"Memory model" is also an academic term which (among other things) describes how memory behaves WRT to concurrent opreations, so I would not use it in this context.
Memory management is the correct term. Rust the language does not do any memory management: memory management is a feature of the standard library. I would say that the Rust standard library (the `alloc` crate specifically) provides types that safely encapsulate allocation and deallocation of memory.
This is enabled by automatic destructor calls on stack-allocated variables when they go out of scope. (However, note that destructors need not deallocate memory).
Again, this part works exactly the same in C++. In C++ when a type's constructor acquires some resource, and its destructor releases that resource (in this case the resource being memory) it is referred to as "Resource Acquisition Is Initialization" or RAII.
https://en.wikipedia.org/wiki/Memory_model_(programming)
