抄録
This is to report on the study of the effect of the boron treatment on the mechanical properties and electrical conductivity of Al-Mg-Si ternary alloy.
The fiindings are as follows:
(1) The addition of boron restored the decrement of electrical conductivity by titanium impurity contained in Al-Mg-Si alloy. In this case, same amount of boron to restore the electrical conductivity as titanium was added and that exceeded the amount of boron repuired at the reaction of Ti+2B_??_TiB2.
It might be due to the formation of more boron rich compound than TiB2 or of AlB2 compound from a part of boron.
(2) Boron itself did not improved the electrical conductivity of aluminium and its alloy free from titanium.
(3) Regarding the effect of boron on the aging characteristics of Al-Mg-Si alloy, it was found that the retrogressive temperature (Rückbildungs-temperatur) was raised about 10°C by the addition of boron. Therefore it could concluded that, aging at the temperature of 180°to 190°C, the electrical conductivity of Al-Mg-Si alloy treated with boron decreased more than that of boron free alloy.
(4) Sprit aging treatment had more undesirable effect on the mechanical properties and electrical conductivity of Al-Mg-Si alloy with or without boron than that of the material aged immediately after solution heat treatment.
