The heat treatment cycles that are currently applied to semi-solid processed components are mostly those that are in use for dendritic casting alloys. These heat treatments are not necessarily the optimum treatments. It is shown that a decrease of the solution treatment time at 540 o C from 6 hours to 1 hour does not alter the T4 or T6 tensile properties of the SSM processed A356 alloy. Slightl...

Water-soluble metal working fluids are used for processing of aluminum alloy materials. This short article describes properties of new additives in water-soluble metal working fluids for aluminum alloy materials. Many half esters or diesters were prepared from the reactions of higher alcohols with acid anhydrides. Interestingly, diesters of PTMG (tetrahydrofuran oligomer, MW = 650 and 1000) and...

Long-leg bracing affords ambulatory potential and helps reduce the incidence of deformity in patients with paralysis or weakness caused by lesions of the spinal cord. The conventional long-leg brace or knee-ankle orthosis (KAO) consists of double metal uprights, drop locks or bail locks at the knee, double action ankle joints with anterior and posterior pin stops, metal stirrup, and steel shank...

Compared with the conventional manufacturing of aluminum sheet metal, the forming of so called Tailored Heat Treated Blanks (THTB) enables the production of complex aluminum sheet metal parts [1], [2]. The reasons for the lower forming behavior of aluminum alloys are well founded in the material properties. Especially smaller values for uniform elongation (< 30 %) and vertical anisotropy (< 1) ...

This paper studies the plastic deformation of a rotating disk made aluminum dispersion-hardened alloys using mechanical tensile tests and structured study optical microscopy methods. Alloys such as AA5056 A356 with dispersed Al3Er TiB2 particles are used initial materials. Tensile strength testing obtained shows that addition in alloy composition leads to an increase its ultimate stress limit (...

The slow compressional wave in air-saturated aluminum foams was studied by means of ultrasonic transverse transmission method over a frequency range from 0.2 MHz to 0.8 MHz. The samples investigated have three different cell sizes or pores per inch (5, 10 and 20 ppi) and each size has three aluminum volume fractions (5%, 8% and 12% AVF). Phase velocities show minor dispersion at low frequencies...

High-density aluminum foam can provide higher stiffness and absorb more energy during the impact Obtaining constitutive law of such requires tri-axial tests with very high pressure, where difficulty may arise because hydrostatic pressure reach than 30 MPa. In this paper, instead using tests, we proposed three easier tests—tension, compression shear to obtain parameters model (the Deshpande–Flec...

The impact toughness of closed-cell aluminum foam with various densities was investigated using Charpy impact. load history revealed an elastic region followed by a rapid drop region. peak and increase exponentially density. power exponents for the test are greater than that compressive test. Fracture analysis indicated mixed-rupture mode quasi-cleavage small shallow dimples. It can be attribut...