An Study of Nanoscale Mechanical Twins in GH4169 Alloy by Laser Shot Peening Processing

In order to study the mechanism of the fatigue strengthening using laser shot peening in GH4169 alloy, micro-structural and nanoscale mechanical twins (MT) at different depth below the top surface subjected to laser shot peening processing (LSP) were investigated by means of electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM) observations. In terms of the experimental observations and analyses, the formation of refined grains and nanoscale MT mechanism at the near surface of GH4169 alloy as a function of LSP treament can be summarized as follows: (i) two direction low density of MTs divide the initial coarse grains into submicron rhombic blocks; (ii) high density of MTs aligned in two directions subdivide the submicron rhombic blocks into nanoscale rhombic MT blocks; (iii) the third direction MT further refine the nanoscale rhombic MT blocks into nanoscale triangular MT blocks; (iv) some of subdivided blocks evolve into refined grains. An ultra-high strain rate induced by ultra-short laser pulse plays a key role in the formation of refined grains and nanoscale MT during plastic deformation of GH4169 alloy subjected to LSP treatment.

Implications of laser shot dosage on image quality in LA-ICP-QMS imaging

Higher dosages in LA-ICP-QMS imaging increases image quality; especially noticeable for low elemental concentrations, and generally dominates the slight loss in spatial resolution.

PENGARUH PENEMBAKAN LASERPUNKTUR PADA TITIK REPRODUKSI ITIK CAMPBELL (Anas platyrhynchos domesticus) BETINA TERHADAP PRODUKTIVITAS TELUR

The technology of laserpuncture in livestock is an acupuncture technique using Laser (Light Amplification by Stimulated Emission of Radiation) that is fired at acupuncture points as biological receptors that are related to organs that can provide stimulatory effects. This research was conducted in the laboratory of Airlangga University for 30 days using a sample of 18 cambell ducks divided into 3 treatments and laser shot with 3 days interval. Treatment 0 as control, treatment 1 got laser treatment dose 0,2 joule and treatment 2 got laser treatment dose 0,5 joule. On the final result of the eggs that have been in the production of duck research for 29 days. P2 given laser shootings with a dose of 0.5 joule yielded more eggs with 158 grains compared to P1 given laser shootings with a dose of 0.2 joules yielding 126 grains and P0 with inactivated laser yielding a total of 86 grains. The conclusion of this study is the shooting of laserpuncture dose of 0.2-0.5 joule can increase egg productivity