Scripta Metallurgica Et Materialia 

About: Scripta Metallurgica Et Materialia is an academic journal. The journal publishes majorly in the area(s): Alloy & Grain boundary. It has an ISSN identifier of 0956-716X. Over the lifetime, 3497 publications have been published receiving 57229 citations.

The development of new ferromagnetic shape memory alloys in Ni-Mn-Ga system

Abstract: The Ferromagnetic Heusler alloy Ni$AnGa is known to undergo a structural phase transformation of marten&c type. Thermoelastic nature, shape memory effect @ME) and superelasticity were found in (1) to be intrinsic to this transformation. Hence the martensitic transformation (MT) in NiwGa appeared to be a subject of further intensive investigations last few years. It tumcd out that the Ni&lnGa alloy was an affluent object to search ftx new phenomena such as magnetoelastic behavior in the vicinity of MT (2) and martensite lattice softening while approaching the intermartensitic transformation temperature during heating (3). In fact all the data published before were obtained using two Ni&lnGa samples of near stoichiometric composition. Despite the small composition difference the two mentioned Ni&lnGa alloys (alloys 3 and 10 in Table 1) studid e.g. in (Z!, 3), possess entirely Werent martensitic temperatures, Iv&. So, the high sensitivity of M. to the deviation ILi-om the stoichiometric composition can be drawn as an important conclusion. In this work we present the results of the investigation of the following problems: how M,, the thermal hysteresis, Curie temperature, transformation heat are a&&d by the composition variation in the Ni-Mn-Ga alloy system in a concentration interval for each component of about 10 at. %. This work was performed to make sure that lhe new family of Ni-Mn-Ga based shape memory alloys @MA) with a wide variety of structural and magnetic properties is actually elaborated.

Tensile-compressive yield asymmetries in high strength wrought magnesium alloys

Abstract: Owing to magnesium's very low density (of 17 g/cm[sup 3]) there is potential for producing Mg alloys with higher specific strengths than those of existing aluminium alloys for applications where weight savings are at a premium Magnesium alloys can also have greater creep resistance and superior elevated temperature specific tensile properties than those of Al However, the hexagonal crystal structure of magnesium severely limits its available slip systems and preferred orientations can develop during working processes, slip occurring predominantly on the basal planes which leads to their alignment parallel to the direction of metal flow As a geometric consequence of the c/a ratio of magnesium being less than ideal, twinning can theoretically only occur in compression, parallel to the basal planes, which would be expected to result in there being large asymmetries between the tensile and compressive yield stresses in textured wrought products The compressive yield stresses in wrought magnesium alloys have been previously found in forgings to the 06--07 times those of the tensile Such an asymmetric yield behavior, resulting in a poor compressive yield stress, would prohibit many potential applications for wrought Mg alloys The aim of this paper is to investigate how significant the problem of yieldmore » asymmetry can be in two typical high strength wrought Mg alloys, the Mg-Y-Nd mischmetal based alloy, WE54, and the Mg-Zn-Cu based alloy, ZC71« less