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彈(dan)(dan)(dan)性(xing)(xing)(xing)合(he)(he)金(jin)是精 密(mi)合(he)(he)金(jin)的一類，用于(yu)制作精 密(mi)儀器儀表中(zhong)彈(dan)(dan)(dan)性(xing)(xing)(xing)敏(min)感(gan)元(yuan)件(jian)、儲能元(yuan)件(jian)和頻率元(yuan)件(jian)等彈(dan)(dan)(dan)性(xing)(xing)(xing)元(yuan)件(jian)。除了具(ju)有良好的彈(dan)(dan)(dan)性(xing)(xing)(xing)性(xing)(xing)(xing)能之 外，還(huan)具(ju)有無磁性(xing)(xing)(xing)、微(wei)塑性(xing)(xing)(xing)變形抗力(li)高(gao)(gao)、硬度高(gao)(gao)、 電阻(zu)率低(di)、彈(dan)(dan)(dan)性(xing)(xing)(xing)模(mo)量(liang)溫度系數小、內耗小等性(xing)(xing)(xing)能。 彈(dan)(dan)(dan)性(xing)(xing)(xing)合(he)(he)金(jin)包括高(gao)(gao)彈(dan)(dan)(dan)性(xing)(xing)(xing)合(he)(he)金(jin)和恒(heng)彈(dan)(dan)(dan)性(xing)(xing)(xing)合(he)(he)金(jin)。前者彈(dan)(dan)(dan)性(xing)(xing)(xing) 高(gao)(gao)，滯彈(dan)(dan)(dan)性(xing)(xing)(xing)效(xiao)應低(di)，耐(nai)熱性(xing)(xing)(xing)好;后者在(zai)一定(ding)溫 度范圍內彈(dan)(dan)(dan)性(xing)(xing)(xing)模(mo)量(liang)幾乎(hu)不隨溫度變化，又稱(cheng)為“艾 林瓦 (Elinvar) 合(he)(he)金(jin)”。彈(dan)(dan)(dan)性(xing)(xing)(xing)合(he)(he)金(jin)一般在(zai)真空(kong)中(zhong) 冶煉，半成品(pin)或(huo)成品(pin)亦多在(zai)真空(kong)或(huo)保(bao)護性(xing)(xing)(xing)氣氛中(zhong)進 行(xing)熱處理。