(Ti-50%(原子分数)Al)-10%Al2O3粉体经过球磨的机械活化(MA)后,用放电等离子烧结(SPS)工艺,在烧结的同时进行固化.采用机械活化-放电等离子烧结(MA-SPS)的方法原位烧结制备TiAl-Al2O3块体纳米材料.球磨前后,(Ti-50%(原子分数)Al)-10%Al2O3粉体的衍射图(XRD)相似.MA后得到晶粒度＜25nm的纳米粉体,其中Al2O3起到机械活化和细化晶粒的作用,促使粉体快速纳米化.纳米粉体在温度低于800℃、烧结时间＜5min的烧结参数下,烧结成TiAl纳米合金.TiAl纳米合金的微观结构表明,合金有γ-TiAl和α2-Ti3Al双相组织.SPS原位烧结后,得到密度为3.73g/cm3的(γ+α2)双相组织,组成相的晶粒度＜130nm.
Powder of (Ti-50at%Al-10wt%Al2O3 was get through ball milling mechanical activation (MA), and then sintered and concurrently consolidated by using spark plasma sintering (SPS) process. TiAl-Al2O3 bulk nano-material was fabricated using the method of mechanical activation-spark plasma sintering (MA-SPS) in situ. The original and ball milled (Ti-50at% Al)10wt%Al2O3 showed similar X-ray diffraction profiles. After MA, the crystal sizes of nano-powder are less than 25nm. Al2O3 has effect of mechanical activation, while makes crystal fine and accelerates nano-process. The nano-powder was sintered into TiAl alloy on a temperature lower than 800℃, and for a sintering time less than 5min. The microstructure of TiAl alloy contains gamma TiAl and alpha-2 Ti3 Al phase. Through SPS in situ, the final nano-material has dual-phase (γ+ α2 ), and its density is 3.73g/cm3. The crystal sizes of dual-phase are less than 130nm.
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