(鄭州大學(xué) 物理工程學(xué)院，材料物理教育部重點(diǎn)實(shí)驗(yàn)室，鄭州 450052)
摘 要: 采用電解低鈦鋁合金、 工業(yè)純鋁與Al-10Ti中間合金， 制備了具有不同鈦含量的電解加鈦A356合金（EA356 合金）和熔配加鈦A356合金（MA356合金）， 研究了加鈦方式和鈦含量對A356合金的應(yīng)變能密度和低周疲勞性能的影響。 結(jié)果表明： 4種合金均表現(xiàn)為明顯的循環(huán)硬化行為；具有較高鈦含量的E14、 M14合金的循環(huán)硬化能力高于低鈦含量的E10和M10合金； 合金的塑性應(yīng)變能密度受應(yīng)變幅的影響且具有循環(huán)相關(guān)性；高應(yīng)變幅時， 塑性應(yīng)變能較高但隨循環(huán)周次變化較小； 當(dāng)應(yīng)變幅較低時， 合金的塑性應(yīng)變能較小但變化較大， 特別是塑性較好的E10和M10合金； 無論是電解加鈦還是熔配加鈦， 鈦含量為0.1%的E10和M10合金的的塑性應(yīng)變能密度和疲勞壽命均優(yōu)于鈦含量為0.14%的E14和M14合金；合金的疲勞壽命對加鈦方式不敏感， 在相同鈦含量下， 兩種加鈦方式的合金具有相近的低周疲勞壽命。
關(guān)鍵字: A356合金； 循環(huán)硬化； 塑性應(yīng)變能密度； 疲勞壽命
plastic strain energy of A356 alloys
WANG Ming-xing, SONG Tian-fu
（ School of Physics Engineering, Key Laboratory of Material Physics，
Ministry of Education, Zhengzhou University, Zhengzhou 450052, China）
Abstract: Two kinds of EA356 alloys(adding titanium by electrolysis method) and MA356 alloys(adding titanium by melting Al-Ti master alloys), are produced by electrolytic low-titanium aluminum alloys, pure aluminum and Al-10%Ti master alloys respectively. The effects of titanium alloying method and titanium content on the plastic strain energy density and low-cycle fatigue behavior of A356 alloys were investigated. The results show that four kinds of A356 alloys show cycle hardening behavior. The cyclic hardening ability of alloys with high titanium content such as E14 and M14 alloys is higher than that of alloys with low titanium content such as E10 and M10 alloys. The values of plastic strain energy density are affected by the plastic strain amplitude and change with the cycle numbers. The values of plastic strain energy density are higher at high strain amplitude and the change with cycle number is less. But at low strain amplitude, its values are less and the change with cycle number is acute, especially for the alloys with low titanium content and low yield strength such as E10 and M10 alloys. Whether the EA356 alloys or MA356 alloys, the alloys with 0.1%Ti have higher plastic strain energy density and low cycle fatigue life compared with that of alloys with 0.14% Ti. The fatigue life is insensitive to the titanium alloying method. If alloys have the same titanium content, two kinds of alloys have similar low cycle fatigue life.
Key words: A356 alloys; cyclic hardening; plastic strain energy density; fatigue life
