Abstract: An igniting agent includes a powder of a Mg.Al alloy containing Mg: 55 to 70 wt % and Al: the balance. At least one selected from the group consisting of Ca, Mn, Li, Si, Sb, Sr, Zn, Zr, Sc, Y, Sn, Ba, and rare earth metals may be added in an amount of 0.5 to 10 wt %. An initiator is loaded with the igniting agent. A gas generator incorporates the initiator. The igniting agent provides high ignition speed and good grindability.

Abstract: A magnesium alloy and a die casting produced from the alloy include an AZ91-based magnesium alloy including 6.0 to 11.0 percent by weight of aluminum, 0.1 to 2.5 percent by weight of zinc, 0.1 to 0.5 percent by weight of manganese, and strontium and at least one of calcium and antimony added in an amount sufficient to act as a grain refining agent.

Abstract: An object of the present invention is to provide an iron base Si--Mn alloy or an iron base Si--Mn--Ni alloy which can be easily crushed and can be manufactured in large quantity, and alloy powder thereof.An iron base Si--Mn--Ni alloy having good crushability and alloy powder thereof, comprising:C: 0.40 to 1.20% by weight,Si: 5.0 to 12.0% by weight,Mn: 19.0 to 42.0 % by weight, or Ni: not more than 30% by weight, and the balance being Fe, with the following equations satisfied: Si.gtoreq.11.89-2.92 C-0.077 Mn, Vickers hardness (Hv).gtoreq.550, and area ratio of dendrite structure .ltoreq.50%.An iron base Si--Mn--Ni alloy having good crushability and alloy powder thereof, comprising:C: 0.40 to 1.20% by weight,Si: 5.0 to 12.0% by weight,Mn: 19.0 to 42.0% by weight, or Ni: not more than 30% by weight, and the balance being Fe, with the following equations satisfied: Si.ltoreq.8.3 C+0.14 Mn, and relative permeability (.mu.).ltoreq.1.10.