Workability studies on Al+2.5%TiO2+Gr powder metallurgy composites during cold upsetting

Abstract

Al+2.5%TiO 2 +Gr composites were synthesized through powder metallurgy technique and their workability behavior has been studied under tri-axial stress state condition. The powders were compacted using suitable punch and die in 400 kN hydraulic press and sintered at a temperature of about 590 °C for a period of 3 hours in an electric muffle furnace. The sintered preforms were characterized by XRD and SEM analysis. Then the preforms were subjected to incremental compressive loading of 10 kN until the cracks found at the free surface. The true axial stress (s z ), true hoop stress (s ө ), true hydrostatic stress (s m ) true effective stress (s eff ), formability stress index (β) and stress ratio parameters [(s z /s eff ), (s m /s eff ), (s ө /s eff )] were calculated for all the preforms and these are correlated with the true axial strain (e z ). It is inferred that, the addition of TiO 2 and Gr to the Al matrix material increases the stress ratio parameters and formability stress index (β). A hardness test was also conducted for sintered and cold forged preforms and results are reported.

Evaluation on Powder Metallurgy Process Parameters of Ball-Milled AA8079-B4C Nanostructured Composites via Taguchi Grey Relational Analysis

“…The SEM image of the produced AA8079 and as received B 4 C is displayed in Figures 2(a Figure 3 shows the details of fabrication of ball milled aluminium alloy and its composites. The needed amount of elemental powders was exactly weighted by utilizing an electronic weight balance machine to produce the composition, AA8079, AA8079-5%B 4 C, AA8079-10%B 4 C, and AA8079-15%B 4 C and ball milled via high energy ball mill for 10 h [22]. The drum speed maintained was 100 rpm [23].…”

Synthesis of Metal Matrix Composites via Powder Metallurgy Route: a Review

“…Blending is the method in which powders of the equal minimal composition but having various particle sizes and shapes are combined. To achieve homogenous distribution of particle sizes and to reduce the porosity blending should be done [4,10].…”

“…Dissimilar varieties of ceramic materials are widely used to reinforce into aluminium alloy matrixes due to their behaviors such as refractoriness, high hardness, wear resistance, etc [3]. Components with challenging dimension and high strength components can be easily manufactured by the P/M method [4]. By following, the powder metallurgy manufacturing route magnesium matrix composites are being fabricated successively in a simple and cost effective manner [5].…”

Characterization and Properties of Mg–TiO$_2$ Composites Produced $via$ Ball Milling and Powder Metallurgy

“…Composite materials are promising essentially in response to the exceptional demands of technology due to rapidly advancing activities in aircrafts, aerospace and automotive industries [1]. These materials have low specific gravity that makes their properties, particularly superior in strength and modulus to many traditional engineering materials such as metals [2]. As a result of intensive studies into the fundamental nature of materials and better understanding of their structure property relationship, it has become possible to develop new composite materials with improved physical and mechanical properties.…”