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The role of type Ia supernovae, mainly the Delay Time Distributions (DTDs)determined by the binary systems, and the yields of elements created bydifferent explosion mechanisms, are studied by using the {\sc MulChem} chemicalevolution model, applied to our Galaxy. We explored 15 DTDs, and 12 tables ofelemental yields produced by different SN Ia explosion mechanisms, doing atotal of 180 models. Chemical abundances for $\alpha$-elements (O, Mg, Si, S,Ca) and Fe derived from these models, are compared with recent observationaldata of $\alpha$-elements over Iron relative abundances, [X/Fe]. These datahave been compiled and binned in 13 datasets. By using a $\chi^2$-technique, nomodel is able to fit simultaneously these datasets. A model computed with the13 individual best models is good enough to reproduce them. Thus, a power lawwith a logarithmic slope $\sim -1.1$ and a delay in the range $\Delta \tau=40--350$ Myr is a possible DTD, but a combination of several channels is moreprobable. Results of this average model for other disc regions show a highdispersion, as observed, which might be explained by the stellar migration. Thedispersion might also come from a combination of DTDs or of explosion channels.The stellar migration joined to a combination of scenarios for SNIa is theprobable cause of the observed dispersion.

Chemical evolution models: the role of type Ia supernovae in the  $\alpha$-elements over Iron relative abundances and their variations in time  and space