GPS Safety Tracking Device: Technical Report

The scope of this particular project is to develop a device which will allow real time location tracking through a mobile application using GPS technology. Its aim is to make people’s life easier through achieving the ‘attach-and-locate’ any belongings in seconds. The location tracking is achieved by obtaining the satellites’ data using GPS technology. This is accomplished by a connection of a RaspberryPi and a GPS Module. The corresponding mobile app will constantly update the registered devices’ current location, distance between the device and the defined safety-zone, as well as the alarm status; It not only allows user to define custom ‘safety zone’ and trigger alarm when the devices enter/leave the area; and also allows remote LED/buzzer controlling through the mobile application for a safety purpose

Microstructure, Mechanical Properties, And Electrochemical Behavior Of Ti-nb-fe Alloys Applied As Biomaterials

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)New beta metastable Ti alloys based on Ti-30Nb alloy with the addition of 1, 3, or 5 wt pct Fe have been developed using the bond order and the metal d-orbital energy level () design theory. The samples were prepared by arc melting, hot working, and solution heat treatment above the beta transus followed by water quenching (WQ) or furnace cooling (FC). The effect of the cooling rate on the microstructure of Ti-30Nb-3Fe wt pct was investigated in detail using a modified Jominy end quench test. The results show that Fe acts as a strong beta-stabilizing alloying element. The addition of Fe also leads to a reduction in the omega and alpha phases volumetric fractions, although the omega phase was still detected in the WQ Ti-30Nb-5Fe samples, as shown by TEM, and alpha phase clusters were detected by SEM in the FC Ti-30Nb-3Fe samples. Among the WQ samples, the addition of 5 wt pct Fe improves the ultimate tensile strength (from 601 to 689 MPa), reduces the final elongation (from 28 to 16 pct), and impairs the electrochemical corrosion resistance, as evaluated by potentiodynamic polarization tests in Ringer's solution. The microstructural variation arising from the addition of Fe did not change the elastic modulus (approximately 80 GPa for all experimental WQ samples). This study shows that small Fe additions can tailor the microstructure of Ti-Nb alloys, modifying alpha and omega phase precipitation and improving mechanical strength.4732133226FAPESP (Sao Paulo Research Foundation)CNPq (National Council for Scientific and Technological Development)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq

Effects of double aging heat treatment on the microstructure, Vickers hardness and elastic modulus of Ti-Nb alloys

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Aging heat treatment can be a good way to optimize mechanical properties, changing the microstructure, and hence, the mechanical behavior of Ti alloys. The effects of aging heat treatments on beta-type Ti-30Nb alloy were investigated to evaluate the kinetics of alpha '' -> alpha + beta transformation. The results obtained from differential scanning calorimetry and high-temperature X-ray diffraction experiments indicated the complete decomposition of orthorhombic alpha '' phase at close to 300 degrees C, followed by a phase precipitation at 470 degrees C. The aging heat treatments also enabled us to observe a transformation sequence alpha '' -> beta + omega -> beta + omega + alpha, indicating martensite decomposition and omega phase precipitation at 260 degrees C after 2 h, followed by a phase nucleation after heating at 400 degrees C for 1 h. The elastic modulus and Vickers hardness of Ti-30Nb alloy were found to be very sensitive to the microstructural changes caused by heat treatment. (C) 2011 Elsevier Inc. All rights reserved.627673680Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq

Effects of the microstructural characteristics of a metastable beta Ti alloy on its corrosion fatigue properties

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)In the field of biomedicine, preventing the corrosion fatigue of metallic biomaterials for use in hard tissue replacement implants is of paramount importance. Corrosion fatigue of implants is caused by their contact with body fluids, as well as cyclic stresses resulting from body movements. The metallic biomaterials most widely used today are titanium alloys. It is a well known fact that the mechanical behavior of titanium alloys is determined by their chemical composition and thermomechanical processing. This study involved an evaluation of the influence of the microstructure on the corrosion fatigue of Ti-35Nb (wt.%) alloy samples in NaCl 0.9% solution. The samples were subjected to two different cooling rates from beta phase field temperatures. The distinct cooling rates resulted in microstructures composed of beta and alpha' phases (160 degrees C/s) and alpha, beta and omega phases (0.04 degrees C/s). The samples were characterized microstructurally by optical, scanning electron and transmission electron microscopy and X-ray diffraction. Their high-cycle corrosion fatigue properties were evaluated based on fatigue tests in NaCl 0.9% solution, under stresses ranging from 150 to 450 MPa. The results suggest that the furnace cooled sample showed lower corrosion fatigue. (C) 2013 Elsevier Ltd. All rights reserved.543237Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq

Correlations between aging heat treatment, omega phase precipitation and mechanical properties of a cast Ti-Nb alloy

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Ti-Nb alloys were arc melted in a water-cooled copper hearth in an inert atmosphere. After preparation, the samples were centrifugally cast in copper molds, and rapidly cooled, resulting in a martensitic microstructure. They were then aged at different temperatures. The microstructural characterization of this material suggested that martensite decomposition occurred, leading to precipitation of alpha, beta and omega phases. Aging at higher temperatures led to to phase decay. Mechanical characterization indicated that the heat treatment enhanced the strength and ductility of the alloys. Correlations between heat treatment, omega precipitation and mechanical behavior are discussed. (C) 2010 Elsevier Ltd. All rights reserved.32423872390Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq

Hexagonal martensite decomposition and phase precipitation in Ti-Cu alloys

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)The mechanical behavior of Ti-Cu alloys can be improved by controlling Ti(2)Cu precipitation. In eutectoid alloys, such precipitation can be achieved by the decomposition of martensite in response to aging heat treatment. The purpose of this work is to discuss the evolution of precipitates during the decomposition of hexagonal martensite in Ti-Cu alloys. First, samples with near-eutectoid compositions were prepared in an arc furnace equipped with a non-consumable tungsten electrode and water-cooled copper hearth under a high purity argon atmosphere. After chemical homogenization at a temperature in the beta field, the samples were water-quenched and examined by differential scanning calorimetry and high-temperature X-ray diffraction. The results indicate that rapidly quenched near-eutectoid Ti-Cu alloys present Ti(2)Cu precipitates. Regardless of the cooling rate applied, such precipitation is unavoidable. No evidence of beta phase stabilization was found in the rapidly quenched samples. Precipitation temperatures of coherent and incoherent phases of 415 degrees C and 550 degrees C, respectively, were determined from the differential scanning calorimetry measurements. Ti(2)Cu precipitation was examined in situ by high temperature X-ray diffraction experiments. The total decay of martensite was found to occur above 575 degrees C. Vickers hardness testing of aged samples revealed a correlation between phase precipitation and hardening. (C) 2011 Elsevier Ltd. All rights reserved.324189046084613Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq

Microstructure of directionally solidified Ti-Fe eutectic alloy with low interstitial and high mechanical strength

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)The performance of Ti alloys can be considerably enhanced by combining Ti and other elements, causing an eutectic transformation and thereby producing composites in situ from the liquid phase. This paper reports on the processing and characterization of a directionally solidified Ti-Fe eutectic alloy. Directional solidification at different growth rates was carried out in a setup that employs a watercooled copper crucible combined with a voltaic electric arc moving through the sample. The results obtained show that a regular fiber-like eutectic structure was produced and the interphase spacing was found to be a function of the growth rate. Mechanical properties were measured using compression, microindentation and nanoindentation tests to determine the Vickers hardness, compressive strength and elastic modulus. Directionally solidified eutectic samples presented high values of compressive strength in the range of 1844-3000 MPa and ductility between 21.6 and 25.2%. (C) 2011 Elsevier B.V. All rights reserved.33314047Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq