Effects of 4 GPa Pressure Heat Treatment on Microstructure and Micro-Mechanical Properties of LC4 Aluminum Alloy

Abstract

Microstructure and micro-mechanical properties of LC4 aluminum alloy were studied before and after treating the samples at 4 GPa pressure. The hardness, elastic modulus and plastic deformation were measured by nanoindenter and the microstructure of the LC4 aluminum alloy was observed by metalloscope and scanning electron microscope. The results show that the microstructure of the LC4 aluminum alloy can be refined and compacted after 4 GPa pressure treatment. The micro-mechanical properties of LC4 aluminum alloy can be improved effectively.

Effect of Cryogenic Treatment on Creep Resistance of Cu-11.74Al-0.38Ni Alloy

“…According to reports in the literature of recent year [3][4], cryogenic treatment can improve the mechanical properties of copper alloy and thermal physical properties, But the report on the room temperature creep properties of copper alloy by cryogenic treatment a little.The room temperature creep properties of copper alloy directly influences its service life, and the use of the traditional test method of uniaxial tensile is hard to measure the room temperature creep properties of materials [5]. Nano indentation test system has a very high load and displacement resolution, and it is not restricted by sample shape and size, it is an effective means of measuring room temperature micro mechanical properties of materials [6][7]. Therefore, in this paper, the nano indentation method is adopted to study the cryogenic treatment on oom temperature creep resistance of Cu-11.74-Al-0.38-Ni alloy.…”