陕西科技大学学报(自然科学版)
陝西科技大學學報(自然科學版)
협서과기대학학보(자연과학판)
JOURNAL OF SHAANXI UNIVERSITY OF SCIENCE & TECHNOLOGY
2014年
2期
31-35
,共5页
王芬%樊宁霞%朱建锋%艾桃桃
王芬%樊寧霞%硃建鋒%艾桃桃
왕분%번저하%주건봉%애도도
Al2O3/TiAl%复合材料%La2O3掺杂%Fe2O3掺杂%原位合成%微观结构%力学性能
Al2O3/TiAl%複閤材料%La2O3摻雜%Fe2O3摻雜%原位閤成%微觀結構%力學性能
Al2O3/TiAl%복합재료%La2O3참잡%Fe2O3참잡%원위합성%미관결구%역학성능
Al2O3/TiAl%composite%La2O3 doping%Fe2O3 doping%in-situ reaction%micro-structure%mechanical properties
本研究采用 Ti-Al-TiO2-La2 O3体系,通过热压烧结工艺原位合成了Al2 O3/TiAl复合材料.借助X射线衍射(XRD)、扫描电镜(SEM )等分析研究了材料的物相组成和微观组织结构,同时分别将掺杂La2 O3和掺杂Fe2 O3对合成Al2 O3/TiAl复合材料微观结构和力学性能的影响进行了对比.结果表明:掺杂La2 O3合成的Al2 O3/TiAl复合材料基体尺寸相对掺杂Fe2 O3合成产物较小,分散更加均匀,致密度更高.当La2 O3掺杂量为3.93 w t%时,Al2 O3/T iA l复合材料的抗弯强度和断裂韧性达到最大值,分别为701.95 M Pa和7.79 M Pa · m1/2.由于稀土氧化物具有对基体和增强颗粒的净化,细化晶粒等作用,因此提高了 T iA l基体与Al2 O3增强颗粒结合强度,所以掺杂La2 O3合成材料的力学性能相比掺杂Fe2 O3合成的产物较高.
本研究採用 Ti-Al-TiO2-La2 O3體繫,通過熱壓燒結工藝原位閤成瞭Al2 O3/TiAl複閤材料.藉助X射線衍射(XRD)、掃描電鏡(SEM )等分析研究瞭材料的物相組成和微觀組織結構,同時分彆將摻雜La2 O3和摻雜Fe2 O3對閤成Al2 O3/TiAl複閤材料微觀結構和力學性能的影響進行瞭對比.結果錶明:摻雜La2 O3閤成的Al2 O3/TiAl複閤材料基體呎吋相對摻雜Fe2 O3閤成產物較小,分散更加均勻,緻密度更高.噹La2 O3摻雜量為3.93 w t%時,Al2 O3/T iA l複閤材料的抗彎彊度和斷裂韌性達到最大值,分彆為701.95 M Pa和7.79 M Pa · m1/2.由于稀土氧化物具有對基體和增彊顆粒的淨化,細化晶粒等作用,因此提高瞭 T iA l基體與Al2 O3增彊顆粒結閤彊度,所以摻雜La2 O3閤成材料的力學性能相比摻雜Fe2 O3閤成的產物較高.
본연구채용 Ti-Al-TiO2-La2 O3체계,통과열압소결공예원위합성료Al2 O3/TiAl복합재료.차조X사선연사(XRD)、소묘전경(SEM )등분석연구료재료적물상조성화미관조직결구,동시분별장참잡La2 O3화참잡Fe2 O3대합성Al2 O3/TiAl복합재료미관결구화역학성능적영향진행료대비.결과표명:참잡La2 O3합성적Al2 O3/TiAl복합재료기체척촌상대참잡Fe2 O3합성산물교소,분산경가균균,치밀도경고.당La2 O3참잡량위3.93 w t%시,Al2 O3/T iA l복합재료적항만강도화단렬인성체도최대치,분별위701.95 M Pa화7.79 M Pa · m1/2.유우희토양화물구유대기체화증강과립적정화,세화정립등작용,인차제고료 T iA l기체여Al2 O3증강과립결합강도,소이참잡La2 O3합성재료적역학성능상비참잡Fe2 O3합성적산물교고.
Al2O3/TiAl composites were successfully synthesized by hot pressing based on the TiAl-TiO2-La2O3 system .The phase composition and microstructure of composites were characterized by X-ray diffraction analysis (XRD) and scanning electron microscopy (SEM ) . The respective effects of La2O3 and Fe2O3 addition on microstructure and mechanical proper-ties of the prepared composites were also compared .The results indicate that ,in contrast to the Al2O3/TiAl composite with Fe2O3 addition ,the matrix grain size of the composite doped with La2O3 is smaller and the Al2O3 particles disperse more uniformly .Meanwhile ,the densi-ty of the latter is higher .When the La2O3 content is 3 .93 w t% ,the products possess the maximum value of 701 .95 MPa和7 .79 MPa · m1/2 for the flexural strength and fracture toughness ,respectively .The bonding strength of TiAl matrix and Al2O3 reinforced particles increases due to the clean-up effect of the rare earth oxide on the interface of the two phases .Consequently ,the composite doped with La2O3 addition has more optimal mechanical proper-ties than that with Fe2O3 addition .