 30% improvement in yield strength is suggested to be contributed by the refined microstructure from the TMT. Moreover, the tensile strength and ductility of this alloy exhibit insensitive response with respect to the loading strain rate at room temperature.

Fabrication, microstructure, and mechanical properties of high strength cobalt sub-micron structures

2012 ◽  
Vol 552 ◽  
pp. 104-111 ◽  
Author(s):  
Sumin Jin ◽  
Michael J. Burek ◽  
Robert D. Evans ◽  
Zeinab Jahed ◽  
Michael C. Leung ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Strength ◽  
Microstructure And Mechanical Properties
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