Composition dependence of elastic constants in wurtzite AlGaInN alloys

The Elastic Constants of Copper Alloys

The elastic constants of single crystals of dilute solutions of Al, Si, Zn, Ga and Ge in Gu have been determined by the ultrasonic pulse method. Alloying causes a decrease in all the fundamental constants, C^, (C-^-C]^)^ and (G11 2C^2)/3> the relative decrease in (Gi2~Gi2)/2 being the greatest. The changes in shear constants Cu, and (C,-,-C-,2)/2 have been interpreted in terms of the known elec...

Elastic constants of Ni-Mn-Ga magnetic shape memory alloys

We have measured the adiabatic second order elastic constants of two Ni-Mn-Ga magnetic shape memory crystals with different martensitic transition temperatures, using ultrasonic methods. The temperature dependence of the elastic constants has been followed across the ferromagnetic transition and down to the martensitic transition temperature. Within experimental errors no noticeable change in a...

Elastic constants of bcc Cu-Al-Ni alloys.

We have measured the adiabatic elastic constants of two Cu-Al-Ni martensitic alloys using ultrasonic methods and we have compared the results to recent neutron-scattering experiments. It is shown that the elastic behavior of Cu-Al-Ni alloys follows the same trends exhibited by other Cu-based alloys; in particular, the TA2 long-wavelength acoustic modes are softer than all other modes. Disciplin...

Dependence of Elastic Modulus on Microstructure in 2090-type Alloys

The Young's modulus, s h e a r modulus and P o i s s o n ' s r a t i o were d e t e r m i n e d u s i n g a n u l t r a s o n i c p u l s e e c h o t e c h n i q u e . T h r e e c o m m e r c i a l l y f a b r i c a t e d a l u m i n u m c o p p e r l i t h i u m a l l o y s and an aluminum-lithium binary a l l o y were examined. The e l a s t i c p rope r t i e s were measured a s a func t ion...

Ab initio elastic tensor of cubic Ti0.5Al0.5N alloys: Dependence of elastic constants on size and shape of the supercell model and their convergence