Microstructure and Characteristic of Laser Surface Alloyed Ni and Ni–Cr–B–Si on Al–Mg–Si Alloy

Abstract

A 5 KW CO 2 laser has been used to modify the surface microstructure of Al-Mg-Si aluminum alloy with pure Ni and Ni-Cr-B-Si powders. The experimental results indicate that a porosity-free zone can be generated after laser surface alloying (LSA). The Al 3 Ni particles were only observed in the LSA Ni sample. In the LSA Ni-Cr-B-Si sample, there are three regions indicated as surface region in the melt zone (region A), bottom region in the melt zone (region B), and amorphous phase in bottom region (region C) from the top to the bottom. In the region A, the Al 3 Ni particles are present and the Al 3 Ni 2 particles distributed in the region B. The partial Al-Ni-Cr amorphous structures are dispersed in the region C. And, the AlNi and Al 8 Cr 5 structures were observed in the interface of region B and C. The hardness of the LSA NiCr-B-Si sample is sharply increased than Al-matrix and Ni specimen, specifically the amorphous structure in region C is about 18 times higher than the Al-matrix.

Surface morphology and corrosion behavior of pure aluminum and its alloys in aqueous sulfuric acid medium

“…1,2 Al alloys, the nonferrous alloys that have found intensive use in a wide range of industries because of the numerous attractive properties they possess. [3][4][5][6][7] Furthermore, aluminum (Al) and its alloys are used for the automobile body plane and the vessels for hydrogen gas, even in very high-temperature applications. [8][9][10] In addition, these materials are very essential in the area of new and developing fields of sciences, especially fuel and solar cell technology, where Al as a low-work-function metal corrodes and thereby, meaninglessly lowering the assembly efficiency of the above-mentioned cells.…”

“…The unique characteristics such as light weight, high strength, recyclability, corrosion resistance, good formability given by aluminum (Al) and its alloys cause Al one of the most efficient, practical, and cost‐effective metallic materials for a wide area of operations from household to the versatile engineering fucntions 1,2 . Al alloys, the nonferrous alloys that have found intensive use in a wide range of industries because of the numerous attractive properties they possess 3‐7 . Furthermore, aluminum (Al) and its alloys are used for the automobile body plane and the vessels for hydrogen gas, even in very high‐temperature applications 8‐10 .…”

THE EFFECT OF HEAT TREATMENT ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF A356/ZrO2 NANO REINFORCED COMPOSITES

“…Aluminum and its alloy are used in many industrial applications, due to their excellent properties, such as high strength-to-weight ratios, high thermal conductivity, good corrosion properties and excellent workability [1][2][3][4][5]. The use of Al-Si-Mg alloys, in particular, is attractive to the automotive industry, due to lightweight and reasonable strength after ageing treatment [6].…”