Identidade, aceitação e lutas em Bless me, Ultima de Rudolfo Anaya

O romance Bless me, Ultima de Rudolfo Anaya, um dos precursores da Literatura Chicana, traz os conflitos vividos pelos chicanos na sua luta por inclusão e identidade na sociedade norte-americana. Para entender tais lutas, precisamos primeiramente entender o panorama histórico e sociocultural no qual a obra esta inserida e identificar alguns fenômenos culturais e aspectos ideológicos envolvidos. Este estudo será embasado em pressupostos dos Estudos Culturais, levando em consideração fatores como aceitação social, busca por identidade, barreiras raciais e preconceito social. O trabalho também analisa alguns aspectos referentes à maneira na qual a Literatura Chicana está promovendo modificações e inclusões no cânone, na tradição literária, lançando um novo olhar sobre a tradição literária vigente. Anaya traz em sua obra um dos pontos cruciais para esse movimento de afirmação da literatura produzida por hifenados, identificando e pontuando alguns elementos que possam traçar o surgimento e o desenvolvimento de uma literatura própria aos chicanos e entender como a forma dos conflitos sociais se sedimenta na própria forma do romance. É essencial estudar a produção literária de grupos que ficaram por muito tempo à margem da literatura norte-americana, tratando de temas que envolvem outra perspectiva, confrontando a cultura de hegemonia branca e dominante, com uma estória sendo contada do ponto de vista do colonizador. Problematizar, tentar entender um pouco mais sobre as lutas, vitórias e derrotas traduzidas em literatura que os autores chicanos, em especial Rudolfo Anaya em sua obra Bless me, Ultima, trazem ao leitor

Development of a high strength Al-Mg2Si-Mg-Zn based alloy for high pressure die casting

A high strength Al-Mg2Si-Mg-Zn based alloy has been developed for the application in high pressure die casting to provide improved mechanical properties. The effect of various alloying elements on the microstructure and mechanical properties including yield strength, ultimate tensile strength and elongation of the alloy was investigated under the as-cast and heat-treated conditions. The typical composition of the high strength alloy has been optimised to be Al-8.0wt%Mg2Si-6.0wt%Mg-3.5wt%Zn-0.6wt%Mn (Al-11.0wt%Mg-2.9wt%Si-3.5wt%Zn-0.6wt%Mn) with unavoidable trace impurities. The mechanical properties of the alloy were enhanced by a quick solution treatment followed by ageing treatment. The improved tensile properties were at a level of yield strength over 300MPa, the ultimate tensile strength over 420MPa and the elongation over 3% assessed using international standard tensile samples made by high pressure die casting. The microstructure of the die-cast alloy consisted of the primary α-Al phase, Al-Mg2Si eutectics, AlMgZn intermetallics and α-AlFeMnSi intermetallics under the as-cast condition. The AlMgZn intermetallic compound was dissolved into the Al-matrix during solution treatment and subsequently precipitated during ageing treatment for providing the effective improvement of the mechanical properties.The financial support is gratefully acknowledged for the Engineering and Physical Sciences Research Council (EPSRC) (Project number: EP/I038616/1), Technology Strategy Board (TSB) (Project number: 101172) and Jaguar Land Rover (JLR), United Kingdom

Investigation of influence of parameters of laser welding on microstructure and mechanical properties of Al-4.7%Mg -0.32%Mn-0.21%Sc-0.09%Zr alloy

В работе исследовано влияние пиковой мощности (0,64–1,31 кВт) при напряжениях из диапазона 330–430 В при лазерной сварке со стандартным диаметром пучка и длительностью импульса 8 мс. Изучена микроструктура, сформированная сваркой. Установлено, что существует разноообразие в размерах и форме зерен в зоне шва. Показано, что с увеличением пиковой мощности ширина и глубина области шва увеличивается.In the present work the influence of peak power of laser beam welding were studied at voltage range from 330 to 430 V and peak power (0,64; 0,75; 0,87; 1,01; 1,15; 1,31) kW , and laser beam diameter is standard and duration 8 ms. The microstructure after welding was studied. It was concluded that there is a variant in grain size and shape in the welded zone and pre-welded area. The dimensions of welded zone was measured. From measuring data, it was observed, that as increasing the peak power the width and depth of welding increased.The work was performed as part of the state work "Carrying out of research work (basic research, applied research and experimental development)" state task MES of Russia in the sphere of scientific activities 2014–2016. (Task № 2014/113)

РАСЧЕТ ФАЗОВЫХ ДИАГРАММ СИСТЕМ Al–Cu–Zn–Mg и Al–Cu–Zn–Mg–Fe–Si

Using the results of thermodynamic calculations with «Thermo-Сalc» software package, the fragments of the Al–Cu–Zn–Mg and Al–Cu–Zn–Mg–Fe–Si– (Mn) phase diagrams in the range of densities, (%): 4–6 Сu, 2–4 Zn, 0,5–2,0 Mg, 1,5–2,0 Fe, 1,5–5,0 Si have been built as well as the composition of the solid solution for a number of alloys of the Al–Cu–Zn–Mg–Fe–Si–(Mn) system has been calculated at temperatures near to the solidus line. The X-ray microspectral analysis was used for experimental proof of the thermodynamic calculations, which show the satisfactory precision of the calculated and experimental data. It is found that maximally alloyed aluminum solid solution can be produced at an iron and silicon density ratio of Fe/Si = 0,5 for the alloys of the Al–Cu–Zn–Mg–Fe–Si–(Mn) system.По результатам термодинамических расчетов с использованием пакета программ «Thermo-Сalc» построены фрагменты фазовых диаграмм Al–Cu–Zn–Mg и Al–Cu–Zn–Mg–Fe–Si–(Mn) в интервале концентраций (%) 4–6 Сu, 2–4 Zn, 0,5–2,0 Mg, 1,5–2,0 Fe, 1,5–5,0 Si, а также рассчитан состав твердого раствора для ряда сплавов системы Al–Cu–Zn–Mg–Fe–Si–(Mn) при температурах вблизи солидуса. Методом микрорентгеноспектрального анализа проведена экспериментальная проверка термодинамических расчетов, которая показала удовлетворительную сходимость расчетных и экспериментальных данных. Выявлено, что при соотношении концентраций железа и кремния Fe/Si = 0,5 для сплавов системы Al–Cu–Zn–Mg–Fe–Si–(Mn) возможно получение максимально легированного алюминиевого твердого раствора

Insight into the partial solutionisation of a high pressure die-cast Al-Mg-Zn-Si alloy for mechanical property enhancement

Engineering and Physical Sciences Research Council, United Kingdom; National Natural Science Foundation of China; Natural Science Basic Research Plan in Shaanxi Province of Chin

INVESTIGATION OF CRYSTALLOGRAPHIC FEATURES IN BAINITEMARTENSITE STRUCTURES AFTER DIFFERENT QUENCHING CONDITIONS BY MEANS OF EBSD-ANALYSIS

Методом EBSD-анализа исследовали влияние температуры закалки на кристаллографические особенности бейнитно-мартенситной структуры образцов из высокопрочной низкоуглеродистой стали. Показано, что закалка с более высокой температуры снижает долю большеугловых границ, но практически не меняет спектр межвариантных разориентировок. В то же время этот спектр заметно изменяется с повышением скорости охлаждения, что обусловлено ростом доли мартенситной составляющей.The influence of quenching temperature on crystallographic features in bainite-martensite structure of high strength low alloyed steel is under research. Higher quenching temperature decreases high-angle boundaries fraction whereas intervariant misorientations distribution are invariable. At the same time the intervariant misorientations distribution alters significantly at increasing cooling rate due to martensite fraction increase.Работа выполнена при финансовой поддержке государства в лице Минобрнауки в рамках соглашения № 14.595.21.0004