Effects of Different Heat Treatment on Microstructure, Mechanical and Conductive Properties of Continuous Rheo-Extruded Al-0.9Si-0.6Mg (wt%) Alloy

Abstract

Al-0.9Si-0.6Mg (wt%) alloy conductive wires were designed and produced by continuous rheo-extrusion process. The effects of different heat treatment on microstructure, mechanical and conductive properties of the wires were studied. Results show that, after T6 heat treatment, conductive property of the alloy increased while elongation decreased with the higher aging temperature and longer aging time. After T8 and T9 heat treatment, acicular strengthening phase β''-Mg2Si homogeneously precipitated, which effectively improved mechanical and conductive property of the alloy. The tensile strength, elongation and resistivity of T8 heat treated alloy reached 336 MPa, 13.7% and 29.3 nΩm respectively. After T9 heat treatment, the alloy's tensile strength, elongation and resistivity was 338 MPa, 6.0% and 30.2 nΩ·m respectively.

Wear resistant aluminum alloy - B4C composites fabricated by rheo-casting and rolling process

“…Although many efforts have been made to enhance the mechanical performance of B 4 C composites, the fabrication methods still need to improve to establish solid bonding between B 4 C particles and aluminum matrix. Compared with traditional processing methods, semisolid slurring and rheological forming method can effective homogenize the microstructure by reducing dendrites [24]. Grains could be fully refined and spheroidized during the process while agglomeration is also reduced.…”

Properties Evaluation of Thin Microhardened Surface Layer of Tool Steel after Wire EDM

“…Micro-cracks or other disintegrations were not observed on the surface or in the sub-surface layer. This is attributed to proper preparation of the samples using heat treatment [27] in combination with favorable electric and heat conductivities (G = 1.54 S¨m´1¨mm´2; λ t = 30 W¨m´1¨K´1) of the applied steel EN X210Cr12. Figure 2 shows allocation of particular sub-surface layers of untreated eroded sample surface observed by the digital microscope Keyence VK-X150 (Keyence International, Mechelen, Belgium) at 1000ˆmagnification where structural changes occur in the terms that represent technological parameters setting for roughing operations.…”

“…Micro-cracks or other disintegrations were not observed on the surface or in the sub-surface layer. This is attributed to proper preparation of the samples using heat treatment [27] Layer No. 1 is characterized by burn-erosion and is created by metal remnants from the tool-brass Ms63 wire electrode.…”

Casting Alloy Design and Modification

“…New processes are also entering the manufacturing scene affording new possibilities to create novel microstructures and thereby also new types of property combinations [6,7]. The introduction of new processes also shifts the boundary between processes that used to be made in fully solid state and now move towards casting and more liquid processing resulting in hybrid processes [6][7][8]. Independent of this, post treatment processes for bulk and surface properties are still needed to be used together with the novel processing property capability [8,9].…”

“…The introduction of new processes also shifts the boundary between processes that used to be made in fully solid state and now move towards casting and more liquid processing resulting in hybrid processes [6][7][8]. Independent of this, post treatment processes for bulk and surface properties are still needed to be used together with the novel processing property capability [8,9]. Last but not least, it is also critical to understand the application in which the part is to be used and its implications for the stability of its properties [10].…”