【摘要】：為研究Cu-3.0Ni-0.75Si合金時(shí)效過程中沉淀相的析出與長(zhǎng)大規(guī)律,及其對(duì)合金硬度的影響,采用渦流電導(dǎo)儀和布氏硬度計(jì)分別測(cè)量合金的電導(dǎo)率和硬度,根據(jù)導(dǎo)電率與新相析出量之間的關(guān)系分析合金的時(shí)效析出動(dòng)力學(xué)過程.結(jié)果表明,在350℃下時(shí)效,合金硬度隨時(shí)效時(shí)間的延長(zhǎng),先升高后趨于平緩;在450℃、550℃下時(shí)效,合金硬度隨時(shí)效時(shí)間的增加快速上升,到達(dá)峰值后緩慢下降;時(shí)效溫度越高,合金硬度峰值越低,但硬度達(dá)到峰值所需的時(shí)間越短.溫度一定,隨時(shí)效時(shí)間的增加,合金電導(dǎo)率在時(shí)效初期快速升高,至峰值后趨于平緩.根據(jù)Cu-3.0Ni-0.75Si合金在450℃時(shí)效過程中電導(dǎo)率的變化,通過Avrami方程推導(dǎo)出相應(yīng)的相變動(dòng)力學(xué)方程及電導(dǎo)率方程分別為f=1-exp(-0.052 2t0.717 61)和σ=15.2+16.3[1-exp(-0.052 2t0.717 61)],采用相關(guān)系數(shù)檢驗(yàn)法及F檢驗(yàn)法對(duì)電導(dǎo)率方程的可信性進(jìn)行檢驗(yàn),結(jié)果說明時(shí)效析出動(dòng)力學(xué)方程和電導(dǎo)率方程具有一定的可靠性.對(duì)比由電導(dǎo)率經(jīng)驗(yàn)方程得出的電導(dǎo)率理論值與測(cè)量得出的實(shí)驗(yàn)值,該理論值與實(shí)驗(yàn)值有良好的吻合度.
[Abstract]:In order to study the precipitation and growth law of precipitated phase in Cu-3.0Ni-0.75Si alloy during aging, and its influence on the hardness of the alloy, the electrical conductivity and hardness of the alloy were measured by eddy current conductance meter and Brinell hardness meter, respectively. The aging precipitation kinetics of the alloy was analyzed according to the relationship between the conductivity and the precipitation amount of the new phase. The results show that at 350 鈩，

本文編號(hào)：2270953