Enhancement of hardening and thermal resistance of Mg–Sn-based alloys by addition of Cu and Al

Mg–Sn-based alloys are considered as a promising precipitation-hardening system for applications at elevated temperatures, but the hardening effect is not satisfactory owing to sluggish nucleation and rapid coarsening of the major Mg₂Sn lath precipitates. In this study, Cu and Al are added to a Mg–6Sn–1Mn base alloy. The age-hardening response and the microstructures of these modified alloys have been investigated and are compared to that of the base alloy. The additional elements are found to bring several beneficial effects to the alloys for applications at elevated temperatures. Firstly, a eutectic structure consisting of strong intermetallic phases, i.e. Mg₂Cu in the Mg–6Sn–1Mn–2Cu alloy and Al_0.93Cu_1.07Mg in the Mg–6Sn–1Mn–2Cu–2Al alloy, remains stable along the grain boundaries after solution and ageing heat treatments. Secondly, the precipitate density has been increased significantly and the precipitate size has been refined remarkably during ageing at 200?°C. Moreover, the growth of the precipitates is inhibited remarkably during the over-ageing period. Therefore, the age-hardening response and over-ageing resistance are notably improved.     

La qualité de la relation leader/membre et les comportements innovants : le rôle modérateur de la résistance au changement

Researchers have proposed that high quality of supervisor–employee relationships (Basu & Green, 1997; Scott & Bruce, 1994; Sanders, Moorkamp, Torka, Groeneveld & Groeneveld, 2010) fosters innovative behaviour. Moreover, researchers have acknowledged that this relationship is not clear (Rosing, Frese & Bausch, 2011; Volmer, Spurk & Niessen, 2012). The present study aims at testing the moderating role of resistance to change in the LMX-innovative behaviour relationship. Results of a study based on 160 participants from an organization provide empirical support to this hypothesis.     

More Than Mazel? Luck and Agency in Surviving the Holocaust

The canonical explanation for how Jews survived during the Holocaust involves some form of luck. To explore and deepen an understanding of episodic moments of luck, this article presents and discusses survivor Jerry Rawicki's close calls with death during the Holocaust. The first author examines Jerry's perspective as a survivor and her own perspective as a collaborative witness to his stories, as well as how these stories fit together within the broader literature about luck and survival. She suggests possible consequences of regarding luck as the sole explanation of survival and contends that agency and luck can go hand in hand even under oppressive structural conditions, such as the Holocaust. She concludes by reflecting on why Jerry and she might understand survival differently and on the importance of considering both positions in compassionate collaborative research.     

On the capacity to suffer one's self

Problems in the establishment of the sense of a ‘psychic’ skin, in the ways described by Bick and Meltzer for example, commonly give rise to distortions in the capacity for self‐experiences as a consequence of difficulties in relation to projective and identificatory processes. These latter may acquire a markedly adhesive character as a defence against the anxieties that arise. This makes for considerable technical difficulties in an analysis. This essay addresses the nature of these problems and considers some of the ways in which they may be approached clinically.