ALLOY wheel rims are a composite or content of Aluminium, carbon and other alloys. Earlier the Alloy rims were made of a mix or Magnesium, but mag-alloy rims were flammable, so in the UK they had banned Mag-Alloy rims for racing. Well, I don’t know about Indian Rims and their content. I’ll get the report soon.
Nowadays in our bikes, we usually getting alloy wheel rims. Known for less weight, dependability and efficiency. The charm of spoke wheel is only you can see in Royal Enfield Products. Alloy wheels are very great for tubeless tyres because of sitting space of Tyre on the rim. The tyre fits perfectly and accurately on the rim in the periphery which is very much important, the improper fitting may cause the bike to start wobbling at the time of riding.
When a tubeless tyre gets punctured you don’t need to exclude the tyre from the rim and so there would be no loss to the rim. I would suggest to never put the tyre with tubes on alloy wheels unless you take care while supporting the tire because otherwise, you could be damaging the edges of the rim every time you remove and refit the tire. Those rims are relatively softer than other metals because as we know aluminum is very flexible and light material. So on the road, if you have a flat tyre than the regular puncture fellow would use his screw driver or some sort of Tommy bar which would always damage the rim. 
Alloy rims of Royal Enfield have got proper seat and edge to fix the tyre rather than conventional spoke wheel rim. And on popular wheel rims, you can’t place tubeless due to spoke holes which will leak all the air.
For alloy rims, there is a special tool which is available in the market. Well, not in India for sure. I ordered it from the USA because I do care and respect BIKES whether it belongs to me or my customer. The tools are costing hardly few $…(If anyone wants I can get it). It saves the rim edge for sure.

Alloy rims always need special attention:

Hold your Tyre air load as per company guidance to avoid damage. 
Use always a proper tool for removing and changing the Tyre.
Alloy rims on two wheeler also need dynamic balancing.
Do not use a hammer to remove the Tyre.
Do not use “under diameter” Tyre on the rim.
Try not to remove the Tyre from the rim when it is punctured.
Try to buy branded alloy rims, rather than any local rims. The mixture of the alloy is a complicated subject which in most cases the manufacturer takes care of. But if you are planning to produce alloys on your own, and if the mixture is wrong or the casting is wrong then you might endanger the lives of yours and others.
Do not buy mag-alloy rims.
Try withdrawing pot holes.
Do not ride your bike on off road. That may break the rim fast.
When you are buying a bike with alloy wheels. Regularly go for disc brake system. In alloys, if you take drum brake system then remember the drum is itself is a rim there is no separate drum. So when the drum will get damage or if the wear tear is high then you will have to buy full alloy rim. 
Try not to repair wheels at home if you are unknown to any auto parts.
Tubeless Tyre Puncture Removing Kit is possible in the market. Always keep it with you. You can visit my workshop, and I could teach you how to exclude a tubeless tyre Puncture.
Yes, Alloy wheels can be repaired. But I suspect we have any one who can fix it in India. If it’s a total loss then don’t try to fix it, because Rims are a matter of life or death, so don’t play with it.