(1. 上海交通大學(xué) 材料科學(xué)與工程學(xué)院， 上海 200030;
2. 南京大學(xué) 現(xiàn)代分析與測(cè)試中心， 南京 210093)
摘 要: Ti(50+x )Pd30Ni(20-x )合金在固溶處理之后存在2次相變，使用DSC，XRD，DMTA以及TEM等手段研究了這種相變。結(jié)果表明，低溫馬氏體為單斜的B19’相，而高溫母相則為體心立方的B2相，在相變過程中點(diǎn)陣的切變以正交的B19馬氏體相作為過渡。低溫馬氏體的彈性模量比高溫奧氏體的彈性模量高10GPa。隨著頻率減小，阻尼增大。在較高的頻率下，彈性模量曲線和阻尼曲線對(duì)于過渡相的存在反映不明顯。室溫下馬氏體為細(xì)狹的板條狀，當(dāng)溫度達(dá)773?K時(shí)，合金中有明顯的析出物產(chǎn)生。
關(guān)鍵字: 高溫形狀記憶合金； 相變； 彈性模量
Ti(50+x )Pd30Ni(20-x )alloys under different
heat treatment conditions
（1. School of Materials Science and Engineering，
Shanghai Jiaotong University， Shanghai 200030， P.R.China；
2. Modern Analysis and Measurement Centre， Nanjing University，
Nanjing 210093， P.R.China）
Abstract:A two-stage phase transformation has been observed in Ti rich Ti(50+x )Pd30Ni(20-x ) alloys under solution treatment ondition. DSC，XRD，DMTA and TEM were employed in the experiments. It is confirmed that the room temperature martensite is of monoclinic B19’structure，the high temperature austenite is of B2 structure，while B19 martensite acts as a media in the process of phase transformation. The elastic modulus of B19’martensite is 10 GPa higher than that of B2 phase. The damping properties decrease with the increase of vibration frequency. Long，thin martensite plate characterizes the microstructure of the alloys，when the specimen is heated to 773K，much precipitation occurs.
Key words: high-temperature shape memory alloy； phase transformation； elastic modulus
