功能材料
功能材料
공능재료
JOURNAL OF FUNCTIONAL MATERIALS
2005年
11期
1794-1797
,共4页
机械活化(MA)%放电等离子烧结(SPS)%Ti-Al%纳米材料
機械活化(MA)%放電等離子燒結(SPS)%Ti-Al%納米材料
궤계활화(MA)%방전등리자소결(SPS)%Ti-Al%납미재료
mechanical activation(MA)%spark plasma sintering(SPS)%Ti-Al%nano-material
(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.
(Ti-50%(原子分數)Al)-10%Al2O3粉體經過毬磨的機械活化(MA)後,用放電等離子燒結(SPS)工藝,在燒結的同時進行固化.採用機械活化-放電等離子燒結(MA-SPS)的方法原位燒結製備TiAl-Al2O3塊體納米材料.毬磨前後,(Ti-50%(原子分數)Al)-10%Al2O3粉體的衍射圖(XRD)相似.MA後得到晶粒度<25nm的納米粉體,其中Al2O3起到機械活化和細化晶粒的作用,促使粉體快速納米化.納米粉體在溫度低于800℃、燒結時間<5min的燒結參數下,燒結成TiAl納米閤金.TiAl納米閤金的微觀結構錶明,閤金有γ-TiAl和α2-Ti3Al雙相組織.SPS原位燒結後,得到密度為3.73g/cm3的(γ+α2)雙相組織,組成相的晶粒度<130nm.
(Ti-50%(원자분수)Al)-10%Al2O3분체경과구마적궤계활화(MA)후,용방전등리자소결(SPS)공예,재소결적동시진행고화.채용궤계활화-방전등리자소결(MA-SPS)적방법원위소결제비TiAl-Al2O3괴체납미재료.구마전후,(Ti-50%(원자분수)Al)-10%Al2O3분체적연사도(XRD)상사.MA후득도정립도<25nm적납미분체,기중Al2O3기도궤계활화화세화정립적작용,촉사분체쾌속납미화.납미분체재온도저우800℃、소결시간<5min적소결삼수하,소결성TiAl납미합금.TiAl납미합금적미관결구표명,합금유γ-TiAl화α2-Ti3Al쌍상조직.SPS원위소결후,득도밀도위3.73g/cm3적(γ+α2)쌍상조직,조성상적정립도<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.