Al-Mg cóimhiotal
Is iad seo a leanas tréithe feidhmíochta cóimhiotal alúmanaim Al{{0}Mg: dea-airíonna meicniúla ag teocht an tseomra; friotaíocht láidir creimeadh; droch-airíonna réitigh, luaineachtaí móra in airíonna meicniúla agus éifeachtaí tiús bhalla; úsáid fadtéarmach, plaisteacht an chóimhiotail de bharr titim in aois, agus tarlaíonn scoilteadh fiú i dteilgin dísle; is mó freisin an claonadh atá ag scoilteadh creimeadh strus i dteilgin bás. Rinne na míbhuntáistí a bhaineann le cóimhiotal Al{{2}Mg a chuid buntáistí a fhritháireamh go páirteach, rud a fhágann go bhfuil sé teoranta ó thaobh feidhme.
Al-Zn cóimhiotail
Al-Is féidir le teilgin dísle cóimhiotal alúmanaim Zn airíonna meicniúla níos airde a fháil tar éis aosaithe nádúrtha. Nuair a bhíonn mais codán de since níos mó ná 10 faoin gcéad, tá an neart feabhsaithe go suntasach. Is é míbhuntáiste an chóimhiotail seo ná droch-fhriotaíocht creimeadh, claonadh chun creimeadh strus, agus scoilteadh te éasca le linn bás-réitigh. Tá sreabhach maith ag an gcóimhiotal Y401 a úsáidtear go coitianta agus is furasta an cuas a líonadh. Is é an míbhuntáiste go bhfuil claonadh mór aige pores a fhoirmiú, agus nuair a bhíonn an t-ábhar sileacain agus iarann íseal, tá sé éasca a bheith scáinte te.
Al-Si cóimhiotail
Because Al-Si aluminum alloy has the characteristics of small crystallization temperature interval, large solidification latent heat of silicon phase in the alloy, large specific heat capacity, and relatively small linear shrinkage coefficient, its casting performance is generally better than other aluminum alloys. Its filling ability is also good, and the tendency of thermal cracking and shrinkage is relatively small. The Al-Si eutectic contains the least amount of brittle phase (silicon phase), and its mass fraction is only about 10 percent , so its plasticity is better than that of other aluminum alloy eutectic, and the remaining brittle phase can be further treated by modification. Improve plasticity. The test also shows that the Al-Si eutectic still maintains good plasticity at the temperature near its freezing point, which is not found in other aluminum alloys. There is often a considerable amount of eutectic in the cast alloy structure to ensure its good casting performance; the increase in the number of eutectic will make the alloy brittle and reduce the mechanical properties, there is a certain contradiction between the two. However, due to the good plasticity of Al-Si eutectic, it can better take into account the requirements of both mechanical properties and casting properties, so Al-Si alloy is currently the most widely used die-casting aluminum alloy.
