An investigation was conducted on Al-4%Cu alloy sheets to study the role of deformation path on the strength properties, evolution of microstructure and crystallographic texture during cryogenic rolling. Samples were rolled to two distinct thickness strains (50% and 75%) by unidirectional and cross rolling (bidirectional) routes. The strength and hardness properties were found to be more efficient in the cross rolled samples at 50% reduction than their counterparts rolled unidirectionally. Dynamic recovery was observed at higher rolling reductions on cross rolling. Microscopic features observed by EBSD revealed the occurrence of significant grain refinement on the samples rolled with a change of strain path. Also, the alteration of the rolling route resulted in distinct deformation textures and microstructures. TEM studies pointed out the scattered diffusion of the disintegrated dislocation cores and the redistribution of the second phase particles on higher rolling reductions with the change of strain path. Furthermore, the texture results showed a threefold increase on the Goss/Brass ratio which indicated the good fracture toughness behaviour of the cross rolled samples at lower reductions.
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This paper aims to explore the effects of chief executive officer (CEO) characteristics on managerial risk-taking behaviour and the moderating impact of audit committee (AC) ownership and ethnicity in this relationship. The underlining theory employed in this study is the upper echelons theory (UET). Data were hand-collected from annual reports of the top 100 Malaysian PLCs over 2015-2020 and were analysed through multiple regression analysis and Hayes' process moderation analysis. The findings suggest that CEO age negatively affects risk-taking. The results, however, do not support the use of CEO tenure and gender as proxies for managerial risk-taking behaviour. AC ownership has a significant positive moderating effect on the relationship between CEO age, tenure, gender and risk-taking. Contrarily, AC ethnicity only significantly moderates the association between CEO gender and risk-taking. This study further adds to the existing literature considering these independent variables. Implications for Central European audience: This study serves as a good yardstick for exploring the effects of CEOs' characteristics. While this study is within the Malaysian context, it is undoubtedly useful in the Central European context. Risk-taking behaviour can be dispersed over all sectors, especially as this study employs the UET theory. The findings would set a comparison for corporations in Central European countries.
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