Grain size-induced thermo-mechanical coupling in zirconium thin films

摘要: At the bulk scale, thermal conductivity of metals is not coupled with mechanical strain. However, this may be same for grain sizes below electron mean free path, which deformation mechanism and volume fraction boundaries are drastically different from bulk. To investigate hypothesis size-induced thermo-mechanical coupling, we developed an experimental setup to measure 100-nm-thick freestanding nanocrystalline zirconium (Zr) films as a function externally applied Experimental results show strong strain–thermal Zr film dropped 20 13 W m−1 K−1 increasing strain 0 1.24 %. Thermal was also measured average size ranging as-deposited 10 nm as-grown 250 nm. The clearly that above 10 nm, has no influence over conductivity, supports proposed hypothesis.